Hazardous AreaZirconia Oxygen Systems

Interface Electronics Unit

Installation GuideIM/EXFG–INT_6

ABB

The Company

We are an established world force in the design and manufacture of instrumentation for industrialprocess control, flow measurement, gas and liquid analysis and environmental applications.

As a part of ABB, a world leader in process automation technology, we offer customersapplication expertise, service and support worldwide.

We are committed to teamwork, high quality manufacturing, advanced technology and unrivalledservice and support.

The quality, accuracy and performance of the Company’s products result from over 100 yearsexperience, combined with a continuous program of innovative design and development toincorporate the latest technology.

The UKAS Calibration Laboratory No. 0255 is just one of the ten flow calibration plants operatedby the Company, and is indicative of our dedication to quality and accuracy.

Electrical Safety

This equipment complies with the requirements of CEI/IEC 61010-1:2001-2 'Safety Requirements for Electrical Equipment forMeasurement, Control and Laboratory Use'. If the equipment is used in a manner NOT specified by the Company, the protectionprovided by the equipment may be impaired.

Symbols

One or more of the following symbols may appear on the equipment labelling:

Health and SafetyTo ensure that our products are safe and without risk to health, the following points must be noted:

1. The relevant sections of these instructions must be read carefully before proceeding.

2. Warning labels on containers and packages must be observed.

3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with theinformation given.

4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressure and/or temperature.

5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry. Normal safe handling proceduresmust be used.

6. When disposing of chemicals ensure that no two chemicals are mixed.

Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may beobtained from the Company address on the back cover, together with servicing and spares information.

Warning – Refer to the manual for instructions

Caution – Risk of electric shock

Protective earth (ground) terminal

Earth (ground) terminal

Direct current supply only

Alternating current supply only

Both direct and alternating current supply

The equipment is protectedthrough double insulation

Information in this manual is intended only to assist our customers in the efficient operation of our equipment. Use of this manual forany other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval of theTechnical Publications Department.

EN ISO 9001:2000

Cert. No. Q05907

EN 29001 (ISO 9001)

Lenno, Italy – Cert. No. 9/90A

0255

Stonehouse, U.K.

1

PROBE������� Part No.

IM/EXFG–PB

SPECIFICATION SHEETFull Specification�

Part No.SS/EXFG

Certification

Product Identification

Mechanical Installation

Electrical Connections

Operation

Calibration

Fault Finding

TRANSMITTERProduct Identification

Mechanical Installation

Electrical Connections

Controls & Displays

Operation

Programming

������

Part No.IM/EXFG–4600

INTERFACE UNITCertification

Product Identification

Mechanical Installation

Electrical Installation

System Calibration

Fault Finding

������

Part No.IM/EXFG–INT

and

4680

4685

CONTENTS 1 INTRODUCTION

1.1 Documentation – Fig. 1.1Documentation for the EXFG Oxygen Analyzer System is shownin Fig. 1.1.

1.2 CertificationThe EXFG Interface Electronics Unit is certified to the ATEXDirective and CENELEC Standards BS EN50014 and BSEN50018 flameproof II 2G EExd IIB T6 (Tamb –20ºC to +50ºC).Baseefa03ATEX0385.

Certificates are available for inspection and/or copies can beobtained on application to the Company.

Fig. 1.1 System Documentation

Section Page

1 INTRODUCTION ........................................................... 11.1 Documentation ................................................... 11.2 Certification ........................................................ 11.3 System Overview................................................ 2

2 PREPARATION ............................................................. 32.1 Checking the Code Number ............................... 3

3 MECHANICAL INSTALLATION .................................... 43.1 Siting Requirements ........................................... 43.2 Mounting ............................................................ 5

4 ELECTRICAL INSTALLATION ...................................... 64.1 Conduit/Cable and Gland Specifications ............ 6

4.1.1 EXFG Interface Electronics Unitto EXFG Probe ...................................... 6

4.1.2 EXFG Interface Electronics Unitto EXFG 4600 Transmitter Unit ............. 7

4.2 Access to Terminals ........................................... 74.3 Conduit and Cable Connections ........................ 8

