Type 2390 and 2390B Liquid Level Transmitters - Home | …linearcontrols.net/intranet2/Fisher/Fisher/Manuals/D... · · 2017-07-19LIQUID LEVEL TRANSMITTER CAGED TYPE 249B SENSOR

D200364X012

Type 2390 and 2390B Liquid Level TransmittersContentsIntroduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scope of Manual 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Product Description 2. . . . . . . . . . . . . . . . . . . . . . . . . .Type 2390 and 2390B Transmitters 2. . . . . . . . . . . .249 Series Sensors 2. . . . . . . . . . . . . . . . . . . . . . . . .Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test Equipment and Tools Required 4. . .

Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pre-installation Requirements 6. . . . . . . . . . . . . . . . . .Direct or Reverse Action Setup Verification 6. . . . .Transmitter Orientation 6. . . . . . . . . . . . . . . . . . . . . . .Mounting the Transmitter on a 249 SeriesSensor 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting the Transmitter for High TemperatureApplications 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Precalibration Considerations 10. . . . . . . . . . . . . . . .Matching the Transmitter to a 249 SeriesSensor 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setup 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Coupling 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Zero and Span Adjustment 14. . . . . . . . . . . . . . . . .Recording the Sensor Span 14. . . . . . . . . . . . . . . .Securing the Unit for Shipment or

Placing the Unit In Service 14. . . . . . . . . . . . . . .Determining SuspendedWeight for Calibration 14. . . . . . . . . . . . . . . . . . . .

Dry Calibration 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Principle of Operation 17. . . . . . . . . . . . . . . . . . . .

Maintenance 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting 18. . . . . . . . . . . . . . . . . . . . . . . . . . .Checking Transmitter Hall-EffectSensor Assembly 20. . . . . . . . . . . . . . . . . . . . . . . .

Checking the Analog Output Meter 21. . . . . . . . . . .Removing the Transmitter from a249 Series Sensor 21. . . . . . . . . . . . . . . . . . . . . . .

249 Series Sensor in StandardTemperature Application 21. . . . . . . . . . . . . . . . .

249 Series Sensor in High TemperatureApplication 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1. Type 2390 or 2390B Liquid Level Transmitterand Typical Sensor

TYPE 2390 OR 2390B LIQUID LEVEL TRANSMITTER

W4078/IL

W4067-1*/IL

TYPE 2390 OR 2390BLIQUID LEVEL TRANSMITTER

CAGED TYPE 249B SENSOR

Printed Wiring Board Compartment PartsRemoval and Replacement 22. . . . . . . . . . . . . . .

Removing the Analog Output Meter 22. . . . . . . . . .Removing the Printed Wiring Board Assembly 22Removing a Potentiometer Assembly 22. . . . . . . .Removing and Re-installing the Transmitter

Hall-Effect Sensor Assembly 22. . . . . . . . . . . . .Re-installing a Potentiometer Assembly 22. . . . . .Re-installing a Printed Wiring Board Assembly 22Re-installing the Analog Output Meter 22. . . . . . . .

Instruction ManualForm 5233May 1999 Type 2390 and 2390B

Type 2390 and 2390B

2

Contents (Continued)Sensor Connection Compartment Parts Removaland Re-installation 23. . . . . . . . . . . . . . . . . . . . . . .

Removing the Lever Assembly 23. . . . . . . . . . . . . .Removing and Replacing the Flexure Strips 23. .Removing the Dry Span Scale 24. . . . . . . . . . . . . .Re-installing the Dry Span Scale 24. . . . . . . . . . . .Re-installing the Lever Assembly 24. . . . . . . . . . . .

Parts Ordering 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair Kits 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts List 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Type 2390 and 2390B Liquid LevelTransmitters 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .

249 Series Sensor Insulator Assembly 30. . . . . . . .

Introduction

Scope of ManualThis instruction manual provides installation, calibra-tion, maintenance, and parts ordering information forthe Type 2390 and 2390B liquid level transmittersused with the 249 Series level sensors. A typicaltransmitter-sensor combination is shown in figure 1.

Refer to the Principle of Operation section for a morecomprehensive discussion of how the Type 2390 and2390B liquid level transmitters operate.

Only personnel qualified through training or experienceshould install, operate, and maintain this transmitter. Ifthere are any questions concerning these instructionscontact your Fisher Controls sales office or sales rep-resentative before proceeding.

Note

This manual does not include sensorinstallation instructions, maintenanceinstructions, or parts lists. For this in-formation, refer to the appropriate sen-sor instruction manual.

Product Description

Type 2390 and 2390B TransmittersThe Type 2390 or 2390B liquid level transmitter isused with the 249 Series sensors to measure changesin liquid level, the level of interface between two liq-

Figure 2. Typical Nameplate

uids, or the specific gravity (density) changes of a liq-uid. These changes exert a buoyant force on the dis-placer, which rotates the torque tube shaft. This rotarymotion is applied to the transmitter, and the resultingcurrent output signal is sent to an indicating or finalcontrol element.

A wide variety of 249 Series sensors are used with theType 2390 or 2390B transmitters.

249 Series Sensors! The Type 249, 249B, 249BF, 249C, 249K, 249L,

and 249N sensors side-mount on the vessel with thedisplacer mounted inside a cage outside the vessel.(The Type 249BF is available only in Europe, MiddleEast, and Africa.) These sensors are called cagedsensors.

! The Type 249BP, 249CP, and 249P sensors top-mount on the vessel with the displacer hanging downinto the vessel. These sensors are called cagelesssensors.

! The Type 249V sensor side-mounts on the ves-sel with the displacer hanging out into the vessel(cageless sensor).

SpecificationsSpecifications for a Type 2390 or 2390B transmitterare listed in table 1. Some specifications for an individ-ual transmitter, as it comes from the factory, are foundon the nameplate (figure 2).

Type 2390 and 2390B

3

Table 1. Specifications

Transmitter Input Signal(1)

Liquid level, interface level, or density changesmove the displacer up or down to provide rotarymotion to the torque tube shaft

Transmitter Output Signal(1)

4 to 20 milliamperes (mA) dc (direct action—in-creasing input increases transmitter output; or re-verse action—increasing input decreases transmit-ter output)

Transmitter Performance (Transmitter Only)(Specific Gravity of 1.0)

Transmitter Output Reference Accuracy(1):!0.5% of full scale outputHysteresis(1): !0.1% of full scale outputRepeatability(1): !0.1% of full scale outputDry Span Calibration: !2.5% of full scale at a spe-cific gravity of 1.0Optional Analog Output Meter Accuracy: !2.5%of full scaleFrequency Response: A second order fit of thecombined torque tube and transmitter transfer func-tion is characterized by a natural frequency (!n) of3 radians/second and a damping ratio (") of 0.9.The −3 dB point (90" phase shift) occurs between0.4 and 0.5 Hz.

Transmitter Performance With 249 Series Sensor(2)(Specific Gravity of 1.0, Standard Torque Tube)

Independent Linearity(1): !0.75% of full scale out-putHysteresis(1): 0.4% of full scale output

Transmitter Operating Influences(1)

Electromagnetic Interference (EMI)(1):With trans-mitter covers on, product meets requirements ofSAMA standard PMC 33.1-1978; Class 3-abc out-put changes less than !0.5% of actual span whenoperated in an electromagnetic field strength of 30V/m [this is equivalent to a 5-watt, 20 to 1000 MHzradio transmitter operating 19 inches (0.5 m) fromthe level transmitter]Power Supply Effect: Output signal changes lessthan !0.002% of full scale output per 1.0 volt changein power supply voltage between 11 and 45 volts dc

Transmitter Power Supply Requirements(3)Figure 3

Standard Transmitter: 11 to 45 volts dc with re-verse polarity protection

CSA and SAA Certified or FM Approved Trans-mitter (2390): 11 to 30 volts dc for intrinsically safe or11 to 30 volts dc for flameproof unitsLCIE or PTB (CENELEC) Approved Transmitter(2390B): 11 to 32.5 volts dc for intrinsically safe(PTB) and 11 to 45 volts dc for flameproof (LCIE)units

Transmitter Span Adjustment10 to 100% of displacer length for level applicationsusing a standard volume displacer

Transmitter Zero Adjustment100% of displacer length

Transmitter Environmental ProtectionEnclosure ProtectionType 2390: Meets NEMA 4X, CSA Type 4X, andIP65 ratingsType 2390B: Meets EN 60529 IP66 ratingComplies with the European EMC directiveTransient Power Surge Protection: No damage fora line-to-line power surge of up to 100 kilowatts for100 nanoseconds, or 1.5 kilowatts for 1 millisecond

Transmitter Hazardous Area ClassificationRefer to the Hazardous Area Classifications bulle-tins for appropriate approvals

Transmitter Weight7.7 pounds (3.5 kg)

Standard Sensor Displacer VolumesType 249C, 249CP Displacers: 60 cubic inches(983 cm3)All Other Displacers: 100 cubic inches (1639 cm3)

Minimum Sensor Differential Specific Gravity0.1 with standard volume displacers

Mounting PositionsTransmitter may be right or left hand mounted onsensor. All level sensors with cage displacers have arotatable head. The head can be rotated through 360degrees to any of eight different positions as shown infigure 8

Caged Sensor Connection StylesCages can be furnished in a variety of end connec-tion styles to facilitate mounting on vessels; theequalizing connection styles are numbered and areshown in figure 4

−Continued−

Type 2390 and 2390B

4

Table 1. Specifications (continued)

Operating LimitsProcess Temperature: See table 3 and figure 11Ambient Temperature and Humidity: See below

Conditions NormalLimits(1)

Transportand StorageLimits(1)

NominalReference(1)

AmbientTemperature(1)

– 40 to 176"F(– 40 to 80"C)

– 58 to 176"F(– 50 to 80"C)

77"F(25"C)

AmbientRelative Humidity

10 to 95% 10 to 95% 40%

1. These terms are defined in ISA Standard S51.1-1979.2. Specific gravity of 1.0 on standard wall torque tube with full input change.3. All versions have reverse polarity protection.

