Moore SSX User manual

206-792-00G
May 2016
User’s Manual
Demand Moore Reliability
SSX/SST
www.miinet.com
SSX/SST
Safety Series Isolator and Splitter
Safety Series Isolator and Splitter

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User’s Manual
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May 2016
Customer Support
Moore Industries is recognized as the industry leader in delivering top quality to its customers in products
and services. We perform a sequence of stringent quality assurance checks on every unit we ship. If any
Moore Industries product fails to perform up to rated specications, call us for help. Our highly skilled staff of
trained technicians and engineers pride themselves on their ability to provide timely, accurate, and practical
answers to your process instrumentation questions. Our headquarters and other facilities phone numbers
are listed below.
There are several pieces of information that can be gathered before you call the factory that will help our
staff get the answers you need in the shortest time possible. For fastest service, gather the complete model
and serial number(s) of the problem unit(s) and the job number of the original sale.
World Headquarters
16650 Schoenborn Street
North Hills, California
91343-6196, U.S.A.
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
TOLL FREE: 1-800-999-2900
www.miinet.com
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www.miinet.com
Demand Moore Reliability
Safety Series Isolator and Splitter
SSX/SST
Customer Support
Locations

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Safety Messages
Please read this manual in its entirety. It should answer most of your questions. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before installing, using, or maintaining
this product. Should you still have questions please visit our web site at www.miinet.com or contact any of our sales/
support ofces nearest you.
Your safety and the safety of others is very important. We have provided many important safety messages in this
manual. Please read these messages carefully. These safety messages alert you to potential hazards that could hurt
you or others or render damage to units.
All Moore Industries instrumentation should only be used for the purpose and in the manner described in this manual.
If you use this product in a manner other than that for which it was intended, unpredictable behavior could ensue with
possible hazardous consequences.
Each safety message is associated with a safety alert symbol. These symbols are found in the throughout the manual.
The denition of these symbols is described below:
Pay particular attention wherever you see the following symbols:
Note – Information that is helpful for a procedure,
condition or operation of the unit.
Caution – Hazardous procedure or condition that
could damage or destroy the unit.
Warning – Hazardous procedure or condition that
could injure the operator.
Qualied Personnel
The Moore Industries’ product/systems described in this manual may be operated only by personnel qualied for the
specic task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualied personnel are those who, based on their training and experience, are capable of identifying risks and avoiding
potential hazards when working with these Moore Industries’ products/systems.
Proper use of Moore Industries products
Moore Industries’ products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended or
approved by Moore Industries’ . Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible ambient
conditions must be complied with. The information in the relevant documentation must be observed.
We have reviewed the contents of this publication to ensure consistency with the hardware and/or software described.
Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the information in this
publication is reviewed regularly and any necessary corrections are included in subsequent editions. Specications and
information are subject to change without notice.
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them
does not imply any afliation with or endorsement by them unless otherwise specied.
Safety Series Isolator and Splitter
SSX/SST
About this Manual

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Table of Contents
Safety Series Isolator and Splitter
SSX/SST
Section 1 - Introduction 6
Overview....................................................................................................................6
Description................................................................................................................6
2-Wire, Loop Powered SSX......................................................................................................... 6
4-Wire Line/Mains Powered SST and SST Splitter ..................................................................... 6
Model Numbers and Options...................................................................................8
SSX 2-Wire Loop Powered Safety Isolator / Signal Convertor.................................................... 9
SST 4-Wire Line/Mains Powered Safety Isolator/Signal Convertor
(Single Output Channel)................................................................................................................ 10
SST 4-Wire Line/Mains Powered Safety Isolator Splitter
(Two Output Channels) ..................................................................................................................11
Section 2 - Calibration and Bench Check 13
Calibration...............................................................................................................13
Calibration Procedure - SSX and SST Single Output Channel ................................................. 14
SPAN and ZERO Adjustments - SSX and SST Single Output Channel .................................... 14
Calibration Procedure - SST Splitter (Two Output channels) .................................................... 16
SPAN and ZERO Adjustments - SST Splitter ............................................................................ 16
Bench Check...........................................................................................................18
Bench Check Procedure............................................................................................................ 19
Section 3 - Installation and Wiring 24
Terminal Designations ...........................................................................................24
Dimensions .............................................................................................................25
Electrical Connections ............................................................................................................... 27
Installation Category.................................................................................................................. 27
Installation in Hazardous Locations.....................................................................29
Special Conditions of Use ........................................................................................................ 29
CONTENTS