4.3.1 Single Conduit Connections ................. 84.3.2 Dual Conduit Connections .................... 94.3.3 Dual Cable Connections ..................... 10

4.4 Selecting the Mains Voltage ............................. 114.5 Re-sealing the Cover after Connection ............. 124.6 Switching Power On ......................................... 12

5 SYSTEM CALIBRATION ............................................. 135.1 Tools Required ................................................. 135.2 Access to the Zero and Span Controls ............ 13

6 FAULT FINDING.......................................................... 16

2

NON HAZARDOUS AREAHAZARDOUS AREA(ATEX Zone 1, Gas Group IIB)

Process20C to600C1.1 Bar

AbsoluteMaximum(40in WG)

EXFG ProbeATEX/CENELEC flameproofII 2G EEx d IIB T3 (Tamb –20C to +55C)BS EN50014 and BS EN50018

Mains Supply

Control ThermocoupleSignal

4 to 20mA Output Signal(25% to 0.25% O2)

or

4680 Transmitter

Mains Supply

Interface Electronics UnitATEX/CENELEC flameproof II 2G EEx d IIB T6

(Tamb –20C to +50C) BS EN50014 and BS EN50018

Flue

4685 Transmitter

RetransmissionOutput

Reference Air Line Entry

O2 mV Signal(–20 to +180mV)

or

LogicAlarmSignal

1.1 BarAbsolute Maximum

Dry, Oil-freeInstrument Air(10 bar max.)

ControlledHeaterSupply

Over-temperatureTrip Thermocouple

Test GasInlet

RegulatedReference Air Unit

(003000241)

…1 INTRODUCTION

1.3 System Overview – Fig. 1.2The EXFG Interface Electronics Unit is an explosion-proof, wall mounted device designed specifically for use with EXFG OxygenProbes.

It can be sited in an area in which explosive atmospheres are present in quantities that require special precautions for the constructionand use of electrical apparatus.

The unit provides temperature control for the EXFG probe heater and incorporates a fail-safe over-temperature trip. It also convertsmillivolt signals received from the EXFG probe zirconia cell (25% to 0.25% O2)

into a 4 to 20mA output signal for retransmission to a4680 or 4685 Series Transmitter. In addition, the unit is fitted with over-temperature and under-temperature alarm contacts whichrelate to fault conditions.

Span/zero calibration controls located at the side of the casting can be accessed and adjusted without infringing the flameproofintegrity of the unit.

Fig. 1.2 System Schematic

3

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GAS

ATMOSPHERE IS PRESENT

See Table 2.1 for unit code number

EXFG/0 0 0 X X X

tinUscinortcelEecafretnIGFXE 000/GFXE X X X

scinortcelEecafretnI enoNeborPGFXEroF

01

ylppuSsniaM enoNzH06/05V032zH06/05V511

012

smralA enoN)rettimsnarT0064tuohtiwdesufi(0064enoN

)cigoL(0064

012

2 PREPARATION2 PREPARATION

2.1 Checking the Code Number – Fig. 2.1

Fig. 2.1 Checking the Code Number

Table. 2.1 Code Number Interpretation

4

C – Within Environmental LimitsB – Within Temperature Limits

A – Maximum Distance of EXFG Interface Electronics Unit to EXFG Probe

50CMax.

–20CMin.ATMOSPHERE IS PRESENTDO NOT OPEN WHEN FLAMMABLE

IP66ATMOSPHERE IS PRESENT

DO NOT OPEN WHEN FLAMMABLE (NEMA 4X)

Maximum distance19.69 to 32.81ft (6 to 10m)with single or dual conduit

Up to 328.1ft (100m) with special dual cables ATMOSPHERE IS PRESENT

DO NOT OPEN WHEN FLAMMABLE

3 MECHANICAL INSTALLATION

Caution. 50C is the certified maximum ambient temperature.

Fig. 3.1 Siting Requirements

3.1 Siting Requirements – Fig. 3.1

Caution. When siting the EXFG Interface Electronics Unit choose a location free from excessive vibration.