Table 2. Additional Tools Required

TOOL COMPONENTTOOL SIZE FOR TYPE

2390 OR 2390B TRANSMITTERTOOL COMPONENTType 2390, Inches Type 2390B, mm

Hex nut driverAllen head wrenchOpen-end wrenchAllen head wrench

Shaft clampShipping screwCam disk assemblyHeat insulator

11/329/649/325/64

7372

Open-end wrenchOpen-end wrenchOpen-end wrench

Mounting hex nutsVent plugEccentric pin

1/215/163/16

13245

Allen head wrenchAllen head wrenchAllen head wrench

Flexure screwsLever assembly adjustmentEccentric pin lock

3/329/645/64

2.532

Allen head wrench Cover, CENELEC flameproof 5/64 2

Table 3. Allowable Process Temperatures for Common 249Sensor Component Materials

Process TemperatureMaterial

Min. Max.

Cast Iron −20"F (−29"C) 450"F (232"C)

Steel −20"F (−29"C) 800"F (427"C)

Stainless Steel −325"F (−198"C) 800"F (427"C)

N05500 (K-Monel) −325"F (−198"C) 700"F (371"C)

Graphite Laminate/SSTGaskets −325"F (−198"C) 800"F (427"C)

Monel/PTFE Gaskets −100"F (−73"C) 400"F (204"C)

Test Equipment and Tools RequiredThe following equipment is required for installation,calibration, and maintenance of the Type 2390 and2390B liquid level transmitters.

! Power supply capable of supplying up to 24 voltsdc in series with a load.

! A 4-digit digital voltmeter (DVM), with an imped-ance of at least 250,000 ohms, that measures volt-ages in the range of 0 to 10 volts dc with an accuracyof !1 millivolt, and currents in the range of 0 to 50 mAdc with an accuracy of !0.01 mA.

1011

15 20 25 30 35 40 4532.5

1700

1450

1250

1000

750

500

250

0

POWER SUPPLY VOLTAGE, V dc

LOADRESISTA

NCE,O

HMS

FOR A 4−20MILLIAMPERECIRCUIT,MAXIMUMALLOWABLELOADRESISTANCE IS1700 OHMS

CSA CERTIFIED ORFM APPROVEDTRANSMITTERSINTRINSICALLY-SAFE ANDFLAME-PROOF

STANDARD ANDLCIE (CENELEC)FLAME-PROOFTRANSMITTERS

PTB (CENELEC)INTRINSICALLY-SAFEAPPROVED TRANSMITTERS

Figure 3. Power Supply Requirements and Load Resistance

A3542-2 / IL

! Optionally, a 250 ohm, !0.1 percent, 1/2-wattresistor may be used for converting the 4−20 mAtransmitter signals to 1–5 volts dc for voltage mea-surements.

! General-purpose multimeter with an input imped-ance greater than 30,000 ohms per volt.

! An alignment tool (part number 1N10323 G012).

Type 2390 and 2390B

5

Figure 4. Style Number of Equalizing Connections

STYLE 1TOP AND BOTTOM CONNECTIONS,SCREWED (S-1) OR FLANGED (F-1)

STYLE 2TOP AND LOWER SIDE CONNECTIONS,SCREWED (S-2) OR FLANGED (F-2)

STYLE 3UPPER AND LOWER SIDE CONNECTIONS,

SCREWED (S-3) OR FLANGED (F-3)

STYLE 4UPPER SIDE AND BOTTOM CONNECTIONS,

SCREWED (S-4) OR FLANGED (F-4)27A0973-AB1820-1 / IL

! Refer to table 2 for additional tools required.

Refer to Repair Kits under Parts List in this instructionmanual for a tool kit for the Type 2390 transmitter.

Installation

WARNING

Personal injury or property damage dueto sudden release of pressure, contactwith hazardous fluid, fire, or explosioncan be caused by puncturing, heating,or repairing a displacer that is retainingprocess pressure or fluid. This dangermay not be readily apparent when disas-sembling the sensor or removing thedisplacer. Before disassembling thesensor or removing the displacer, ob-serve the appropriate warnings providedin the sensor instruction manual.

The Type 249 sensor is mounted using one of twomethods, depending on the specific type of sensor. Ifthe sensor has a caged displacer, it typically mountson the side of the vessel as shown in figure 5. If thesensor has a cageless displacer, the sensor mountson the side or top of the vessel as shown in figure 6.

Figure 5. Typical Caged Sensor Mounting

A3789/IL

The Type 2390 or 2390B transmitter is typicallyshipped attached to the sensor. If ordered separately,it may be convenient to mount the transmitter to thesensor and perform the matching and initial calibrationbefore installing the sensor on the vessel.

Type 2390 and 2390B

6

Figure 7. Printed Wiring Board Connections

2N10065-LA3544-2/il

A5497/IL

Figure 6. Typical Cageless Sensor MountingA3788/IL

Pre-installation Requirements

Note

Caged sensors have a rod and blockinstalled on each end of the displacer toprotect the displacer in shipping. Re-move these parts before installing thesensor to allow the displacer to functionproperly.

Check that you have received the proper HazardousArea Approval rating on the transmitter. The name-plate on the transmitter (figure 2) specifies the approv-al agency (if required) for the transmitter.

Direct or Reverse Action Set-UpVerificationBefore installing the transmitter, determine that theinstrument is set up properly for direct or reverse ac-tion. Direct action (increasing level produces an in-creasing output) or reverse action (increasing levelproduces a decreasing output) is set up as shown infigure 7, depending on whether the sensor is right- orleft-hand mounted. If your transmitter is set up incor-rectly, refer to the table in figure 7 before proceedingwith the installation. When changing action, the plugmust be rotated 180 degrees to insert it in the othersocket. (The wires from the plug exit toward the top ofthe transmitter when in J2 and toward the bottomwhen in J2.1, in order to engage the locking tangs onthe connectors.) On units with an output indicator, theindicator mounting screws may have to be loosened toallow easy access to the J2.1 socket.

Transmitter OrientationMount the transmitter with the vent opening pointingdownward to allow accumulated moisture drainage.The transmitter and torque tube arm are attached tothe displacer in either a right- or left-hand mountingstyle, as shown in figure 8. This can be changed in thefield on the 249 Series sensors (refer to the appropri-ate sensor instruction manual). Changing the mount-

Type 2390 and 2390B

7

Figure 8. Head Mounting Positions for 249 Series Caged Sensorwith Rotatable Head (Top View)

17A8552-AB1875-1/IL

17A8552-AB1874-1/IL

Type 2390 and 2390B

8

Figure 9. Sensor Connection Compartment

4N10233-DA3543-4/IL

COVER LOCKING SCREW(FLAME-PROOF TYPE 2390B ONLY)

LEVER ASSEMBLY ALIGNMENTADJUSTMENT

CAM-DISKASSEMBLYECCENTRIC PIN

ECCENTRIC PINLOCKING CAP SCREW

SHAFT CLAMP

VENT PLUG

ing style also changes the effective action, becausethe torque tube rotation for increasing level, (looking atthe protruding shaft), is clockwise in a right handmounted unit and counterclockwise in a left handmounted unit. See table in Figure 7 for required config-uration adjustment.

All caged 249 Series sensors have a rotatable head.That is, the transmitter can be positioned at any ofeight alternate positions around the cage as indicatedby the position numbers 1 through 8 in figure 8. Torotate the head, remove the head flange bolts andnuts and position the head as desired.

Mounting the Transmitter on a 249Series Sensor

Key numbers are referenced in figure 21 or 22 exceptwhere otherwise indicated.

1. Remove the vent plug (figure 9) and loosen theshaft clamp (figure 9) with a hex nut driver insertedthrough the vent plug hole.

2. Remove the hex nuts (key 62) from the mountingstuds (key 61).

CAUTION

Measurement errors can occur if thetorque tube assembly is bent or misa-ligned during installation.

