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IS Application Guide
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IS Application Guide
Inside this guide, you will find common hazardous location applications involving intrinsicsafety barriers. To simplify your selection process, this guide identifies both zener diodeand galvanically isolated barrier solutions, and will help you decide which product is bestsuited to your application.
Both our SafeSnap and SafeSnapPlus zener diode barriers and our flexible K-System styleisolated barriers are highlighted. The SafeSnap zener diode barrier is our most economicalintrinsic safety barrier. Our SafeSnapPlus zener barrier features a replaceable fuse to protectthe safety components in the event of a fault condition. Galvanically isolated K-Systembarriers with removable wiring terminals combined with Power Rail compatibility offer thebest solution for process automation applications in a hazardous location.
Let Pepperl+Fuchs and its worldwide network of experts assist you in selecting intrinsicsafety barriers.
Switch Transfers ............................................................................................ 2Transmitters ................................................................................................... 6SMART Transmitters ..................................................................................... 8I/P Converters ............................................................................................. 10SMART I/P Converters ................................................................................ 12Thermocouples ........................................................................................... 14RTDs ............................................................................................................ 16Strain Gauges .............................................................................................. 18Vibration Monitoring ................................................................................... 19Potentiometers ............................................................................................ 20LED Clusters, Solenoids and Alarms ......................................................... 22Pulse Input/Serial Communication............................................................. 24Logic Controls ............................................................................................. 26Fieldbus ....................................................................................................... 28Power Supplies ........................................................................................... 30
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IS Application Guide
Z787. Z787.H.
Z786.
SafePlus
SafePlus
Z787.Safe
Plus
SafeSnap & SafeSnapPlus Zener Barrier
Figure 1 illustrates a standard method of transferring theswitch status. The zener diode barrier in the quasi-floatingconfiguration enables a load to operate in either leg of thepower supply.
Switches andNAMUR Sensors
Figure 1 Figure 2
Intrinsic Safety Barriers
SafeSnap & SafeSnapPlus Zener Barrier
Figure 2 illustrates an alternate method of providing mutlitplechannels in a quasi-floating configuration. The first channelof the Z787. (or Z787.H. ) is used as the field power supplywhile each diode return channel is isolated from ground.
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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IS Application Guide
Isolated Barrier
The barriers shown in the following diagrams are galvanically isolated switch repeaters. These units are provided withan amplifier that transfers discrete signals (NAMUR proximity sensors/mechanical contacts) from a hazardous area toa safe area. The proximity sensor or mechanical contact will initiate a safe area control mechanism in the barrier suchas a relay contact or transistor. The following illustrations show several of the possible configurations.
LB/SCLB/SC LB
R2
R1 R1
Figure 3
Intrinsic Safety Barriers
Single Channel AC
Note: Lead breakage (LB) and short circuit (SC) monitoring can be selected or disabled by placingexternal resistors (R1, R2) and by positioning switches on the barrier. For LB, a 10 K resistor(R1) is used and for SC a 400 to 2 k resistor (R2) is used.
Input 2
Input 1KFA5-SOT2-Ex2 KFA6-SOT2-Ex2
R2
R1 R1
LB/SCLB/SC LB
R2
R1 R1
Figure 6
LB/SCLB/SC LB
R2
R1 R1
Figure 4
Dual Channel AC
Input 2
Input 1
LB/SCLB/SC LB
R2
R1 R1
R2
R1 R1
Figure 5
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Isolated Barriers
Single Channel DC
Collective Error Messaging
LB/SCLB/SC LB
R2
R1 R1
Collective Error Messaging
LB/SCLB/SC LB
R2
R1 R1
Collective Error Messaging
LB/SCLB/SC LB
R2
R1 R1
Collective Error Messaging
LB/SCLB/SC LB
R2
R1 R1
LB/SCLB/SC LB
R2
R1 R1
Figure 7
Figure 8
Figure 9
Figure 11
Figure 10
Intrinsic Safety Barriers
Note: Lead breakage (LB) and short circuit (SC) monitoring can be selected or disabled by placingexternal resistors (R1, R2) and by positioning switches on the barrier. For LB, a 10 K resistor(R1) is used and for SC a 400 to 2 k resistor (R2) is used.
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IS Application Guide
Dual Channel DC
Collective Error Messaging
Input 2
Input 1
LB/SCLB/SC LB
R2
R1 R1
R2
R1 R1
Collective Error Messaging
Input 2
Input 1
LB/SCLB/SC LB
R2
R1 R1
R2
R1 R1
Figure 12
Figure 13
Figure 17
Intrinsic Safety Barriers
Collective Error Messaging
2:1 Wire LB/SC 2:1 Wire LB/SC
Note: Lead breakage (LB) and short circuit (SC) monitoring can be selected or disabled by placingexternal resistors (R1, R2) and by positioning switches on the barrier. For LB, a 10 K resistor(R1) is used and for SC a 400 to 2 k resistor (R2) is used.