5

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GAS ATMOSPHERE IS PRESENT

Drill suitable holes

Fix instrument to wall usingsuitable fixings (1/2in. or M12)

Mark fixing centers(see Fig. 3.2)

3

2

1

16.14 (410)

14.37(365)

6.02(153)

6.69(170)

14.96 (380)

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GAS

ATMOSPHERE IS PRESENT

2.56(65)

2.19(55.5)

11.81 (300)Min. Distance

2.56(65)

2.19(55.5)

(for door clearance)

Dimensions in inches (mm)

3 MECHANICAL INSTALLATION

3.2 Mounting – Figs. 3.2 and 3.3

Warning. Installation and repair must be carried out only by the manufacturer, authorized agents or persons conversant withthe construction standards for hazardous area certified equipment.

Fig. 3.2 Overall Dimensions

Fig. 3.3 Mounting

Note. Mount the unit at a level which allows easyaccess for connection and disconnection.

6

4 ELECTRICAL INSTALLATION

Warning. Before making any connections, ensure that the power supply, any high voltage-operated control circuits and highcommon mode voltages are switched off.

4.1 Conduit/Cable and Gland Specifications

4.1.1 EXFG Interface Electronics Unit to EXFG ProbeRefer to Table 4.1 for conduit, special cable and gland specifications.

Caution.• Installation and repair must be carried out only by the manufacturer, authorized agents or persons conversant with the

construction standards for hazardous area certified equipment. The specifications detailed in Table 4.1 are for systemelectrical requirements only.

• All cables must be suitable for flameproof 'd' type enclosures for mechanical construction.

• EEx d glands used on the Interface Electronics Unit must be of the EEx d 'Barrier Gland' type (because the enclosure isover 2 litres volume).

Table 4.1 Conduit/Cable and Gland Specifications – EXFG Interface Electronics Unit to EXFG Probe

rewopdnalangisdenibmoc–tiudnoCelgniS

htgnel)m6(tf86.91 dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf52Mhtiwdettifylbmessatiudnocrewop/langiS)0600/GFXE.ontrap(

ro

htgnel)m01(tf18.23 dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf52Mhtiwdettifylbmessatiudnocrewop/langiS)1600/GFXE.ontrap(

rewopdnalangisetarapes–tiudnoClauD

htgnel)m6(tf86.91dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf52MhtiwdettifylbmessatiudnoclangiS

)2600/GFXE.ontrap(

dna

dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf02Mhtiwdettifylbmessatiudnocrewop)3600/GFXE.ontrap(

ro

htgnel)m01(tf18.23dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf52MhtiwdettifylbmessatiudnoclangiS

)4600/GFXE.ontrap(

dna

dnehcaesdnalgreirrabdxEEdeifitrecfoorpemalf02Mhtiwdettifylbmessatiudnocrewop)5600/GFXE.ontrap(

rewopdnalangisetarapes–elbaClauD

redroothtgneL))m001(tf1.823htgnelmumixam(

deifitrecfoorpemalf52Mhtiwdeilppus)4910/GFXE.ontrap(deruomraeriw-leets,elbaclangislaicepS)47211B.ontrap(dnehcaerofsdnalgreirrabdxEE

dna

02Mhtiwdeilppus)5910/GFXE.ontrap(eroc-3,deneercsdnaderuomraeriw-leets,elbacrewoplaiceps)57211B.ontrap(dnehcaerofsdnalgreirrabdxEEdeifitrecfoorpemalf

Single Conduit, Dual Conduit or Special Dual Cables(refer to EXFG Probe Guide for options)

7

3

DO NOT OPEN WHEN ENERGISED

OR WHEN AN EXPLOSIVE GAS

ATMOSPHERE IS PRESENT

Open casing

1 2

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GASATMOSPHERE IS PRESENT

Insert bolt from underside offlange and screw in to breakthe seal between the lid and the base

Remove flange bolts (16)

4 ELECTRICAL INSTALLATION…

…4.1 Conduit/Cable and Gland Specifications

4.1.2 EXFG Interface Electronics Unit to EXFG 4600 Transmitter UnitRefer to Table 4.2 for cable and gland specifications.