3. Position the transmitter so the vent plug is on thebottom of the transmitter.

4. Carefully slide the mounting studs into the sensormounting holes until the transmitter is snug against thesensor.

5. Reinstall the hex nuts on the mounting studs andtighten the hex nuts to 88.5 lbf#in (10 N#m).

Mounting the Transmitter for HighTemperature ApplicationsKey numbers are shown in figure 10 except whereotherwise indicated.

The transmitter requires an insulator assembly whentemperatures exceed the limits shown in figure 11.

A torque tube shaft extension is required for a 249 Se-ries sensor when using an insulator assembly.

CAUTION

Measurement errors can occur if thesensor torque tube assembly is bent ormisaligned during installation.

1. For mounting a transmitter on a 249 Series sensor,secure the shaft extension (key 37) to the sensortorque tube shaft via the shaft coupling (key 36) andset screws (key 38), with the coupling centered asshown in figure 10.

2. Remove the vent plug (figure 9) and loosen theshaft clamp with the hex nut driver inserted throughthe vent plug hole.

3. Remove the hex nuts (key 62, figure 21 or 22) fromthe mounting studs (key 61, figure 21 or 22).

4. Position the insulator (key 35) on the transmitter,sliding the insulator straight over the mounting studs.

5. Re-install the four hex nuts on the mounting studsand tighten the nuts.

6. Carefully slide the transmitter with the attached in-sulator over the shaft coupling so that the vent plug ison the bottom of the transmitter.

7. Secure the transmitter and insulator to the torquetube arm with four cap screws (key 39).

8. Tighten the cap screws to 88.5 lbf#in (10 N#m).

Type 2390 and 2390B

9

MN2880020A7423-CB2707 / IL

Figure 10. Transmitter Mounting on Sensor in High Temperature Applications

SENSOR TRANSMITTER

HEAT INSULATORREQUIRED

Figure 11. Guidelines for Use of OptionalHeat Insulator Assembly

70

0 20 40 60 80 100 120 140 160

0 10 20−20 −10 30 40 50 60400

300

200

100

00

400

800

−325

AMBIENT TEMPERATURE ("C)

STANDARD TRANSMITTERAMBIENT TEMPERATURE ("F)

HEAT INSULATORREQUIRED

TOOHOT

NOTES:FOR PROCESS TEMPERATURES BELOW −20"F (−29"C) ANDABOVE 400"F (204"C) SENSOR MATERIALS MUST BEAPPROPRIATE FOR THE PROCESS — SEE TABLE 3.

PROCESSTEMPERATURE(C)

"

PROCESSTEMPERATURE(F)

"

39A4070-BA5494-1/IL

42580

−100

−200

176−20−40

−40 −30

TOOCOLD

1

1

2. IF AMBIENT DEW POINT IS ABOVE PROCESS TEMPERATURE, ICEFORMATION MIGHT CAUSE INSTRUMENT MALFUNCTION AND REDUCEINSULATOR EFFECTIVENESS.

NO HEAT INSULATOR NECESSARY

Wiring

WARNING

Personal injury or property damage canresult if a suitable conduit seal is notinstalled. For explosion-proof applica-tions, install the seal no more than 18inches (457 mm) from the transmitter.

WARNING

To avoid personal injury or propertydamage, the following special condi-

tions are applicable to the Type 2390Bwith LCIE approval of flameproof. Ifthere is a possibility that the tempera-ture of the surface to which the trans-mitter is mounted will exceed 70"C, thenthe autoignition temperature of the at-mosphere surrounding the transmittermust be at least 15"C greater than thesurface temperature, but not less than85"C. For example, a surface tempera-ture of 75"C would require that the at-mosphere have an autoignition tempera-ture of at least 90"C.

Note

For intrinsically safe applications, referto the loop schematics at the end of thismanual or to instructions supplied bythe barrier manufacturer.

The transmitter is normally powered by a 24-volt pow-er supply in series with a load. Figure 12 shows typicalfield wiring.

Wire the transmitter as follows:

1. Remove the field wiring compartment cover (key38, figure 21 or 22) from the housing (key 1, figure 21or 22). This compartment has two threaded openingsavailable for fittings.

Note

For European applications, the Type2390B can be wired with a conduit entryadapter or cable gland (key 42, figure22). Figure 12 shows typical field wiring.Be sure to follow all local codes and ap-provals.

Type 2390 and 2390B

10

Figure 12. Typical 2-Wire Analog Signal Conditioner Connections

+

-

SAFETYGROUND

+

-+ -LOAD

24 V DCPOWERSUPPLY

FIELD WIRING COMPARTMENT

2

1P

EARTHGROUND

TYPE 2390 STANDARD, FM APPROVED OR CSA CERTIFIED TRANSMITTERS

GND

+

-

+

-+ -LOAD

24 V DCPOWERSUPPLY

FIELD WIRING COMPARTMENT

2

1P

TYPE 2390B LCIE (CENELEC) FLAMEPROOF TRANSMITTERS

2

NOTES:CABLE IS NO. 14 TO 18 AWG (2.08 TO 0.82 mm2), SHIELDED, TWISTED PAIR WITH DRAIN WIRE.REFER TO NATIONAL AND LOCAL CODES FOR APPROPRIATE GROUNDING REQUIREMENTS.B1983-1/IL 2

1

2. Bring the field wiring into the transmitter via one ofthe two threaded openings. Rigid metal conduit is rec-ommended. Be sure to follow all local installationcodes and approvals.

3. Connect the wire from the positive power supplyterminal to the positive screw terminal on the terminalblock in the field wiring compartment. Connect thepositive load connection to the negative screw terminalin the field wiring compartment as shown in figure 12.Connect the wire from the negative power supply ter-minal to the negative load terminal to complete theloop.

WARNING

Personal injury or property damage canresult from the discharge of static elec-tricity. Connect a 14 AWG (2.08 mm2)ground strap between the transmitterand earth ground when flammable orhazardous gases are present. Refer tonational and local codes and standardsfor grounding requirements.

4. Connect the safety ground (seal the conduit open-ing) and the earth ground as shown in figure 12. Re-place and hand tighten the cover to the housing. Whenthe loop is ready for startup, apply power to the powersupply.

Calibration

Precalibration ConsiderationsA Type 2390 or 2390B transmitter must be matched toa specific Type 249 sensor and then calibrated withthat sensor to a specific process requirement. Thus,before a transmitter and sensor combination can beinstalled for use, matching and calibration must beperformed.

The matching procedure records the displacer/torquetube rotational span on the transmitter dry span scale.The scale is calibrated so that 0 to 100% representsthe nominal design span of 4.4 degrees. The sensitiv-ity of the system varies due to the wide assortmentand tolerances of torque tubes and displacer volumes.For standard combinations using water at 70"F (21"C)as the measured liquid, the value of the sensitivity willfall between 85 and 100%.

Type 2390 and 2390B

11

Matching is done at the factory, using water with aspecific gravity of 1, for transmitter/sensor combina-tions that are ordered together. Matching must bedone in the field when:

! the transmitter is ordered separately from thesensor,

! the transmitter is replaced in the field,

! any time the sensor or sensor parts (torque tubeor displacer) are replaced, or

! any time the transmitter is disconnected from thetorque tube.

Note

If the transmitter is disconnected fromthe torque tube, and none of the otherconditions listed occured, then only thecoupling steps of the matching proce-dure need to be performed.

One of two methods may be used to match the trans-mitter to the sensor:

! Wet Calibration—this method calibrates the in-strument by raising and lowering the fluid level whilethe displacer is in the fluid. This is the most accuratemethod.

! Calibration by Weights—this method may beused on the bench, the displacer is removed from thetorque tube. Here, computed weights are used to sim-ulate the combined displacer weight and buoyantforce.

If possible, the system should be coupled and cali-brated with the process fluids at the process tempera-ture. When this is impractical or unsafe, variousmeans may be employed to simulate actual processconditions.

If the process temperature is close to ambient condi-tions, simply suspend the displacer to appropriatedepths in a liquid having a specific gravity equal to thatof the process liquid. For a caged sensor, the liquidused can be poured into the cage. If necessary, watercan be used for matching in the shop. If water is used,compensation must be made for the difference be-tween the specific gravity of water and that of the pro-cess liquid by scaling the levels used by the fluid spe-cific gravity.

If the process temperature will be considerably differ-ent than the calibration temperature, the variation intorque tube spring rate with temperature must also beconsidered. (Ref. TM−18) In some cases calibrationby weights may be the only feasible means of simulat-

ing the actual process. The various compensations forspecific gravity and temperature are accounted for inthe calculation of calibration weights.

Once the instrument is matched to the sensor usingone of the two methods, you can use the Dry SpanScale system to rerange the instrument (change thezero and span). This method artificially drives the me-chanical input to the computed set points relative tothe nominal calibration supplied by the Wet Calibrationor Calibration by Weights methods. Therefore, dry cal-ibration can be performed only after the instrumenthas been matched to the sensor.