Quad Channel DCFigure 14
Input 2
Input 1KFD2-SOT2-Ex2
R2
R1 R1
Collective Error Messaging
LB/SCLB/SC LB
R2
R1 R1
Input 2
Input 1KFD2-SOT2-Ex2.IO
R2
R1 R1
R2
R1 R1
LB/SCLB/SC LBCollective Error Messaging
Collective Error Messaging
Input 2
Input 1
LB/SCLB/SC LB
R2
R1R1
R2
R1R1
Figure 15
Figure 16
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Transm
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rs IS Application Guide
SafeSnap & SafeSnapPlus Zener Barrier
This is the most common method of connecting a 2-wiretransmitter to a zener barrier. Due to the quasi-floatingconfiguration of this barrier, multiple I/O channels are notrequired to be isolated from one another.
SafeSnap & SafeSnapPlus Zener Barrier
The figure below shows the most efficient method of connecting2-wire transmitters providing the power supply for each I/Ochannel is individually isolated from one another or themeasurement load is attached to the positive leg of the supplyas shown.
SafeSnap Zener Barrier
If the I/O system requires a 1-5 V input, the Z788.R contains aprecision 250 resistor internally connected between Terminals3 and 4 to facilitate the 1-5 V output from a 4-20 mA transmitter.
Z787.Safe
Plus
Z728.Safe
Plus
Figure 1
Figure 2
Figure 3
Transmitters
Intrinsic Safety Barriers
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Note: If additional voltage is required for the transmitter,the Z788.R.H can provide the necessary increase.The entity parameters must, however, be verified.
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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Transm
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IS Application Guide
24VDC
KFD2-STC4-Ex2 KFD2-STC4-Ex2-Y72195
24VDC
24VDC
24VDC
Isolated Transmitter Power Supply
This galvanically isolated transmitter power supply provides 3-way isolation between power, input and output for optimalsignal integrity. This intrinsic safety barrier can be used for 2 or3-wire transmitters (0/4-20 mA) and will source current to a1000 load in the safe area with an accuracy of 10 A.
Isolated Transmitter Power Supply
This figure shows a galvanically isolated transmitter powersupply similar to Figure 5, except the safe area output sinksthe current from the I/O device.
Isolated Transmitter Power Supply
This figure illustrates a galvanically isolated transmitter powersupply similar to Figure 5, except the safe area output is avoltage signal of 0/1-5 V (KFD2-CV-Ex1.30-305) or 0/2-10 V(KFD2-CV-Ex1.30-310).
Figure 5
Figure 6
Figure 7
Figure 4
Intrinsic Safety BarriersDual Channel IsolatedTransmitter Power Supply
This dual channel galvanically isolated transmitter power supplyprovides 3-way isolation between power, input and output foroptimal signal intergrity. This isolator powers a 2 wire tranamitterwithin a hazardous area and transfers the anlog 4-20 mA signalfrom the hazardous to the safe area.
Note: The KFD2-STC4-Ex-Y72195 has sink mode outputs
8 Pepperl+Fuchs Inc. Telephone (330) 425-3555 FAX (330) 425-4607E-mail: [email protected] www.am.pepperl-fuchs.com
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AR
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smit
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IS Application Guide
SafeSnap & SafeSnapPlus Zener Barrier
For bidirectional digital communication between the safe andhazardous locations, the Z787. is the most common zenerbarrier used for SMART transmitter applications. Thecommunicator can be connected as shown, however otherconfigurations are possible.
Z728.Safe
Plus
Z787.Safe
Plus
Figure 1 Figure 2
SMART Transmitters
Intrinsic Safety Barriers
SafeSnap & SafeSnapPlus Zener Barrier
The figure below shows an alternate method of achievingbidirectional SMART communication through a zener diodebarrier. The circuit implementing the Z728. zener barriermust be individually isolated from each I/O channel or musthave the measurement load attached to the positive leg of thesupply for proper analog/digital communication to occur.
Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation. SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation.SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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24VDC
Isolated SMART Transmitter Power Supplies
The following illustrations identify wiring diagrams for P+Fs galvanically isolated SMART transmitter power supplies.This group of barriers provides signal isolation between the hazardous and safe areas while providing the necessary voltagefor 2-wire SMART transmitters. SMART transmitters from Enress+Hauser, Fisher-Rosemount, Foxboro, Honeywell, Smarand Yokogawa have been successfully tested with P+F isolators. It must be noted that some high frequencies used forcommunication require the KFD2-STC3-Ex1 or KFD2-STV3-Ex1 to be used since these isolators are rated for frequenciesup to 40 kHz. The transfer characteristics of these units is 0.05% of its full scale.
Figure 3
Figure 4
Figure 6
Note: Depending on calibrator design, connection can bemade across Terminals 9 and 10 in the safe area.
Note: Unit Can be configured for different outputsEx1-1 for 1-5 V outputEx1-2 for 2-10 V output
Intrinsic Safety Barriers
4
6
14
7
15
8
11
KFD2-STC4-Ex2 KFD2-STC4-Ex2-Y72195
24VDC
KFD2-STC4-Ex1
24VDC
14
7
15
8
11
KFD2-STC4-Ex1.20 KFD2-STC4-Ex1.20-Y72216
24VDC
Note: The KFD2-STC4-Ex2-Y72216 has sink mode outputs.