4.2 Access to Terminals – Fig. 4.1

Table 4.2 Cable and Gland Specifications – EXFG Interface Electronics Unit to EXFG 4600 Transmitter

Warning. The flange faces are flameproof paths and must be free from damage. If faces are damaged in any way theEXFG Interface Electronics Unit must be returned to the manufacturer for replacement.

Fig. 4.1 Access to Terminals

noitacificepSdnalG snoitacificepSelbaC noitacificepSdnalG

deifitrecfoorpemalf02MdnalgreirrabdxEE

)deilppuston(

elbaclangiS)deilppuston(

,deneercsllarevo,reppoceroc-4,2.0/61)sriapowt(foorpemalf

057ecnatsiserpool.xaM

0864deifitrecnU02M

)dettif(

5864dnalgoN

deriuqer

deifitrecfoorpemalf02MdnalgreirrabdxEE

)deilppuston(

elbacrewopsniaM)deilppuston(

mm5.0,eroc-3 2 ).nim(reppoc 0864deifitrecnU02M

)dettif(

5864dnalgoN

deriuqer

4685

4680

or

Mains power cable

Signal Cable

8

Single Conduit Entry (M25)Power/Signal

Mains Power Entry (M20)Not Used(blankedduringmanufacture)

Temperature Alarm Output (M20)and

O2, 4 to 20mA Retransmission (M20)

TB6

TB7

TB8

TB9

N/C

CO

M

N/O

N/C

CO

M

N/O

TB4

TB5

TB3

TB2

TB1

+ – + – + – + – + – L N EH H ESCR

To 'SCR'(if screen

is present)

BROW

N

RED BLUE

BLUE

GREE

N/YE

LLOW

TRIP –VE

CONT –VE

CONT –VE

MAINSUNDER TEMPALARM

OVER TEMPALARM

HEATERSUPPLY

CELLO/P mV

PROBECONTROL T/C

OVER TEMPTRIP T/C

RTX mALOGICTEMP ALARM

Single Conduitto Probe

(M25)

Earth Stud

TB1TB2TB3TB4TB5TB6TB7TB8TB9Earth Stud

3-core 0.5mm2 cable4-core cable

If this entry is notused it must beblanked using aflameproof certifiedEEx d M20 blanking plug

Non-4600 Version

TRIP +VE

WHITE

WHITE

BLUE

BLUE

4600 Version

…4 ELECTRICAL INSTALLATION

4.3 Conduit and Cable Connections

4.3.1 Single Conduit Connections – Fig. 4.2

Fig. 4.2 Single Conduit Connections

9

Earth Stud

TB1TB2TB3TB4TB5TB6TB7TB8TB9Earth Stud

Dual ConduitSignal Entry

(M25)

Temperature Alarm Output (M20)and

O2, 4 to 20mA Retransmission (M20)

Dual ConduitPower Entry

(M20)

Mains Power Entry (M20)If this entry is notused it must beblanked using aflameproof certifiedEEx d M20blanking plug

TB6

TB7

TB8

TB9

N/C

CO

M

N/O

N/C

CO

M

N/O

TB4

TB5

TB3

TB2

TB1

+ – + – + – + – + – L N EH H ESCR

RED

BLUE

MAINSUNDER TEMPALARM

OVER TEMPALARM

HEATERSUPPLY

CELLO/P mV

PROBECONTROL T/C

OVER TEMPTRIP T/C

RTX mALOGICTEMP ALARM

Signal Conduitto Probe

(M25)

Power Conduitto Probe

(M20)

BR

OW

N

BLU

E

GR

EE

N/

YE

LLO

W

3-core 0.5mm2 cable4-core cable

To 'SCR'(if screen

is present)