Note

A transmitter factory-mounted on a sen-sor is already matched and does not re-quire the matching procedure. Thematching is performed using water witha specific gravity of 1 or with appropri-ate weights, and the scale is marked atfull actual travel (span) and will be thelarger value on the appropriate scale.

Before starting the matching procedure, confirm thatthe transmitter is correctly set up and installed on thesensor as described in the “Installation” section.

Matching the Transmitter to a 249 SeriesSensorAll locations in this procedure are referenced in figure13 unless otherwise indicated. The transmitter shouldbe installed on the torque tube arm, with the shaftclamp (figure 9) loose.

Setup1. Loosen the door screw on the calibration door andopen the door.

2. Remove the red shipping screw.

Note

Place the shipping screw in the clip pro-vided in the calibration door for rein-stallation after completing the calibra-tion procedures if the unit is to bemoved.

3. Connect the transmitter to the test equipment perthe calibration setup (figure 14) and turn on the powersupply and DVM. Set the DVM to measure milliam-peres (mA).

Type 2390 and 2390B

12

ZEROPOTENTIOMETERADJUSTMENT SHAFT

Figure 13. Calibration Adjustments

SPANPOTENTIOMETERADJUSTMENT SHAFT

ZERO AND SPANPOTENTIOMETERADJUSTMENTCOVER

DRY SPANKNOB

SHIPPINGSCREW CLIP

RED SHIPPING SCREW

SCALEINDICATOR

HOLDINGPOSITION

SCALE SETSCREW

SPRING WIRE

HOLDINGPOSITION (USE ONLY WHENINSTALLING SHIPPINGSCREW)

POINTER

VENT PLUG

CALIBRATION DOOR

CALIBRATIONDOOR SCREW

W5073-2/IL

Figure 14. Transmitter Calibration Setup

A3545-2/IL

4. Verify that plug P2 is in the correct position for di-rect or reverse action as appropriate (figure 7).

5. Loosen the screw on the zero and span potentiom-eter adjustment cover and turn the cover to exposethe potentiometer adjustment shafts.

6. Turn the span potentiometer (marked ‘‘S’’) to its fullcounterclockwise position and then clockwise two fullturns.

CAUTION

The cam can be damaged if the dry spanknob is rotated in the incorrect direc-tion. Always rotate the dry span knobclockwise when moving away from theAUTO position. Rotate the dry spanknob counterclockwise when movingtoward the AUTO position.

7. Set the dry span scale in the center of its slip rangeas follows:

a. Loosen the set screw in the dry span knob.

b. Hold the dry span knob so that it can’t rotate.

c. With a free finger, slip the scale clockwise until itstops, then counterclockwise to the opposite stop,noting limits of travel.

d. Position the scale so that it is midway betweenthe two stops and hand tighten the set screw.

Coupling1. Turn the dry span knob to 0 percent using the ap-propriate right- or left-hand dry span scale.

Type 2390 and 2390B

13

2. Set the displacer to the lowest possible processcondition, (i.e. lowest water level or minimum specificgravity, highest temperature) or replace the displacerby the heaviest calibration weight.

Note

Interface or density applications withdisplacer/torque tube sized for a smalltotal change in specific gravity are de-signed to be operated with the displaceralways submerged. In these applica-tions, the torque rod is sometimes rest-ing on a stop while the displacer is dry.The torque tube does not begin to moveuntil a considerable amount of liquidhas covered the displacer. In this case,it is necessary to couple with the displa-cer submerged in the fluid with the low-est density and the highest processtemperature condition, or to an equiva-lent condition simulated with the calcu-lated weights,

3. Move the spring wire to the R holding position.

4. Remove the vent plug and insert the hex nut driverinto the hole and onto the torque tube shaft clamp nut.Tighten to a maximum torque of 18 lbf#in. (2.1 N#m).

5. Return the spring wire to its neutral (center)position.

Note

The spring wire must be in the neutral(center) position for operation in the au-tomatic mode.

6. Turn the dry span knob to the AUTO position.

7. Use the zero potentiometer (marked “Z”) to adjustthe output current as follows:

! For direct action: adjust the output current to4 mA.

! For reverse action: adjust the output current to20 mA.

8. Determine the point where the cam touches theeccentric pin by slowly turning the dry span knob untilthe output current begins to move off the zero value.

9. If the resulting dry span scale reading is within !5percent, go to step 19. If it is not, record the dry spanscale reading and proceed with the next step.

10. Loosen the torque tube shaft clamp nut.


12. Determine a new coupling position from thefollowing:

New coupling % = (−1) (dry span scale reading in step9)

Example: X% = (–1) (–10)X% = +10

Example: X% = (–1) (+7)X% = –7

13. Move the dry span knob to the new couplingposition.

14. Retighten the torque tube shaft clamp nut.

15. Return the spring wire to the neutral (center)position.

Note


16. Turn the dry span knob to the AUTO position.

17. Use the zero potentiometer (marked “Z”) to adjustthe output current as follows:

! For direct action: adjust the output current to4 mA

! For reverse action: adjust the output current to20 mA

18. Slowly turn the dry span knob until the output cur-rent reading barely begins to move off the zero value.

Note

If the transmitter has been precalibratedfor 4 to 20 mA output with reference to 0to 100% on the dry span scale, (a stand−alone transmitter is shipped in this con-dition), each dry span scale division in-dicates 1% of span. With this initialcondition, the dry span knob may be ro-tated till the output current is 1% ofspan (0.16 mA) inside the current rangelimit, then align the scale at the 1%mark.

Type 2390 and 2390B

14

19. Loosen the scale set screw.

Note

Firmly hold onto the dry span knobwhile turning the scale.

20. Slip the scale to indicate 0 percent without movingthe dry span knob. If you cannot get the scale to theappropriate mark, loosen the dry span knob set screw,re-center the scale, hand tighten the set screw, andreturn to step 9).

21. Hand Tighten the scale set screw.

22. Return the dry span knob to the AUTO position.

Zero and Span Adjustment1. Depending on the transmitter action, perform oneor the other of the following:

! For direct action: move the displacer to the low-est position (i.e., lowest water level or minimum specif-ic gravity, highest process temperature) or replace thedisplacer by the heaviest calibration weight.

! For Reverse Action: move the displacer to thedesired highest position (i.e., highest water level ormaximum specific gravity, lowest process tempera-ture) or replace the displacer by the lightest calibrationweight.

2. Adjust the output current to 4 mA with the zeropotentiometer.

3. Depending on the transmitter action, perform oneor the other of the following:

! For Direct Action: move the displacer to thehighest position (i.e., highest water level or maximumspecific gravity, lowest process temperature) or re-place the displacer by the lightest calibration weight.

! For Reverse Action: move the displacer to thelowest position (i.e., lowest water level or minimumspecific gravity, highest process temperature) or re-place the displacer by the heaviest calibration weight.

4. Adjust the output current to 20 mA with the spanpotentiometer.

5. Repeat steps 1 and 3 to verify calibration and trimvalues if necessary.

Recording the Sensor Span1. To record the sensor output span on the dry spanscale, first move the spring wire to the R holding posi-tion.

2. Turn the dry span knob until the current output is20 mA for direct action or 4 mA for reverse action.

3. Mark this position on the scale with a felt tip penand record the scale reading of the mark on a calibra-tion sticker inside the dry span door. (This markedspan position is used later in calibrating to specific ap-plication requirements).

4. Turn the dry span knob counterclockwise to theAUTO position.

5. Move the spring wire to the neutral (center)position.

Securing the Unit for Shipment or Placingthe Unit In Service1. If the system is to be moved without blocking thedisplacer before being placed in service (as in skidmounted systems), perform the following:

a. Uncouple the transmitter from the torque tubeand install the shipping screw. (The spring wiremay be hooked in the “L” position to facilitate en-gaging the shipping screw in the lever assemblythreads.)

b. Tag the calibration door with the appropriatewarning and indicate that the transmitter will needto be re-coupled before placing in service. (Whenre-coupling, the dry span scale mark will still becorrect after the zero is aligned with the dry displa-cer condition.)

2. If the system is being placed in service, or is beingmoved with the displacer blocked, the shipping screwshould be stored in the holding clip inside the door.

3. Close the calibration door and tighten the doorscrew.

4. Turn the zero and span potentiometer adjustmentcover back over the potentiometer adjustment screwsand tighten the cover screw.

Determining Suspended Weight forCalibration

CAUTION

To avoid overloading a torque tubesized for interface or density applica-tions under dry conditions, consult yourFisher sales office or sales representa-tive for the maximum allowable substi-tute weight Ws that can be used withyour particular construction.

To determine the total weight that must be suspendedfrom the displacer rod to simulate a certain condition

Type 2390 and 2390B

15

of process temperature, fluid level or specific gravity,solve the following equation:

Ws !"Wd # $%#w&(Vs)(SG)'(

[1# $(%T)]

where:

Ws = Total suspended weight in pounds (kilo-grams) [should never be less than 0.5 lbs(0.227 kg)].