Note: The KFD2-STC4-Ex2-Y72195 has sink mode outputs
Figure 5
Figure 7
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I/P
Con
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IS Application Guide
SafeSnap & SafeSnapPlus Zener Barrier
A single channel Z728. is the most efficient methodof connecting an I/P converter if the power supply inthe controller is either isolated from other I/O channelsor has its negative return connected to the earth ground.
Z728.Safe
Plus
Z787.Safe
Plus
Figure 1 Figure 2
I/P Converters
Intrinsic Safety Barriers
SafeSnap & SafeSnapPlus Zener Barrier
A dual channel Z787. can be used in situations where thereturn line of the I/P cannot be connected to the earth ground.The additional diode-return channel of the Z787. providesisolation for the 4-20 mA current.
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Note: In order to conserve DIN rail space, the dual channelZ779. could provide operation and protectionfor two I/P converters if the Z728. is acceptable.
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I/P C
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rs IS Application Guide
Isolated Current Driver
The loop powered KFD0-CS-Ex1.51 barrier is galvanicallyisolated making its application very simple. Although primarilydesigned for fire detector applications where accuracy ismuch less important, it is usually accurate enough for I/Ps.The accuracy of the KFD0-CS-Ex1.51 is 200 A.
4-35 VDC
KFD0-CS-Ex1.51
Figure 4
Intrinsic Safety Barriers
I
Isolated Current Driver
The KFD2-SCD-Ex1.LK current driver barrier features 3-way isolation between power, input and output. The isolatoris designed to control I/P converters in a hazardous location.It also provides lead breakage and short circuit monitoring.
Figure 5
Dual Channel Isolated Current Driver
The KFD2-SCD2-Ex-2.LK is a dual channel current driverbarrier, and provides 3-way isolation between power, inputand output. The isolator is desiged to control I/P converterselectrical values and positioners in a hazardous area. It alsoprovides lead breakage and short circuit monitoring.
Figure 6
Collective Error Messaging
KFD2-SCD2-Ex2.LK
I
I
Isolated Current/Voltage Driver
The KFD2-CD-Ex1.32 driver barrier features high accuracy andtemperature stability. By special order both the input andoutput of this galvanically isolated barrier can be altered to suitthe application. They can be independently configured foreither voltage or current. This module provides 3-way isolationbetween power, input and output for superior signal integrity.
Figure 3
Note: A dual channel KFD0-CS-Ex2.51 can provideboth cost and space savings.
12 Pepperl+Fuchs Inc. Telephone (330) 425-3555 FAX (330) 425-4607E-mail: [email protected] www.am.pepperl-fuchs.com
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AR
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Con
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IS Application Guide
SafeSnap Zener Barrier
A single channel Z728. is the most efficient method ofconnecting a 2-wire SMART I/P if the power supply in thecontroller is either isolated from other I/O channels or has itsnegative return connected to the earth ground.
Z787.Safe
Plus
Z728.Safe
Plus
Figure 1 Figure 2
SMART I/P Converters
Intrinsic Safety Barriers
SafeSnap Zener Barrier
A dual channel Z787. can be used in situations where thereturn line of the SMART I/P cannot be connected to the earthground.The additional diode-return channel of the Z787.provides isolation for the 4-20 mA current and digital signal.
Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation.SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation.SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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I
Isolated SMART Current Driver
The KFD2-SCD-Ex1.LK SMART current driver barrier provides3-way isolation between power, input and output for optimalsignal integrity. This intrinsic safety barrier is designed tocontrol SMART I/P converters in a hazardous location. Thedigital information generated by the processing system, fielddevice or hand-held terminal is bidirectionally transferred bythe barrier.
Figure 3
Intrinsic Safety Barriers
Dual-Channel LsolatedSmart Current Driver
The KFD2-SCD2-Ex2.LK is a dual channel SMART currentdriver barrier, and which provides 3 way isolation betweenpower, input and output. The isolator is designed to controlSMART I/P converters,electrical valves and positioners in ahazardous area. It also provides lead breakage and shortcircuit monitoring.
Figure 4
Collective Error Messaging
KFD2-SCD2-Ex2.LK
I
I
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Th
erm
ocou
ple
s IS Application Guide
SafeSnap & SafeSnapPlus Zener Barrier
This is most common method of connecting a thermocouple toa zener diode barrier. The dual channel configuration providesa balanced circuit with a maximum of 64 in each channel,allowing operation for any thermocouple type.
Z960.
SafePlus
Figure 1
Thermocouples
Intrinsic Safety Barriers
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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Th
erm
ocou
ple
s IS Application Guide
Isolated Thermocouple Transmitter
Figure 5
Figure 2
Intrinsic Safety BarriersIsolated Loop PoweredThermocouple Transmitter
The loop powered KFD0-TT-Ex1 barrier is galvanically isolatedand provides a 4-20 mA output for multiple thermocoupleinputs. This barrier can be configured manually for thethermocouple type and upscale or downscale burnout and isalso provided with zero and span point potentiometers.