TRIP –VE

CONT –VE

CONT –VE

TRIP +VE

WHITE

WHITE

BLUE

BLUE

Non-4600 Version4600 Version

4 ELECTRICAL INSTALLATION…

…4.3 Conduit and Cable Connections

4.3.2 Dual Conduit Connections – Fig. 4.3

Fig. 4.3 Dual Conduit Connections

10

Earth Stud

TB1TB2TB3TB4TB5TB6TB7TB8TB9Earth Stud

TB6

TB7

TB8

TB9

N/C

CO

M

N/ON/C

CO

M

N/O

TB4

TB5

TB3

TB2

TB1

L N E

MAINSUNDER TEMPALARM

OVER TEMPALARM

HEATERSUPPLY

CELLO/P mV

PROBECONTROL T/C

OVER TEMPTRIP T/C

RTX mALOGICTEMP ALARM

Signal Cableto Probe

(M25)Power Cable

to Probe(M20)

3-core 0.5mm2 cable4-core cable

–SCR+ – + – + – + – + – H H E

Special SWASignal

Cable Entry forM20 Barrier

Gland with M25Reducer

SEE WARNING

TemperatureAlarmOutput (M20)

andO2, 4 to 20mA

Retransmission (M20)Special SWA

PowerCable Entry for

M20 BarrierGland

SEE WARNING

Mains Power Entry (M20)If this entry is notused it must beblanked using aflameproof certifiedEEx d M20blanking plug

Non-4600 Version4600 Version

To 'SCR'(if screen ispresent)

13 2 13 2

Signal cables are identified by cable number– see EXFG Probe Guide, Section 4.2.4

Green/Yellow

BrownBlueBlack

RedBlue

White

…4 ELECTRICAL INSTALLATION

…4.3 Conduit and Cable Connections

4.3.3 Dual Cable Connections – Fig. 4.4

Warning. When fitting barrier glands,the manufacturers instructions mustbe followed. Screens on cables mustbe isolated from the gland metalworkand chassis earth.

Fig. 4.4 Dual Cable Connections

11

115

Code Label

EXFG/0 0 0 X X X

Power Supply not Fitted0

230V1

115V2115

115

230 230

115

Heater Fuse(2.5A)

SEE WARNING

SEE WARNING

4 ELECTRICAL INSTALLATION…

4.4 Selecting the Mains Voltage – Fig. 4.5

Warning. Ensure bothmains voltage switchesare set to the samevoltage before power isapplied to the EXFGInterface ElectronicsUnit – see Section 4.6.

Fig. 4.5 Selecting the Mains Voltage

12

POWER HEATERO/TU/T

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GASATMOSPHERE IS PRESENT

DO NOT OPEN WHEN ENERGISED

OR WHEN AN EXPLOSIVE GAS

ATMOSPHERE IS PRESENT

Apply sufficient grease(part no. CG5317) toflange to form aweatherproof seal

Remove bolt fromrear of casing

Ensure grease is visible aroundentire flange, then remove excessgrease and use a feeler gauge toensure the gap between the lid andthe base is less than 0.15mm

Close casing

Insert and tighten flange boltsto approximately 10Nm

1

3

5

4

2

…4 ELECTRICAL INSTALLATION

4.5 Re-sealing the Cover after Connection – Fig. 4.6

Warning. Ensure all electrical connections have been made correctly before re-sealing and securing the cover. Do notswitch on mains power until the cover has been re-sealed and secured with all 16 (SS Grade A2–70) cover bolts tightenedevenly to approx. 10Nm. There should be no visible gap in the joint between lid and base. If in doubt check that a 0.2mmfeeler gauge does not fit into the gap at any point.

After switching power on, allow the probe to operate for aminimum of 1 hour to reach the correct operating temperature.

In normal operation, the power LED illuminates withinapproximately 15 minutes of switching on (according to the localtemperature at the probe heater) and the heater LED flashesevenly.

Fig. 4.6 Securing the Cover

Fig. 4.7 LED Indication of Operating Temperature

4.6 Switching Power On – Fig. 4.7

Information.• Ensure the Probe has been installed and connected correctly – see Sections 3 and 4 of the EXFG Probe Guide.