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Table of Contents
Safety Series Isolator and Splitter
SSX/SST
Section 4 - Operation and Maintenance 30
Operation.................................................................................................................30
Maintenance............................................................................................................30
Section 5 - Applications 31
Isolate and Pass Critical HART Data ....................................................................31
Isolate and Power a 2-Wire Transmitter ...............................................................32
Isolation of Safety Systems...................................................................................33
“Sharing” or “Splitting” Process Signals ............................................................34
Solve “Bucking” Power Supplies and Filter HART ............................................. 35
Solving 4-Wire Transmitter Problems...................................................................36
Duplicate Signal to Two Legacy Systems ............................................................37
Section 6 - SSX/SST in SIS 38
Functional Safety Description...............................................................................38
Failure Rate Data ....................................................................................................38
Product life..............................................................................................................38
Conguration..........................................................................................................38
Process Safety Time ..............................................................................................39
Input Types..............................................................................................................39
Broken Wire Detection...........................................................................................39
Proof Test Procedure .............................................................................................39
Repair and Replacement........................................................................................39
Section 7 - Specications 41
Section 8- Ordering Information 42
Warranty Disclaimer 43
CONTENTS

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Safety Series Isolator and Splitter
SSX/SST
SECTION 1
Section 1 - Introduction
The Moore Industries’ Safety Series Isolators (SSX and SST) are designed and manufactured to
provide a high level of availability for safety critical applications and for use as a component part
of a safety instrumented system.
This manual contains information needed to install, operate and maintain this product. When
the SSX or SST are used in a SIL rated safety application, please refer to Section 6 SSX/SST
in Safety Instrumented Systems. Safety and failure rate data for the SSX and SST are in the
SSX/SST FMEDA report (Moore Industries’ Document No: 700-702-36), which is available upon
request.
Overview
As part of the Moore Industries’ FS Functional Safety Series, the exida® approved, SIL 3
capable 2-wire (loop powered) SSX and 4-wire (line/mains powered) SST Safety Isolators and
Splitters provide galvanic isolation and signal conversion for your SIS (Safety Instrumented
System) needs. These units protect and enhance loops and also pass valuable HART® data
from the eld transmitter to host systems and vice-versa.
Description
2-Wire, Loop Powered SSX
The SSX is a 2-wire isolator /signal convertor, drawing power from the output side of the loop.
Typically, this is from a secondary receiving device such as a DCS or PLC. The SSX will also
pass through a HART signal on its input or optionally can block the signal on its output.
4-Wire Line/Mains Powered SST and SST Splitter
The SST is a 4-wire unit powered by 24DC, 117AC or 230AC. It is designed for applications
where line/mains power is readily available, such as the back of a panel or inside of a control
room. It passes through a HART signal on its input or optionally can block the signal on its
output. The SST can also provide 24V power to a 2-wire, output-loop powered instrument which
eliminates the need for an additional power supply.
The SST Splitter takes one input and creates two identical, completely isolated outputs.
Additionally, the SST can function as a HART splitter that passes valuable HART data to one or
both of the SST’s independent outputs. This is especially important when asset management
systems need to maintain a digital HART connection with critical valves or instruments for
diagnostic monitoring or calibration record keeping.

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SSX/SST
SECTION 1
Single- and Multiple-Unit Instrument Enclosures
Designed to meet NEMA 4X and IP66 ratings, the R-BOX is the perfect solution for protecting the
SST/SSX in field and control room applications. Rugged and versatile, it delivers a high impact
structure and resistance to ultraviolet rays and chemicals. The R-BOX mounts on a pipe, panel
or surface, and comes in a variety of widths to economically accommodate several SSTs or
SSXs. It features a pre-installed mounting rail; customizable conduit entry options; a clear cover
and a secure locking mechanism (See Figure 1.1). For more information, see the R-BOX Field-
Mount Enclosure datasheet.
Figure 1.1. Available in a variety of widths, our R-BOX field-mount instrument enclosure is designed to protect DIN-rail
instruments in even the most rugged environments
SSX and SST Applications
Please refer to Section 5: Applications for examples of typical SSX and SST applications