Isolated ThermocoupleTransmitter-mA
This figure illustrates a galvanically isolated thermocoupletransmitter barrier. With its 3-way isolation between powersupply, input and output, this barrier provides accuracy andtemperature stability over the entire input range selected. Thethermocouple type, burnout condition, span, zero, taginformation and user specific data are configurable through astandard PC port and a P+F software package.
PC Interface
Figure 4
Isolated Millivolt Repeater
When an increased interference rejection or increased isolationbetween the thermocouple and measuring instrument isrequired, this galvanically isolated mV repeater can providethe necessary results. This barrier will repeat the mV signalgenerated by the thermocouple while the KFD2-VR-Ex1.50m.R and KFD2-VR-Ex1.50m.L will additionally outputa +80 mV or 80 mV signal during a burnout condition.
Figure 3
The KFD2-TT-Ex1 is galvanically isolated and provides a 0/4-20 mA output for multiple thermocouple inputs. This isolatoris configured manually for thermocouple type and upscale ordownscale burnout.
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RT
Ds
IS Application Guide
SafeSnap Zener Barrier
This circuit shows a 3-wire RTD connected to a Z954 zenerbarrier. Due to its 3-channel configuration, the negativepower supply lead is not connected directly to ground,providing a quasi-floating system. All three channels havematched end-to-end resistance which in conjunction with thebridge measuring instrument keep errors to a minimum.
Z961.
SafePlus
Z961.
SafePlus
SafeSnap Zener Barriers
A 4-wire RTD connection with zener barriers offers the mostaccuracy. In this configuration, the measurement circuit is notsensitive to the end-to-end resistance of the barrier.
Figure 1
Figure 2
RTDs
Intrinsic Safety Barriers
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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IS Application GuideR
TD
sIntrinsic Safety Barriers
Isolated RTD Transmitter-mA
This figure illustrates a galvanically isolated RTD transmitterbarrier. With its 3-way isolation between power supply, inputand output, this barrier provides accuracy and temperaturestability over the entire input range selected. The RTD type,lead breakage condition, span, zero, tag information anduser specific data are configurable through a standard PCport and a P+F software package.
Isolated Loop PoweredRTD Transmitter
The loop powered KFD0-TR-Ex1 barrier is galvanically isolatedand provides a 4-20 mA output for 2-, 3-, or 4- wire RTDs. Thezero and span for the RTD are adjusted manually with calibrationpotentiometers located on the barrier.
Isolated RTD Repeater
When increased interference rejection or increased isolatedbetween the RTD and measuring instrument is required, thisgalvanically isolated RTD repeater can provide the necessaryresults. Depending on the required accuracy, this barrier canbe used in a 2-, 3- or 4-wire configuration. The barrier repeatsthe resistance measurement of the RTD into the safe area.
PC Interface
Figure 4
Figure 5
Figure 3
IS Application Guide
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Str
ain
Gau
ges
Strain Gauges
Intrinsic Safety Barriers
Isolated StrainGauge Current Transmitter
This figure illustrates a galvanically isolated strain gaugetransmitter barrier. With its 3-way isolation between powersupply, input and output, this barrier provides a highlyaccurate means of supporting strain gauge applicationswithin a hazardous location. The strain gauge can beconnected in either a 4- or 6-wire configuration depending onthe required accuracy. The strain gauge excitation voltage,mV signal range, tare value and current output range are allfield selectable on the barrier.
24VDC
Figure 2
Z966.
Z964.
SafePlus
SafePlus
Z961.
SafePlus
SafeSnap & SafeSnapPlus Zener Barrier
The Z966. zener barrier supplies a 350 strain gauge bridgewith the necessary excitation voltage while the optional Z964.supplies the power supply with a voltage sense input forincreased accuracy. The millivolt signal is transferred to thesafe area through the Z961. . These barriers are connected ina quasi-floating configuration for the best possible signalintegrity when using zener barriers.
Figure 1
Note: SafeSnapPlus zener barriers are designed witha replaceable fuses which is denoted by an Fat the end of the model number. SafeSnapzener barriers have internal fuses.
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IS Application GuideV
ibra
tion
Mon
itorin
g
Vibration Monitoring
Intrinsic Safety Barriers
Isolated Voltage Repeater
For applications where the frequency requirements areover 5 kHz, the KFD2-VR-Ex1.19-Y109129 will accept anactive voltage pulse up to +/-10V. The voltage pulse can betransmitted up to frequencies of 50 kHz.
Figure 3
SafeSnap Zener Barrier
This figure illustrates an example of a zener diode barrierand a vibration monitor in the hazardous area. The vibrationmonitor outputs a voltage signal, which is referenced to thepositive supply, proportional to the vibration waveform atfrequencies up to 4 kHz. Therefore, a negative polaritybarrier is required and the positive side of the power supplymust be grounded.