• If a 4680 or 4685 Transmitter is used, ensure that it has been installed and connected correctly as detailed inSections 3and 4 of the EXFG Transmitter Guide. Before switching the transmitter on, refer to Section 5 for Controls and Displaysand Section 6 for Operation (Instrument Start-up).

• The EXFG Interface Electronics Unit has no independent ON/OFF switch and must be powered-up from the mains switch.

13

Remove cover plate

Remove uppercover plate screw

Slacken lower cover plate screw 1

2

3

Reset Button

Zero Adjustment Screw

Span Adjustment Screw

5 SYSTEM CALIBRATION

Fig. 5.1 Access to the Zero and Span Controls

It is recommended that an air-based calibration is carried out when commissioning the system. An additional span calibrationprovides the ultimate system accuracy, but is only necessary if span errors are suspected. The EXFG system can be calibratedin situ by applying test gasses to the test gas inlet on the EXFG Probe and adjusting the reading on the EXFG InterfaceElectronics Unit display to give the correct ouput.

Note. It is not necessary to open the flameproof enclosure on either the EXFG Probe or the EXFG Interface electronics Unitto calibrate the system.

To calibrate the EXFG system carry out the following procedures:a) Switch power on and allow the probe to operate for a minimum of 1 hour to stabilize – see Fig.4.7.b) Remove the cover plate to allow access to the Zero and Span controls – see Fig. 5.1.c) Carry out an air based calibration as described in Fig. 5.2.d) If necessary, carry out a span gas calibration as described in Fig. 5.3.e) Refit the cover plate over the Zero and Span controls – see Fig. 5.1.f) Refit the test gas blanking plug – see Fig. 5.2. The test gas blanking plug must be a gas tight fit to prevent incorrect probe readings.

5.1 Tools RequiredMedium crosshead screwdriverM4 Allen keyZero (air) and span test gases (3000cc/min flow rate)

5.2 Access to the Zero and Span Controls – Fig. 5.1

14

+ -Adjust the Zero Screw… …until the correct value is displayed

Remove the dust cap, attach the test gaspipe and apply air at 3000cc/min for 10minutes or remove the probe from the ductand allow it to stabilize in normal atmosphere

1

2

POWER HEATERO/TU/T

4.61

+ - xx.xx

Attach the test gas pipe and apply spangas within the range 0.25% to 5% 02 inN2 at 3000cc/min. for 10 minutes

Adjust the Span Screw… …until the correct value is displayed– refer to Fig. 5.4 to obtain the correctvalue of output v. test gas O2%

1

2

…5 SYSTEM CALIBRATION

Fig. 5.2 Zero Calibration

Fig. 5.3 Span Calibration

15

FormulamA out = [8(1.397940009 – log(O2%))] + 4

Dis

pla

yed

Val

ue (m

A)

Oxygen (Volume) %

0.5 1 2 5 10 20 25

4

6

8

10

12

14

16

18

20

0.25

5 SYSTEM CALIBRATION

Fig. 5.4 Displayed Value (mA) v. Percentage Oxygen

16

6 FAULT FINDING

Fig. 6.1 Fault Finding Chart

CONDITION ACTION

a) Normal operation(approximately

N/A

15 minutes after power up).

a) Over temperature trip hasoperated.

Check trip thermocouple for open circuit and controlthermocouple wiring for short circuit or reversed connections.

When fault has been rectified, press and release RESET button– see Fig. 5.1.

a) Cell under temperature. If heater l.e.d. is lit continuously (not flashing) 15 minutes afterswitching on, check for faults c), d) and e).

b) Probe heater stil l warming up. If heater l.e.d. is lit continuously (not flashing) 15 minutes afterswitching on, check for faults c), d) and e).

c) Heater open circuit. Replace heater assembly – see Section 8.5*.

d) Thermocouple leads shorted orreversed.

Check thermocouple wiring – see Section 7.1.1*.

e) Heater loop resistance too high. Check the heater extension lead resistance by removing theheater wires at the H H terminals and measuring the resistanceacross the wires which should be between 22 and 28 – seeSection 4.3.

a) Control thermocouple opencircuit if l.e.d fails to flash after15 minutes of power on.