Note

For liquid level control at standard tem-perature and pressure only, simulate thelower range limit of the input span byhanging the displacer on the displacerrod. For other values of process temper-ature or input span, remove the displac-er and suspend the appropriate weightas determined in the equation above.

$ = (% change in torque tube modulus per "F("C))/100% (Ref. TM-18 or call engineering)

%T = (Expected process temperature) − (tempera-ture of torque tube during calibration), in "F("C)

Wd = Weight of the displacer, in pounds (kilo-grams) [determine by weighing displacer].Note: for top-mounted sensors, also includethe weight of the displacer stem.

&w = Density of water (specific gravity = 1.0),0.0361 pounds per cubic inch (9.992 x 10−4kilograms per cubic centimeter)

Vs = Volume of the displacer, in cubic inches (cu-bic centimeters), that would be submerged atthe level required by the calibration proce-dure. '(/4 (displacer diameter)2 x (length ofdisplacer submerged)]

SG = Specific gravity of the process fluid at oper-ating temperature.

For interface level measurement, the equation be-comes:

Ws !"Wd # %#w&(V)[(hl)(SGl)) (hh)(SGh)](

[1# $(%T)]

where:

V = Volume of the displacer, in cubic inches (cu-bic centimeters). '(/4 (displacer diameter)2 x(length of displacer submerged)]

hl = Relative length of displacer that is immersedin the lighter fluid. [(length of the displacerimmersed in lighter fluid)/(length of the displa-cer)]

SGl = Specific gravity of the lighter fluid at operat-ing temperature.

hh = Relative length of displacer that is immersedin the heavier fluid. [(length of the displacerimmersed in heavier fluid)/(length of the dis-placer)]

SGh = Specific gravity of the heavier fluid at operat-ing temperature.

Dry CalibrationThe appropriate Matching the Transmitter to a 249Series Sensor procedure must have been completed,and its sensitivity recorded, before performing this pro-cedure. All locations referenced in this procedure areshown in figure 13 unless otherwise indicated.

Note

A transmitter factory-mounted on a sen-sor is already matched and does not re-quire the matching procedure. Thematching is performed at room tempera-ture using water with a specific gravityof 1 or with appropriate weights. Thescale is marked at full actual travel(span) and will be the larger value onthe appropriate scale. If other condi-tions are used in matching, they shouldbe indicated on a calibration sticker in-side the dry span door, If such is thecase, the following procedure will notbe applicable without modification

1. Loosen the screw on the calibration door and openthe door.

2. If the red shipping screw is installed (clamping thelever assembly) in the housing wall, remove it andstow it in the clip on the door. The transmitter is mostlikely uncoupled from the torque tube. In this case,perform the Coupling steps of the Matching the Trans-mitter to a 249 Series Sensor procedure before pro-

Type 2390 and 2390B

16

ceeding. To confirm that the unit is coupled, observethat the spring wire moves as the displacer is lifted

Note

Place the shipping screw in the clip pro-vided in the calibration door for re-installation after completing the calibra-tion procedures if the unit is to bemoved.

3. Connect the transmitter to the test equipment perthe calibration setup (figure 14) and turn on the powersupply and the DVM.


5. Loosen the screw on the zero and span potentiom-eter adjustment cover plate and turn the cover plate toexpose the adjustments.

Note

The span control pivots the outputtransfer characteristic around the 4 mAoutput point. For this reason, the 4 mAoutput point is adjusted first with thezero control, for both direct and reverseaction.

6. Steps 7 through 12 of this procedure are brokeninto two parts, one for level applications and one forinterface level or density measurement. Perform oneor the other of steps 7 through 12 depending upon theapplication

Dry Calibration for Level Applications (Steps 7through 12)

7. Determine the calculated dry span scale setting(PBprocess) required for 100% level calibration point byusing the following formula:

PBprocess = (SGprocess) x (PBwater)

where:

SGprocess = specific gravity of process fluid

PBwater = recorded or marked dry span scale valuefrom the wet calibration procedure (equiva-lent to the mechanical proportional band of

the torque tube when using water at ambi-ent conditions as the process fluid)


! For direct action, turn the dry span knob to 0percent on the appropriate scale.

! For reverse action, turn the dry span knob tothe calculated 100% scale setting on the appropriatescale.

9. Adjust the zero potentiometer until the output cur-rent is 4 mA.


! For direct action, turn the dry span knob to thecalculated 100% scale setting on the appropriatescale.

! For reverse action, turn the dry span knob to 0percent on the appropriate scale.

11. Adjust the span potentiometer until the output cur-rent is 20 mA.

12. Proceed to step 13.

Dry Calibration for Interface Level or DensityMeasurement Applications (Steps 7 through 12)

7. If the transmitter was initially coupled at dry displa-cer condition and marked with SG = 1.0, compute the0% and 100% dry span scale settings for the dry spanscale as follows:

0% scale setting = (SGmin) x (PBwater)

100% scale setting = (SGmax) x (PBwater)

where:

SGmin = lowest specific gravity for density or specif-ic gravity of top phase for interface.

SGmax = highest specific gravity for density or spe-cific gravity of bottom phase for interface

PBwater = recorded or marked dry span scale valuefrom the wet calibration procedure (equiv-alent to the mechanical proportional bandof the torque tube when using water atambient conditions as the process fluid)

Type 2390 and 2390B

17

Note

Normal factory matching procedure isdone with a specific gravity of 1.0. If aspecific gravity other than 1.0 was usedin the factory matching procedure, orthe transmitter was coupled at otherthan dry displacer condition, the zeroand span settings for the dry span scaleand the associated SG values are shownon a label (key 171) on the inside sur-face of the calibration door. In this case,use the values on the label to confirmthe calibration, rather than the formulashown above. The rated accuracy of thedry span scale is only 2.5% of 4.4 de-grees and the resolution is about 1% of4.4 degrees, so its usefulness is limitedat low proportional band settings.


! For direct action, turn the dry span knob to 0%on the appropriate scale.

! For reverse action, turn the dry span knob tothe calculated 100% scale setting on the appropriatescale.

9. Adjust the zero potentiometer until the output cur-rent is 4 mA.


! For direct action, turn the dry span knob to thecalculated 100% scale setting on the appropriatescale.

! For reverse action, turn the dry span knob to0% on the appropriate scale.

11. Adjust the span potentiometer until the output cur-rent is 20 mA.

12. Proceed to step 13.

Dry Calibration Continued (Steps 13 through 17)

13. Move the spring wire to the neutral (center)position.

Note


14. Turn the dry span scale to the AUTO position.

Figure 15. Typical Sensor Operation

TORQUETUBE

DISPLACER

249 SERIES (SIDE VIEW)

W1389-1*/IL

15. Remove the test equipment.

16. Close the calibration door and tighten the doorscrew.

17. Turn the zero and span potentiometer adjustmentcover back over the adjustment shafts and tighten themachine screw.

Principle of OperationA level, density, or interface level change in the mea-sured fluid causes a change in the displacer position(figure 15). This change is transferred to the torquetube assembly. As the measured fluid changes, thetorque tube assembly rotates up to 4.4 degrees for a249 Series sensor, varying the transmitter output be-tween 4 and 20 mA. This conversion is described inthe following paragraphs and shown in the block dia-gram (figure 16).

The rotary motion is transferred to the transmitter le-ver assembly (via a bellows) supported by flexurestrips. The rotary motion moves a magnet attached tothe lever assembly, changing the magnetic field that issensed by the Hall-effect position sensor. The sensorthen converts the magnetic field signal to an electronicsignal.

The electronic signal is ambient-temperature-compen-sated and amplified by the differential amplifier. Thesignal is then linearized to compensate for the nonlin-earity of the magnetic field. The first and second-order

Type 2390 and 2390B

18

Figure 16. Block Diagram of Type 2390 and 2390B Transmitter OperationSK588B1842-1/IL

low pass filters dampen the effects of process turbu-lence and prevent saturation of the dc amplifier andthe current driver. The dc amplifier provides noninter-acting zero and span adjustments.

The current driver circuit develops a 4 to 20 mA cur-rent output signal proportional to the dc amplifier volt-age output. The voltage regulator provides stable sup-ply voltages for the transmitter circuits under varyingoperating conditions.

Circuits within the transmitter provide reverse polarityprotection, transient power surge protection, and elec-tromagnetic interference (EMI) protection.

Maintenance

WARNING

To avoid personal injury due to fire orexplosion, remove electrical power be-fore removing the transmitter in a haz-ardous area. Do not apply power to thetransmitter, with the covers removed,while in a hazardous area.

TroubleshootingPrior to reading the following text, go through the cal-ibration section and check the items as described inthe Precalibration Considerations procedure. An im-

properly set up transmitter can be the source of theproblem. If recalibrating does not clear up the problem,proceed with this section.

Key numbers are shown in figure 21 or 22 unlessotherwise indicated.

1. Isolate the problem to the sensor or transmitter.Set up the transmitter as if to do the calibration proce-dure shown in figure 14. Then slowly move the dis-placer up and down by changing the liquid level. Theoutput should follow the change in liquid level.