Figure 1
24VDC
Isolated Voltage Repeater
The galvanically isolated model KFD2-VR3-Ex1.26 isdesigned specifically for use with vibration monitoringinstruments. The unit is designed with three port isolationbetween power, input and output while it provides a stablesupply for the vibration transducer. A high-input impedanceamplifier modifies the transducer signal and repeats thesignal on safe side by a second amplifier to give low-outputimpedance.
KFD2-VR-Ex1.19-Y109129
24VDC
Figure 2
IS Application Guide
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Pote
nti
om
ete
rs
Potentiometers
Intrinsic Safety Barriers
SafeSnap & SafeSnapPlus Zener Barrier
If the accuracy of the potentiometer signal is not critical, theZ960. offers a 3-wire configuration that connects the returnline to the I.S. ground. This connection can influence themeasurement since the resistance in the negative line must betaken into account.
SafeSnap & SafeSnapPlus Zener Barrier
When a higher degree of accuracy is required on the potentiometervoltage signal, a four-wire connection is recommended. In thiscase, neither the source nor the signal is connected to the I.S.ground. This results in a high level of accuracy.
Figure 1 Figure 2
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
Z961.
Z961.
SafePlus
SafePlus
Z960.
SafePlus
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.
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IS Application GuideP
ote
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mete
rsIntrinsic Safety Barriers
Isolated PotentiometerTransmitter-mA
These potentiometer transmitter barriers feature 3-way gal-vanic isolation between power supply, input and output for thebest signal conversion accuracy and noise immunity. Thisbarrier can be configured for either 3-, 4- or 5-wire potentiom-eters depending on the required accuracy of the application.The KFD2-PT2-Ex1-4 and KFD2-PT2-Ex1-5 are designed toprovide a safe area signal of 0-20 mA and 4-20mA respectively.
Figure 3
24VDC
KFD2-PT2-Ex1-4(5)
24VDC
5
KFD2-PT2-Ex1-(1)(2)(3)
Isolated PotentiometerTransmitter-Voltage
The KFD2-PT2-Ex1, KFD2-PT2-Ex1-1, KFD2-PT2-Ex1-2 andKFD2-PT2-Ex1-3 are similar to the unit shown in Figure 3,except the safe area output is a voltage signal of 0-10V,0-5V, 2-10V and 1-5V respectively.
Figure 4
IS Application Guide
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LE
D C
lust
ers
, S
ole
noid
s an
d A
larm
s
LED Clusters, Solenoidsand Alarms
Intrinsic Safety Barriers
Isolated Loop PoweredDiscrete Output Driver
The loop powered KFD0-CS-Ex1.51P barrier is a galvanicallyisolated discrete output barrier. It can be used to energizecertain types of solenoids, LEDs and alarms. With a 24 Vsource, this barrier will supply approximately 27 mA at 12 Vto the hazardous area field instrument.
Note: A dual channel KFD0-CS-Ex2.51 provides both costand DIN rail space savings.
Isolated Loop PoweredSolenoid Driver
The following solenoid driver barriers provide the necessarypower to energize discrete output instruments such assolenoids, LEDs and alarms. The KFD2-SD-Ex1.48, KFD2-SD-Ex1.48-90A and KFD2-SD-Ex1.36 are internally current-limited to 35mA, 45mA and 80mA respectively.
SafeSnap & SafeSnapPlus Zener Barrier
Figure 1 illustrates the standard method of driving solenoids,LED clusters and audible/visual alarms in a hazardous location.For this configuration, the control switch must be located inthe source line for proper operation. If additional voltage isrequired for the field instrument, a Z728.H. may provide thenecessary increase.
SafeSnap & SafeSnapPlus Zener Barrier
This figure shows an alternate method of driving solenoids,LED clusters and audible/visual alarms in a hazardous locationwhen the control switch is located in the return line.
5-35 VDC
Figure 3
Figure 4
Z728.
SafePlus
Z728.H
Figure 1
Z787. Z787.H.
SafePlus
Figure 2
Note: SafeSnapPlus zener barriers are designed withreplaceable fuses which is denoted by an Fat the end of the model number. SafeSnapzener barriers have internal fuses.
Note: SafeSnapPlus zener barriers are designedwith replaceable fuses which is denotedby an F at the end of the model number.SafeSnap zener barriers have internal fuses.
4-35 VDC
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IS Application GuideLE
D C
luste
rs, Sole
noid
s an
d A
larm
sIntrinsic Safety Barriers
A
Isolated Logic InputSolenoid Driver
These solenoid driver barriers are separately powered andcan be used to energize solenoids, LEDs and alarms througha logic input: 0-2.2 V, logic 0 and 3-35 V, logic 1. The KFD2-SL-Ex1.48-90A and KFD2-SL-Ex1.36 are internally current-limited to 45mA and 80mA respectively.
Figure 5
Isolated Logic InputSolenoid Driver
The KFD2-SL2-Ex1 Single channel solenoid driverprovides power to a load in a hazardous area and can beswitched on or off by a signal from a logic circuit. It alsoprovides lead breakage, short circuit monitoring andcollective error messaging.