Check control thermocouple for open circuit – seeSection 7.1.1*.

a) No power to heater. Check probe control thermocouple for open circuit– see Section 7.1.1*.

Check fuse in heater circuit – see Fig. 4.5.

Check wiring (open circuit).

Check heater loop resistance – see step e) above.

a) No power to InterfaceElectronics Unit.

Check mains power supply.

b) Failure of internal power supply. Check operation of Interface Electronics Unit power supply.*Refer to the EXFG Probe Guide for section references.

LED INDICATION

POWER HEATERO/TU/T

POWER HEATERO/TU/T

4 – 20mADisplay

DO NOT OPEN WHEN ENERGISEDOR WHEN AN EXPLOSIVE GASATMOSPHERE IS PRESENT

POWER HEATERO/TU/T

POWER HEATERO/TU/T

POWER HEATERO/TU/T

POWER HEATERO/TU/T

POWER HEATERO/TU/T

LED OFF LED ON

Key to LED Indication

LED FLASHING(EVENLY)

Warning. Never open the EXFG Interface ElectronicsUnit in the presence of a flammable atmosphere.

PRODUCTS & CUSTOMER SUPPORT

ProductsAutomation Systems

• for the following industries:– Chemical & Pharmaceutical– Food & Beverage– Manufacturing– Metals and Minerals– Oil, Gas & Petrochemical– Pulp and Paper

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Sensors• Ammonia, Nitrate, Phosphate, Silica, Sodium, Chloride,

Fluoride, Dissolved Oxygen and Hydrazine Analyzers• Zirconia Oxygen Analyzers, Katharometers, Hydrogen Purity

and Purge-gas Monitors, Thermal Conductivity

Customer Support

We provide a comprehensive after sales service via a WorldwideService Organization. Contact one of the following offices fordetails on your nearest Service and Repair Centre.

United KingdomABB LimitedTel: +44 (0)1453 826661Fax: +44 (0)1453 829671

United States of AmericaABB Inc.Tel: +1 (0) 775 850 4800Fax: +1 (0) 775 850 4808

Client Warranty

Prior to installation, the equipment referred to in this manual mustbe stored in a clean, dry environment, in accordance with theCompany's published specification.

Periodic checks must be made on the equipment's condition. Inthe event of a failure under warranty, the following documentationmust be provided as substantiation:

1. A listing evidencing process operation and alarm logs at time offailure.

2. Copies of all storage, installation, operating and maintenancerecords relating to the alleged faulty unit.

IM/E

XFG

–IN

TIs

sue

6

The Company’s policy is one of continuous productimprovement and the right is reserved to modify the

information contained herein without notice.

Printed in UK (07.05)

© ABB 2005

ABB LimitedOldends Lane, StonehouseGloucestershire, GL10 3TAUK

Tel: +44 (0)1453 826661Fax: +44 (0)1453 829671

ABB Inc.Analytical Instruments9716 S. Virginia St., Ste. EReno, Nevada 89521USATel: +1 (0) 775 850 4800Fax: +1 (0) 775 850 4808

ABB has Sales & Customer Supportexpertise in over 100 countries worldwide

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1 INTRODUCTION 1.1 Documentation 1.2 Certification 1.3 System Overview

2 PREPARATION 2.1 Checking the Code Number

3 MECHANICAL INSTALLATION 3.1 Siting Requirements 3.2 Mounting

4 ELECTRICAL INSTALLATION 4.1 Conduit/Cable and Gland Specifications 4.1.1 EXFG Interface Electronics Unit to EXFG Probe 4.1.2 EXFG Interface Electronics Unit to EXFG 4600 Transmitter Unit

4.2 Access to Terminals 4.3 Conduit and Cable Connections 4.3.1 Single Conduit Connections 4.3.2 Dual Conduit Connections 4.3.3 Dual Cable Connections

4.4 Selecting the Mains Voltage 4.5 Re-sealing the Cover after Connection 4.6 Switching Power On

5 SYSTEM CALIBRATION 5.1 Tools Required 5.2 Access to the Zero and Span Controls

6 FAULT FINDING