2. If there is no change in output in step 1, open thecalibration door (key 4) and carefully observe themovement of the spring wire on the lever assembly(figure 9) while changing the liquid level. If movementcannot be detected:

a. Remove the vent plug (figure 9) and loosen theshaft clamp (figure 9) on the lever assembly (key12) with the hex nut driver inserted through thevent plug hole.

b. Manually move the spring wire (figure 13) upand down and observe the output. If there is nooutput or an abnormal output is observed the mal-function is in the transmitter. Further troubleshoot-ing of the transmitter can be done by following table4 and figure 17, or the transmitter can be returnedto the factory for repair. If a 0 to 100 percent outputcan be obtained by moving the spring wire, thetransmitter is functional and the problem lies witheither the torque tube shaft coupling or the displac-er of the sensor. Consult the appropriate Type 249sensor instruction manual for further instructions onthe sensor.

Type 2390 and 2390B

19

Fig

ure

17.S

chem

atic

Dia

gram

ofT

ype

2390

and

2390

B4

to20

mA

Tra

nsm

itter

3N10061-G/IL

Type 2390 and 2390B

20

Table 4. Troubleshooting GuideSymptom Possible Cause Check Corrective Action

1. No output Incorrectly wired Wiring Wire correctly

2. Output is below 3.2 mA dc Incorrect supply voltage orexcessive field wiring resistance

Voltage at field terminals should bebetween 11 and 45volts dc

Check power supply voltageand total field wiring resistanceagainst figure 3.

Sensor assembly failure Sensor assembly by performingthe Checking Transmitter SensorAssembly procedure

Replace sensor assembly

3. Output is constant at 3.2 or30 mA dc



Open zero or span potentiometeror wiring harness

Confirm resistance for zero andspan potentiometers (20K ohms),continuity, solder joints, andconnector crimps of harness

Replace potentiometers orrepair wiring harness

4. Lever assembly magnetmovement across Hall sensor doesnot change output signal



Printed wiring board failure Sensor assembly checks OK andmagnet has not beendemagnetized.

Replace printed wiring board

5. Output drifting or erraticon bench at constant temperature

Printed wiring board failure orsensor failure

Replace parts successively toisolate problem

Replace faulty part

After any disconnection or troubleshooting, recalibratethe transmitter using the Matching the Transmitter to a249 Series Sensor procedure before putting it backinto operation.

Checking Transmitter Hall-Effect SensorAssembly

Key numbers are shown in figure 21 or 22 unlessotherwise indicated.

1. Remove the printed wiring board housing cover(key 2) from the transmitter.

2. Remove the analog output meter (key 16), ifinstalled, as described in the Removing the AnalogOutput meter procedure.

3. Apply +24 volts dc to transmitter (via field wiring).

4. Disconnect the Hall-effect sensor assembly plugP2 (figure 7) from the printed wiring board and connectit to the DVM [+ to yellow (pin 1) and − to green(pin 2)] .

5. Center the dry span scale in its slip range per step7 of the Matching the Transmitter to a 249 Series Sen-sor, Setup procedure.

6. Move the spring wire to the R holding position(figure 13).

7. Observe the output of the sensor on the DVM whileslowly rotating the dry span knob from 0 to 100 per-cent on the R scale. The DVM reading should be pro-portional to rotation, as follows:

+47 !8 mV at the 0% extreme0 !7 mV at the 50% position, and

−47 !8 mV at the 100% position

8. If the output does not change with rotation, thesensor assembly is not functioning properly. Proceedto step 10.

9. If the output varies but is not within the abovespecifications, the lever assembly may be damaged orout of alignment. Inspect the lever assembly for dam-aged or loose flexures, failed bonds on bellows joints,magnet damage, etc. Make any required repairs, orreplace with a lever assembly that is known to be ingood condition. Perform the Reinstalling the Lever As-sembly procedure in the “Maintenance” section of thismanual. Then repeat the troubleshooting tests. If theoutput is still not within specification, proceed tostep 10. If the output is within specification, proceedto step 12.

10. Turn the power supply off and measure the resist-ance between pins 1 and 2 of the sensor output plugP2. If the reading is not between 900 and 1200 ohms,replace the sensor assembly (key 11). If the resist-ance is within specification, proceed to step 11.

11. Disconnect plug P1 (figure 7) from the printed wir-ing board and measure between its pins (blue and redwires). If the reading is not between 900 and 1200

Type 2390 and 2390B

21

ohms, replace the sensor assembly. If the resistanceis within specifications, proceed to step 12.

12. Connect a milliammeter between pins 1(+)and 2(−) on the printed wiring board connector J1.

13. Turn the power supply on.

14. The current should be between 2.08 and 2.12 mAat 70"F (21"C). [If measured at −40"F (−40"C), thecurrent should be approximately 0.05 mA lower thanthe 70"F (21"C) value. At +176"F (80"C), the currentshould be approximately 0.05 mA higher than the70"F (21"C) value.]

15. If the current meets specification but the sensoroutput is not within the ranges given in step 7 for100% span (4.4 degree rotation of the input shaft), thesensor assembly sensitivity is non-standard and itmust be replaced.

16. To replace the sensor, see Removing the PrintedWiring Board Assembly and Removing and Re-Instal-ling the Transmitter Sensor Assembly.

Checking the Analog Output MeterThe analog output meter resistance should be approxi-mately 3.5 ohms.

Removing the Transmitter from a 249Series Sensor

CAUTION

Take special care during removal of thetransmitter from the 249 Series sensor.Bending or side-loading of the sensortorque tube assembly could cause er-rors in measurement on re-installation.

249 Series Sensor in StandardTemperature Application

Key numbers are referenced in figure 21 or 22 exceptwhere otherwise indicated.

1. Remove the vent plug (figure 9) and loosen theshaft clamp (figure 9) on the lever assembly (key 12)

with the hex nut driver inserted through the vent plughole.

2. Turn the dry span scale to the auto position andmove the spring wire to the L position to make re-installing the shipping screw easier.

3. Re-install the red shipping screw (key 57) that wasremoved in the “Installation” or “Calibration” section.

4. Loosen and remove the hex nuts (key 62) from themounting studs (key 61).

5. Carefully pull the transmitter straight off the sensortorque tube.

6. When re-installing the transmitter, follow the ap-propriate procedure outlined in the “Installation” sec-tion.

249 Series Sensor in High TemperatureApplication

Key numbers are shown in figure 10 except whereotherwise indicated.

1. Remove the vent plug (figure 9) and loosen theshaft clamp (figure 9) on the lever assembly (key 12,figure 21 or 22) with the hex nut driver insertedthrough the vent plug hole.

2. Turn the dry span scale to the auto position andmove the spring wire to the L position to make re-installing the shipping screw easier.

3. Re-install the red shipping screw (key 57, figure 21or 22) that was removed in the “Installation” or “Cal-ibration” section.

4. Loosen and remove the cap screws (key 39).

5. Carefully pull the transmitter straight off the torquetube shaft or torque tube shaft extension (key 37).

6. Loosen and remove the hex nuts (key 62, figure 21or 22) from the mounting studs (key 61, figure 21or 22).

7. Pull the heat insulator (key 35) off the mountingstuds.

8. When re-installing the transmitter, follow the ap-propriate procedure outlined in the “Installation” sec-tion.

Type 2390 and 2390B

22

Printed Wiring Board CompartmentParts Removal and Replacement

CAUTION

Electrostatic voltages present in thefield environment and transferred to theprinted wiring board can cause failureor degraded performance. Use appropri-ate antistatic procedures any time theprinted wiring board housing cover isremoved.

Key numbers are shown in figure 21 or 22 exceptwhere otherwise indicated.

Removing the Analog Output Meter

1. Disconnect power.

2. Unscrew and remove the printed wiring boardhousing cover (key 222).

3. Unscrew the two machine screws (key 18).

4. Disconnect connector plug P5 from board connec-tion J5 (figure 7).

5. Remove the entire output meter assembly (key 16)from the housing (key 1).

Removing the Printed Wiring BoardAssembly

1. Disconnect connector plugs P1, P2, P3, P4, P6,and P7 from board connections J1, J2 or J2.1, J3, J4,J6, and J7 respectively (figure 7).

2. Remove the three machine screws (key 20).

3. Carefully remove the printed wiring board (key 64)from the housing (key 1).

Removing a Potentiometer Assembly

1. Loosen the hex nut on the potentiometer assemblyuntil the threads are disengaged.

2. Pull the potentiometer (key 27 or 28) and shaft cou-pling (key 25) slowly and carefully off of the potentiom-eter shaft extension (key 22) with a twisting motion.

Removing and Re-installing theTransmitter Hall-Effect Sensor Assembly1. Remove the two machine screws (key 167).

2. Slide the sensor assembly (key 11) out of the hous-ing (key 1).

3. To re-install, slide the O-ring (key 10) over the sen-sor assembly.

4. Slide the Hall-effect sensor assembly into thehousing.

5. Insert the two screws (key 167) and alternatelytighten.

Re-installing a Potentiometer Assembly1. The potentiometer assembly comes with the shaftcoupling (key 25) installed on the potentiometer(key 27 or 28). Slip the shaft coupling (key 25) overthe potentiometer shaft extension (key 22).