Figure 7
Collective Error Messaging
KFD2-SL2-Ex2 KFD2-SL2-Ex2.B
Dual-channel IsolatedLogic Input Solenoid Driver
The KFD2-SL2-Ex2 dual channel solenoid driver providespower to a load in a hazardous area and can be switched onor off by a signal from a logic circuit. It also provides leadbreakage, short circuit monitoring and collective error mes-saging.
Figure 6
Collective Error Messaging
KFD2-SL2-Ex1.LK
Isolated Logic InputSolenoid Driver
The KFD2-SL2-Ex1.LK solenoid driver provides power toa load in a hazardous area and can be switched on or offby a signal from a logic circuit. It also provides leadbreakage, short circuit monitoring and collective errormessaging and a relay contact fault output that can bewired in series for a fail-safe configuration.
Figure 8
Collective Error Messaging
KFD2-SL2-Ex1 KFD2-SL2-Ex1.B
Note: The KFD2-SL2-Ex1.B is the basic unit and doesnot include such features as LB/SC monitoringand collective error messaging.
Note: KFD2-SL2-Ex2.B is the basic unit and does notinclude such features as LB/SC monitoring orcollective error massaging.
IS Application Guide
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Plu
se In
pu
t/S
eri
al C
om
mu
nic
ati
on
Pulse Input/SerialCommunication
Intrinsic Safety Barriers
SafeSnap & SafeSnapPlus Zener Barrier
The figure below illustrates an example of a zener diode barrierand an active pulse generator located in the hazardous area.The voltage pulse can be as high as 20 V since the signal isisolated from ground due to the dual channel configuration ofthe zener diode barrier.
Z787.Safe
Plus
Figure 1Figure 2
Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denotedby an F at the end of the model number.SafeSnap zener barriers have internal fuses.
SafeSnap & SafeSnapPlus Zener Barrier
This configuration can be used when the passive pulse signalgenerator requires a voltage source to operate. The pulsesare received in the safe area through the diode return channelof the barrier. These diodes may attenuate the pulse height,therefore the sensitivity of the receiving instrument must beconsidered.
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IS Application GuideP
ulse
Inp
ut/S
eria
l Com
mu
nic
atio
nIntrinsic Safety Barriers
Isolated Millivolt Repeater
This galvanically isolated millivolt repeater provides 3-wayisolation between the power, input and output for the bestpulse repetition. When the active pulse signal has a magni-tude of 500 mV, the KFD2-VR-Ex1.500 m will accuratelyrepeat the signal up to 1.3 kHz.
24VDC24VDC
Figure 5
24VDC24VDC
Figure 3 Figure 4
Isolated RS232 Repeater
This figure illustrates a galvanically isolated RS232 repeaterused for data transfer through a hazardous area. The figurebelow shows the signal being passed through the hazardouslocation at a maximum data transfer of 20 k bits/sec. Sincethe barrier is galvanically isolated, an intrinsic safety ground isnot necessary.
Isolated Voltage Repeater
This figure shows a galvanically isolated voltage repeatersimilar to Figure 3, except the active pulse signal can have amagnitude of 10 V. Additionally, the KFD2-VR-Ex1.19 willtransmit the voltage pulse at frequencies up to 4 kHz.
IS Application Guide
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Logic
Con
trols
/Lim
it A
larm
s
Logic Controls/Limit Alarms
Intrinsic Safety Barriers
Isolated Speed Monitoring
Often it is necessary to know if a process is operating under orover a desired speed. The KFD2-DWB-Ex1.D provides relayoutputs that energize at field-programmed setpoints.
Isolated Rotation Direction Indicatorand Synchronization Monitor
The galvanically isolated KFD2-UFT-Ex2.D comes witha display for easy on site programming and is used whena rotation direction indicator or synchronization monitoris needed. A non-display unit is available with theKFD2-UFT-Ex2. Figure 4
Figure 1
Note: For AC versions of this unit ask for our universalpower supply version the KFU8-UFT-Ex2.D or theKFU8-UFT-Ex2. Collective error messaging &power rail connection are not available on theuniversally powered units.
Note: For AC powered units ask for our universal powersupply version, the KFU8-UFC-Ex1.D or KFU8-UFC-Ex1. Collective error messaging & Power Rail connec-tions are not available on the universally powered units.
Note: For AC versions of this unit order the KFA5-DU-Ex1.D (120 VAC) or the KFA6-DU-Ex1.D (240 VAC).The AC units are not equipped with collective errormessaging or power rail connection.
Isolated UniveralFrequency Converter
The galvanically isolated KFD2-UFC-Ex1.D comes with adisplay for easy on site programming and converts thesignals from a NAMUR proximity sensor or dry contact intoa 0/4-20 mA output. For non-display version use the KFD2-UFC-Ex1.
Figure 2
Isolated TimeDelay Relay
The galvanically isolated KFD2-DU-Ex1.D comes with adisplay for easy on site programming and is commonly used inapplications requiring on delay, off-delay, one-shot or pulsatingsignal conditioning.