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Safety Series Isolator and Splitter
SSX/SST
SECTION 1
Model Numbers and Options
The following section provides details of the Moore Industries model number and the available
options for the SSX and SST.
Moore Industries model numbers or SSX/SST are structured as follows:
SSX / 4-20MA / 4-20MA / 12-42DC / -IZ250 [DIN]
Unit / Input / Output / Power / -Options [Housing]
Refer to Section 8 Ordering Information for a quick reference table of ordering information.
Further details are provided for each model starting on next page.

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SSX/SST
SECTION 1
SSX 2-Wire Loop Powered Safety Isolator / Signal Convertor
INPUT
4-20MA
The standard input of the SSX is 4-20mA into 100 ohms.
There are two options available that will change the input resistance. The – IZ250 option
will increase the input resistance to 250 ohms and the -0HART option (no HART pass-
through) will change the input resistance to 65 ohms.
1-5V
The SSX can also be ordered for use with a 1-5Vdc input (non-HART). The input
impedance for this application is 1 Megohm.
Note: Input resistance specifies the resistance seen by the DC signal. Since the HART signal
is AC, it will see the input resistance plus the internal HART transformer (70 ohms) plus any
termination resistance in the loop.
OUTPUT
4-20MA
Isolated 4-20mA into 0-600 ohms (with 24Vdc series loop voltage), with HART digital data
pass-through.
Note: There is no HART digital data pass-through at the output when the -0HART option is
chosen or when the 1-5V Input is chosen.
POWER
12-42DC
The SSX is a 2-wire, loop powered instrument. It is powered either by an external 12-
42Vdc power supply, or by a DCS (or PLC) input channel that provides power (12-42Vdc)
to the loop.
OPTIONS
-IZ250
This option increases the input resistance to 250 ohms. (4-20mA input units only)
-0HART
With this option the instrument is configured for no HART pass-through. (4-20mA input
units only)
HOUSING
[DIN]
Universal DIN-style housing mounts on a 32mm G-type rail (EN 50035) or on 35mm Top
Hat rail (EN50022).
[FLB]
Flange mount bracket for wall mounting.

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Safety Series Isolator and Splitter
SSX/SST
SECTION 1
SST 4-Wire Line/Mains Powered Safety Isolator/Signal Convertor
(Single Output Channel)
INPUT
4-20MA
The standard input of the SST is 4-20mA into 100 ohms.
There are two options available that will change the input resistance. The –IZ250 option
will increase the input resistance to 250 ohms and the -0HART option (no HART pass-
through) will change the input resistance to 65 ohms.
Note: Input resistance specifies the resistance seen by the DC signal. Since the HART signal
is AC, it will see the input resistance plus the internal HART transformer (70ohms) plus any
termination resistance in the loop.
1-5V
The SST can also be ordered for use with a 1-5Vdc input (non-HART). The input
impedance for this application is 1 Megohm.
OUTPUT
4-20MA
Isolated 4-20mA into 0-1000 ohms, with HART digital data pass-through.
Note: There is no HART digital data pass-through at the output when the -0HART option is
chosen or when the 1-5V Input is chosen.
POWER
24DC
117AC
230AC
The SST is a 4-wire, line/mains powered instrument. The voltage choice should be
specified at the time that the instrument is ordered. It can be powered by either 24Vdc (+/-
10%), 117Vac, 50/60Hz (+/- 10%) or 230Vac, 50/60Hz (+/- 10%). The SST with one output
channel consumes 3 watts maximum.
OPTIONS
-IZ250
This option increases the input resistance to 250 ohms. (4-20mA input units only)
-0HART
With this option the instrument is configured for no HART pass-through.
(4-20mA input units only)
HOUSING
[DIN]
Universal DIN-style housing mounts on a 32mm G-type rail (EN 50035) or on 35mm Top
Hat rail (EN50022).
[FLB]
Flange mount bracket for wall mounting