2. Unscrew the hex nut on the potentiometer bushinguntil it is near the end of the bushing. Insert the poten-tiometer assembly (keys 27 or 28) into the bracket andsnugly tighten the hex nut.

Re-installing a Printed Wiring BoardAssembly

CAUTION

To avoid damaging wiring that can inter-rupt transmitter operation when the ana-log output meter and printed wiringboard are installed, verify that wires arerouted around the posts and throughthe notch in the printed wiring board asshown in figure 18.

1. Route the Hall-effect sensor wires as shown infigure 18.

2. Insert the printed wiring board assembly (key 64)into the housing (key 1).

3. Tighten the three machine screws (key 21).

4. Reconnect connector plugs P1, P2, P3, P4, P6,and P7 to board connections J1, J2 or J2.l, J3, J4, J6,and J7 respectively as identified in figure 7.

Re-installing the Analog Output Meter

CAUTION

To avoid damaging wiring that can inter-rupt transmitter operation, verify that

Type 2390 and 2390B

23

Figure 18. Hall-Effect Sensor Wire Routing

WIRES MUST NOT CROSS THIS EDGE OF SENSOR FLANGETO PREVENT CUTTING WHEN METER IS INSTALLEDAMPLIFIER

PWB

RED &BLUEWIRES

SENSORASSEMBLY

GREEN &YELLOWWIRES

POST

ANALOG METERLOCATION

17B0679-A / DOC

wires are not pinched between the out-put meter assembly and the printed wir-ing board when installing the outputmeter. A notch in the meter hole is pro-vided for wires to pass through theprinted wiring board.

1. Insert the output meter assembly (key 16) into thehole in the printed wiring board (key 64).

2. Connect connector plug P5 to the board connectionJ5 (figure 7).

3. Position the aperture (key 17) over the meter,insert the machine screws (key 18) through the apera-ture and output meter mounting holes and tightensnugly.

4. Screw the printed wiring board housing cover(key 222) snugly onto the housing (key 1).

Sensor Connection Compartment PartsRemoval and Re-installation

Remove the transmitter from the 249 Series sensor asdescribed in the Removing the Transmitter from a 249Series Sensor procedure.

Key numbers are shown in figure 21 or 22 exceptwhere otherwise indicated.

Removing the Lever Assembly

1. Remove the nuts (key 62) and slide the adapterring (key 3) off the housing and mounting studs(keys 1 and 61).

2. Remove the two funnel plate machine screws(key 19) and funnel plate (key 45).

3. Loosen and remove the red shipping screw(key 57) if installed.

Note

Place the shipping screw in the clip pro-vided on the calibration door for re-installation after completing the calibra-tion procedures if the unit is to bemoved.

4. Loosen and remove the two cap screws (key 20).

5. Pull the lever assembly (key 12) gently out of thehousing.

6. Inspect the flexure strips (key 85, figure 23) to seeif they are in any way bent or damaged. If they aredamaged, replace as described in the following proce-dure.

Removing and Replacing the FlexureStripsKey numbers are shown in figure 23 except whereotherwise indicated.

Remove the lever assembly as described in the pre-vious procedure.

1. Position the alignment tool as shown in figure 19,step 1.

2. Insert the alignment tool guides into the holes onthe bracket assembly as shown in figure 19, step 2.

3. While firmly grasping the alignment tool, removethe cap screws (key 89), washer plate (key 93), andthe flexure strips (key 85) from the lever assembly.

CAUTION

Hold the alignment tool firmly when re-placing flexure strips to prevent pos-sible bending or stressing that couldcause inaccurate operation.

4. Carefully position the new flexure strips and theninsert the washers, plates and cap screws. Lightlysnug the cap screws to hold the flexure strips in posi-tion.

Type 2390 and 2390B

24

Figure 19. Removing and Reinstalling Flexure Strips

NOTE:MAINTAIN CONSTANT PRESSURE ON ALIGNMENT TOOL ANDLEVER ASSEMBLY DURING REMOVAL AND REINSTALLATION.

STEP 1—ALIGNMENT TOOL POSITIONEDSTEP 2—ALIGNMENT TOOL IN PLACE

W5605/IL W5604/IL

FLEXURESTRIP

FLEXURESTRIPCAP SCREWS

WASHERSTRIP

ALIGNMENTTOOL

5. Tighten the cap screws at the solid end of the flex-ure, then alternately tighten all the cap screws to9 lbf#in (1 N#m).

6. Remove the alignment tool.

Removing the Dry Span ScaleKey numbers are shown in figure 21 or 22 exceptwhere otherwise indicated.

1. Loosen the door screw on the calibration door(figure 13) and open the door.

2. Loosen the scale set screw (figure 13) on the dryspan knob with a screwdriver.

3. Put a 9/32 inch or a 7 mm wrench on the cam diskassembly shaft nut (key 46) and hold firmly. The scalecan also be removed by inserting a small rod throughthe aligned hole in the dial and housing.

4. Turn the dry span knob counterclockwise and re-move the knob, pointer, and scale (keys 50, 49,and 48) from the shaft.

Re-installing the Dry Span Scale1. Put the dry span scale over the shaft with theproper scale orientation (figure 20).

2. Put the pointer over the shaft and screw the knobclockwise loosely onto the cam disk assembly shaft.

3. Put a 9/32 inch (7 mm) wrench on the shaft nut andhold firmly. The scale can also be assembled by in-serting a small rod through the aligned hole in the dialand housing.

4. Tighten the dry span knob.

5. Set the dry span scale to its middle position(figure 20) in reference to the scale adjustment stop.

6. Tighten the scale set screw on the dry span knobwith a screwdriver.

Re-installing the Lever AssemblyKey numbers are shown in figure 21 or 22 exceptwhere otherwise indicated.

1. Insert the lever assembly (key 12) into its mountingposition.

Type 2390 and 2390B

25

Figure 20. Transmitter Dry Span Scale

SPRING WIRE

SCALE ADJUSTMENT STOP

PIN

CAM

DUAL SCALE SHOWN WITH KNOB AND POINTER IN PLACESPRING WIRE IS IN NEUTRAL (CENTER) POSITION

DUAL SCALE SHOWN WITH KNOB ANDPOINTER REMOVED

W5602-1/IL W5603-1/IL

2. Insert and tighten the two cap screws (key 20).

3. Carefully move the lever assembly back and forthover the sensor assembly (key 11). There should beno touching or restriction of free travel.

4. Connect the transmitter test equipment per the set-up shown in figure 14 and turn on the power supplyand DVM.

5. Measure the output from the unconnected A or Bconnector (figure 7). If the reading is 0 (zero) !13mVdc, go to step 8. If the reading is not within the !13mVdc limits, continue with the following step.

Note

The transmitter should be in the mount-ing position with the vent plug on thebottom.

6. Loosen the cap screws (key 20) slightly and insertan Allen wrench in the lever assembly adjustmenthole.

7. Turn the wrench to move the lever assembly untilthe output is 0 (zero) !13 mVdc. Retighten the leverassembly mounting screws.

8. Move the spring wire to the R holding position(figure 20).

9. Loosen the scale set screw (figure 13) and slip thescale to its approximate middle position. The scale canbe rotated approximately 7 dry span scale divisionsfrom center in either direction.

10. Tighten the scale set screw.

11. Set the dry span scale to 50% on the scale.

12. Loosen the locking cap screw (key 92, figure 23)with a 5/64 inch (2 mm) Allen wrench.

13. Adjust the eccentric pin (key 91, figure 23) untilthe output voltage equals 0 (zero) !1 mVdc.

14. Tighten the locking cap screw (key 92, figure 23).

15. Return spring wire to the neutral (center) position.

Type 2390 and 2390B

26

Note

To recheck, turn the scale to the AUTOposition and confirm the 0 (zero) !13mVdc (millivolts dc) Hall-effect sensoroutput. If the output is 30 mVdc orgreater, the flexure strips may be dam-aged and require replacement. Thetransmitter should be in the mountingposition with vent plug on the bottom.

16. Re-install the funnel plate.

17. Re-install the funnel plate screws and tighten.

18. Slide the adapter ring onto the mounting studs.

19. Re-install the transmitter according to the ap-propriate Installation procedures.

20. Recalibrate the transmitter as described in the“Calibration” section.

Parts OrderingWhen corresponding with the Fisher Controls salesoffice or sales representative about this equipment,always mention the transmitter serial number. Whenordering replacement parts, refer to the part number ofeach required part as found in the following parts lists.

Repair KitsFlexure strips for Type 249(includes four of key 85) R2390 X00032Cover O-rings (includes keys 8 and 9) R2390 X00022Alignment Tool 1N10323 G012Tool Kit (Type 2390) 5N10477 X012

Parts List

Type 2390 and 2390B Liquid LevelTransmitters (figures 21, 22, and 23)Key Description Part Number1 Housing, A03600 aluminum alloy casting

The housing is not field replacable. Send the unitto a Fisher service center for housing replacement.