Figure 3
10
171618192087
13142324
Output 1
Output 2
Output 3
Output 4 0/4-20 mA
Start Up Override
Supply 24 VDC
KFD2-UFC-Ex1 KFD2-UFC-Ex1.D
Programming JackGND
TxDRxD
Collective Error Messaging
1
3
12
11
111012
1314
2324
3 3
11
Output 1
Output 2
Reset
Supply 24 VDC
KFD2-DU-Ex1.D
3
Hazardous Area
1
Collective Error Messaging
19
20
17
1618
111012
13
14
23
24
1
Output 1
Output 2
Start Up Override
Supply 24 VDC
KFD2-DWB-Ex1.D
3
Collective Error Messaging
Note: For AC Powered units ask for KFA5-DWB-Ex1.D (120VAC) or KFA6-DWB-Ex1.D (240 VAC). Collective errormessaging and power rail connection are not availableon the AC units.
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IS Application GuideLogic
Con
trols/L
imit A
larm
sIntrinsic Safety Barriers
Isolated Limit Alarm
The following galvanically isolated limit alarm provides twoindependent set points for RTDs, thermocouples or voltage/current signals. This intrinsic safety barrier is PC configurablefor trip point, hysteresis and high/low alarm. These modulesnot only provide the necessary isolation for intrinsic safety,but also offer a simple logic function for alarm set points.
Isolated Latching Relay
The galvanically isolated KFA5-SR2-Ex2.W.IR provideslatching functions for use as a two step controller.To maintain the levels of a process between two points, thislevel control unit can be programmed for pump-up or pump-down applications.
Figure 5
Figure 6
8
79
14
31
1
Output 1
Output 2
Supply 24 VDC
KFD2-GU-Ex1
3
Hazardous Area
2
5
4
6
15
11
10122 wire
Input for RTDs 3 wire
wire2 4
312
2
2
5
6
Input for voltage supply
Input for voltage supply
Cold junction compensation on
Input for thermocouples
0V-20 mA 4V-20 mA
0V-10V 2V-10V
Programming JackGND
TxDRxD
KFA5-SR2-Ex2.W.IR
8
7
9
14
Output 1
Output 2
Supply 120 VAC15
11
10
12
1
3
4
6
Isolated Limit Alarm
The KFD2-CRG-Ex1.D is a galanically Isolated transmitterpower supply for a 2- or 3-wire transmitter or current source.It not only repeats the 0/4-20 mA signal but has twoprogrammable relay outputs. Lead breakage and short-circuit monitoring are provide along with collective errormessaging.
Figure 7
Note: For AC powered versions of this unit,ask for our universal power version, KFU8-CRG-Ex1.D. Collective error messaging andpower rail connections are not available onthe universally powered units.
8
7
Output 1
Output 2
Supply 24 VDC
KFD2-CRG-Ex1.D
11
1012
Collective Error Messaging
17
16
18
23
24
0/4-20mA Output
IS Application Guide
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Fie
ldbus
Figure 1
24VDC
The KLD2-PR-1.IEC fieldbus repeater can be used in generalpurpose applications with several fieldbus segments. It providesgalvanic isolation between two segments, refreshes thecommunication signal and is capable of extending the length ofa fieldbus segment.
The KLD2-PR-Ex1.IEC fieldbus repeater can be used in intrinsicsafety applications. It provides galvanic isolation between an ISand a non-IS fieldbus segment.
Figure 3
24VDC
KLD2-PR-NI1.IEC
Div 2
24VDC
KLD2-PR-Ex1.IEC
IEC 1158-2 host segment
24VDC
The KLD2-PR-Ex1.IEC fieldbus repeater can be used in ISapplications that are based on the FISCO (Fieldbus IntrinsicallySafe Concept) model.
The KLD2-PR-NI1.IEC fieldbus repeater can be used inapplications where the repeater and the isolated fieldbus segmentare located in a Div. 2 hazardous area. Since the unit providesnon-incendive, energy-limited output, Div. 2 installationrequirement and wiring methods are simplified
Figure 4
Fieldbus
Intrinsic Safety Barriers
Figure 2
Overview: Safe Area or Div. 2 Hazardous Area
FieldbusTerminator
HostDCS/PLC
FieldbusTerminator
FieldbusPowerSupply
IsolatedFieldbusPower
Supply/Repeaters
ISFieldbusPower
Supply/Repeaters
Isolated Fieldbus Power Supplies Repeaters
Note: Repeater has a build-in terminator on the host sideselectable terminator on field side and a switchto select powered or non-powered host.
Note: Repeater has a build-in terminator on the host sideselectable terminator on field side and a switchto select powered or non-powered host.
Note: Repeater has a build-in terminator on the host sideselectable terminator on field side and a switchto select powered or non-powered host.
Note: Repeater has a build-in terminator on the host sideselectable terminator on field side and a switchto select powered or non-powered host.
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IS Application GuideFie
ldb
usFieldbus
Host
KLD2-STR-1.24.400.IEC Fieldbus Power Supply
P+F KMDO-FT-EX Terminator
Figure 8
SafeSnap Zener Barrier
The figure below illustrates a zener diode barrier used toisolate a hazardous location field bus application. TheZ922 communicates at 31.25 kbts/sec (Foundationfieldbus, PROFIBUS-PA).
Fieldbus Host
24VDC 24VDC
Fieldbus Power Supply
The KLD2-STR-1.24.400.IEC is a power supply for fieldbusapplications. It features a fieldbus impedance matchingnetwork and provides a constant voltage for networkinstruments, independent of its load. It has a built inteminator on the field side.
Profibus Segment Coupler
The galvanically isolated KFD2-BR-Ex1.3PA.93 segmentcoupler used in Profibus DP/PA applications isolates theintrinsically space PROFIBUS-DP branch.
Figure 7
Fieldbus Terminator
The KMD0-FT-Ex is a fieldbus terminator. Both ends of afieldbus segment must be terminated to assure properfunction and prevent reflections. The KMD0-FT-Ex offers asimple and economical termination method for fieldbusinstallations.
Figure 6
Note: A high-speed, segment coupler with up to12 Mbaud on PROFIBUS-DP is also available.
Intrinsic Safety Barriers
Figure 5
IS Application Guide
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Pow
er
Su
pp
lies
Power Supplies
Power Supplies
Collective Error Massaging
The collective error messaging enables lead breakage andshort circuit monitoring for Pepperl+Fuchs isolators. TheKFD2-EB2 power feed module combined with PR-05 orUPR-05 power rail allows a fault signal to be transferredalong the power rails 4th conductor to the KFD2-EB2 andprovides a relay contact output for the entire isolator group.
Redundant Power Feed Modules
When a process needs a higher degree of safety and reliability,use two KFD2-EB-R4A.B modules. If either power supply fails, thepower rail and isolators continue to be energized via the secondpower feed module.
Conventional Wiring Method
The conventional method of wiring barriers is daisy-chainingfrom barrier to barrier.
Power Rail Method
Eliminate the labor intensive daisy chain method by using PowerRail. Combined with the KFD2-EB2 power feed module and thePR-02 or UPR-02 power rail, this configuration quickly and easilydistributes power to all the barriers via 2 gold plated conductors.
Figure 1 Figure 3
Figure 2 Figure 4
Note: PR-02 is a 500 mm insert for standard 35mm DINRail. UPR-02 is sold in 2 meter lengths and comeswith its own 35 mm DIN Rail.
24VAC1112
24VDC
1112 24VDC
10
7
Fault Signal Output
1112
24VDC
10
7
Fault Signal Output
1112
24VDC
10
7
Fault Signal Output
Fault Signal
PowerDistribution
withoutPower Rail
PowerDistribution
withPower Rail
Power FeedModule
RedundantPower Feed
Modules
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IS Application GuideP
ow
er S
up
plie
sPower Supplies
Figure 5
Power Supply
Provide a complete solution for an isolator installation by usinga 120/240VAC to 24VDC/4A power supply. The KFA6-STR-1.24.4. It snaps quickly on to power rail to easily distributepower to the isolators.
Power Supply
The KFA6-STR-1.24.500 provides 24VDC 500 mA for thosesmall projects that do not require a large number of isolators.It snaps quickly on to Power Rail to easily distribute power tothe isolators.
Figure 6
A - Three conductors for bus connection (PR-O5 only)
B - Two conductors for power supply
C - DIN Rail
D - End Cap
E - Power Rail
C
A
BD
E
Figure 1
A - Cover
B - Two leads for power
C - Three leads for bus correction (UPR-O5 only)
D - Universal Power Rail
E - Mounting Holes
F - DIN Rail
G - End Cap UPR-E
Figure 2
G
125 mm
A
B
CD
F
E
Note: The number of isolators per power supply dependsupon the power consumption of each module.
1415 120/240VAC
4 6
32
111GND
24VDC120/240VACL1 N
Power Rail Diagrams
Note: PR-02 and PR-05 is a 500 mm insert for standard35 mm DIN rail. Individual sections can be connectedwith a VE-PR link.
Note: The UPR-02 nd UPR-05 is two meters in length andcomes with its own 35 mm DIN rail.
PR-02/PR-05 UPR-02/UPR-05
Power Supply Power Supply
Note: The number of isolators per power supply dependsupon the power consumption of each module.
IS Application Guide
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Term
inal D
esi
gnati
on
Terminal Designation
Configuration
Figure 1 Figure 3
Figure 2 Figure 4
21
43
65
8 7
Please Reference AppropriateModel for Terminal Designation
7 8 9
1 2 3
13 14 1519 20 21
4 5 6
16 17 18 22 23 24
10 11 12
1 2 3 4 5 6
7 8 9
10 11 1213 14 15
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
1 2 3
4 5 6
7 8 9
10 11 12
1 2 3 4 5 6
7 8 910 11 12