3 Adaptor Ring, A03600 aluminum alloy casting 1N10160 G0128* O-Ring, nitrile 1V3657 X00129* O-Ring, nitrile 1N10121 G01210* O-Ring, nitrile 1F1139 G0012

Key Description Part Number11* Sensor Assembly, stainless steel 1N10074 G02212* Lever Assembly, aluminum

Type 2390 (inch) 2N10086 X012Type 2390B (metric) 2N10086 X022

15 Set Screw, stainless steel (not shown)Used with flameproofType 2390B only, 1N10110 G012

16* Analog Output Meter Assembly, 4−20 mA 1N10111 G012

17 Aperture (used with meter only), aluminum 1N10117 G01218 Machine Screw (used with meter only)

Stainless steel (2 req’d)Type 2390 1N10313 G012Type 2390B 1N10312 G012

19 Machine Screw, stainless steelType 2390 (3 req’d) 1N10183 G012Type 2390B (4 req’d) 1N10364 G012

20 Cap Screw, stainless steel (2 req’d)Type 2390 1N10307 G012Type 2390B 1N10306 G012

21 Machine Screw, stainless steel (4 req’d)Type 2390 1N10185 G012Type 2390B 1N10119 G012

22 Potentiometer Shaft ExtensionStainless steel (2 req’d) 1N10122 G012

23 O-Ring, nitrile (2 req’d) 1H2926 G001224 Cover Plate, aluminum 1N10123 G012

25* Potentiometer Shaft Coupling,silicone rubber (2 req’d) 1N10124 G012

27* Potentiometer Assembly (Zero), includes key 2520K ohm (R28)For Type 2390 or intrinsically safe 2390B 1N10126 G012For 2390B w/LCIE flameproof approval 1N10126 G022

28* Potentiometer Assembly (Span), includes key 2520K ohm (R35)For Type 2390 or intrinsically safe 2390B 1N10319 G012For 2390B w/LCIE flameproof approval 1N10319 G022

30 Wire Assembly, copper (red wire) 1N10199 G01231 Wire Assembly, copper (blue wire) 1N10199 G02232 Wire Assembly (2 req’d), copper (black wire)

Type 2390 1N10194 G012Type 2390B 1N10135 G012

33 Barrier Strip,Type 2390 1H2904 06992Type 2390Bflameproof 1N10243 G022Intrinsically safe 1N10243 G012

34 Polarity MarkerType 2390, fiber (+ and −) 1H3105 06992Type 2390B, plastic (+) 1N10245 G012

35 Polarity MarkerType 2390B only, plastic (−) 1N10246 G012

36 Twist GuardType 2390B only 1N10244 G012

37 Wire Retainer (internal earthing terminal)Type 2390, zinc pl steel 16A2821 X012Flameproof 2390B, nickel pl brass 1N10136 G012Not used on intrinsically safe 2390B − − −

41 Nameplate42 Screwed Gland, plastic

Intrinsically safe Type 2390B only 11B3870 X012

* Recommended spare part.

Type 2390 and 2390B

27

Figure 21. Type 2390 Transmitter Assembly

4N10228-M/ DOCAPPLY LUB/SEALANT

Type 2390 and 2390B

28

Figure 22. Type 2390B Transmitter Assembly

4N10059-R/D

OC

Type 2390 and 2390B

29

Figure 23. Type 2390 or 2390B Lever Assembly

2N10086-K / DOC

A

A

APPLY EPOXYVIEW A-A

Key Description Part Number43 Plug

For Type 2390, stainless steel, 1A3692 X0462For intrinsically safe Type 2390B, plastic 12B0912 X012For Flameproof 2390B, stainless steel 12B1547 X012

44* Vent Plug, plastic 1N10142 G01245 Funnel Plate, stainless steel 1N10143 G012

46 Cam Disk Assembly, stainless steel 1N10144 X01247 Disk, stainless steel 1N10147 X01248* Scale, aluminum 2N10148 X01249 Pointer, polycarbonate 1N10149 G012

50 Knob, aluminumType 2390 1N10188 G012Type 2390B 1N10150 G012

51 Straight Pin, stainless steel 1N10151 X01253 Disk Spring, stainless steel 1N10378 G01254* Gasket, nitrile 1N10156 G01255 Hinge Pin, stainless steel 1N10157 G01256 Machine Screw, stainless steel

Type 2390 1N10190 G012Type 2390B 1N10158 G012

57 Red Shipping Screw, stainless steelType 2390 1N10191 G012Type 2390B 1N10159 G012

59 Clamping SaddleType 2390B only 18B3951 X012

60 Spring Washer, stainless steelType 2390 (2 req’d) 610006 10X12Type 2390B (3 req’d) 610006 10X12

61 Stud, stainless steel (4 req’d)Type 2390 1N10192 G012Type 2390B 1N10162 G012

62 Hex Nut, stainless steel (4 req’d)Type 2390 1E9440 X0352Type 2390B 1N10252 G012

Key Description Part Number63 Retaining Ring, stainless steel (2 req’d) 1N10163 G01264* Printed Wiring Board Assembly

4 to 20 milliamperes 2N10065 G01266 Certificate

Intrinsically safe (PTB, EEx ia) 1N10062 G012Flameproof (LCIE, EEx d) 11B4663 X022

67 Adhesive, Loctite 430(not furnished with the transmitter)

68 Lubricant, Lubriplate Mag-1(not furnished with the transmitter)

70 Thread Lock, Loctite 242(not furnished with the transmitter)

85* Flexure Strip for Type 249,stainless steel (2 req’d)Order the flexure strip repair kit, (see Repair Kits)

89 Cap Screw, stainless steel (8 req’d)Type 2390 1H2905 G0012Type 2390B 1N10256 G012

91 Eccentric Pin 1N10654 G01292 Cap Screw, 18-8 stainless steel

Type 2390 1N10669 X012Type 2390B 1N10668 X012

93 Strip, stainless steel (4 req’d) 1N10330 G01294 Spring Wire 1N10168 G022154 Machine Screw, stainless steel (2 req’d)

Type 2390 only 1P4743 X0012155 Lock Washer, stainless steel (2 req’d)

Type 2390 only 6100058 0X12158 Warning Label 1N10318 G012161 Cable Tie 1N10310 G012167 Machine Screw, stainless steel (2 req’d)

Type 2390 1N10375 G012Type 2390B 1N10374 G012

*Recommended spare parts

Type 2390 and 2390B

30

Key Description Part Number170 Hex Socket Wrench,

For flameproof Type 2390B only 1N10455 G012171 Label, Calibration (not shown)

(use only when specified) 1N10459 G012172 Plain Washer, stainless steel 1N10492 G012216 Lock Washer,

Type 2390B only 1H3137 28992217 Machine Screw,

Type 2390B only 13B8766 X012219 Adhesive, epoxy (ITW Devcon)

(not furnished with transmitter)221 Terminal Cover Assembly

Type 2390 & intrinsically safe 2390B 17B0672 X012Flameproof Type 2390B 17B0673 X012

222 End Cover Ass’yw/analog output meterType 2390 24B7343 X012Intrinsically safe 2390B 24B7390 X012Flameproof 2390B 21B4665 X012w/o analog output meterType 2390 & intrinsically save 2390B 11B2460 X022Flameproof 2390B 24B8008 X012

Key Description Part Number223 Dry Span Door Ass’y, includes key 54 17B0678 X012227 Wire Retainer, znpl steel (external earthing terminal)

Type 2390 only 17B7757 X012

249 Series Sensor Insulator Assembly(figure 10)35 Insulator, 304 stainless steel 22A0033 X01236 Shaft Coupling, 303 stainless steel 1A5779 3503237 Shaft Extension, N05500 nickel alloy 1B6815 4002238 Set Screw, stainless steel (2 req’d) 1E6234 X0022

39 Cap Screw, plated steel (4 req’d) 1A3816 K0012

Loop SchematicsThis section includes loop schematics required for wir-ing of intrinsically safe installations. If you have anyquestions, contact your Fisher Controls sales repre-sentative or sales office.

27A1473-C Sheet 1 of 2/DOC

Type 2390 and 2390B

31

27A1473-C Sheet 2 of 2/DOC

29A5848-F/DOC

Type 2390 and 2390B

32

20B2577-B Sheet 2 of 2/DOC

20B2577-B Sheet 1 of 2/DOC

For information, contact Fisher Controls:Marshalltown, Iowa 50158 USACernay 68700 FranceSao Paulo 05424 BrazilSingapore 128461

Printed in U.S.A.

$Fisher Controls International, Inc. 1985, 1999; All Rights ReservedFisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, expressor implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

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Type 2390 and 2390B Liquid Level Transmitters - Home | …linearcontrols.net/intranet2/Fisher/Fisher/Manuals/D... · · 2017-07-19LIQUID LEVEL TRANSMITTER CAGED TYPE 249B SENSOR