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SSX/SST
SECTION 1
SST 4-Wire Line/Mains Powered Safety Isolator Splitter
(Two Output Channels)
INPUT
4-20MA
The standard input of the SST is 4-20mA into 100 ohms.
There are three options available that will change the input resistance. The –IZ250 option
will increase the input resistance to 250 ohms, the -0HART option (no HART pass-through)
will change the input resistance to 65 ohms, and the -2HART option (HART pass-through
for both output channels) will change the input resistance to 135 ohms
Note: Input resistance specifies the resistance seen by the DC signal. Since the HART signal
is AC, it will see the input resistance plus the internal HART transformer (70 ohms) plus any
termination resistance in the loop. For -2HART option this will be the input resistance plus 140
ohms plus the termination resistances in both output loops.
1-5V
The SST can also be ordered for use with a 1-5Vdc input (non-HART). The input
impedance for this application is 1 Megohm.
OUTPUT
2X4-20MA
Two isolated 4-20mA channels into 0-600 ohms, with HART digital data pass through on
one output channel only (Output ”A”).
The -2HART option will provide isolated two isolated 4-20mA channels into
0-600 ohms, with HART digital data pass-through on both output channels.
If the –EP (External Power) option is selected both outputs will be powered by external
voltage sources connected in series.
Note: There is no HART digital data available at the output when the -0HART option is chosen or
when the 1-5V Input is chosen.
POWER
24DC
117AC
230AC
The SST is a 4-wire, line/mains powered instrument. The voltage choice should be
specified at the time that the instrument is ordered. It can be powered by either 24Vdc (+/-
10%), 117Vac, 50/60Hz (+/- 10%) or 230Vac, 50/60Hz (+/- 10%). The SST with two output
channels consumes 5 watts maximum.

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Safety Series Isolator and Splitter
SSX/SST
SECTION 1
OPTIONS
-IZ250
This option increases the input resistance to 250 ohms. (4-20mA input units only)
-0HART
With this option the instrument is configured for no HART pass-through. (4-20mA input
units only)
-2HART
With this option the instrument is configured for HART pass-through on both output
channels. (4-20mA input units only)
-EP
With this option both output channels will be powered by an external source.
-RO
With this option both output channels will be the reverse of the input eg. 4mA input would
be represented as 20mA on both outputs.
HOUSING
[DIN]
Universal DIN-style housing mounts on a 32mm G-type rail (EN 50035) or on 35mm Top
Hat rail (EN50022).
[FLB]
Flange mount bracket for wall mounting.

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Section 2 - Calibration and Bench Check
It is recommended that you perform a bench check on your instruments prior to installing them in
your application.
Calibration
We recommend that you check the calibration every year and re-calibrate only when necessary.
To calibrate the SSX or the SST, set up the equipment listed in Table 1 as shown in Figures 2.2
thru 2.4, as appropriate.
Table 1. Calibration Equipment for the SSX and SST
Current/Voltage
Calibrator Adjustable, calibrated to an accuracy of ±0.025% (Fluke Model 725, or similar)
Calibrated, regulated 24Vdc (±10%) source, nominal, for SSX or dc-powered SST;
calibrated, regulated 117Vac or 230Vac (±10%) source, nominal, for ac-powered SST
250 ohm with ±0.01% precision; required only if using a Voltmeter to calibrate the analog
output from the SST/SSX (voltage drop across the precision resistor; 4-20mA=1-5V)
Calibrated to an accuracy of ±0.025%, or better; such as Fluke Model 725, or similar
Standard (blade) head; head width 2.5mm (0.1in), maximum width
Device Specifications
Power Supply
Load Resistor
Multimeter
Screwdriver
All referenced product names are the sole property of their respective manufacturers .
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

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Calibration Procedure - SSX and SST Single Output Channel
Current Input Units
1. Apply the appropriate power to the unit being calibrated.
2. Set the INPUT simulator to 4mA.
3. Adjust the ZERO potentiometer (pot) on the SSX or SST front panel until the meter in the
calibration setup reads 1V, ±0.02V.
4. Adjust the INPUT to 20mA.
5. Adjust the SPAN pot on the SSX or SST front panel until the meter in the calibration setup
reads 5V, ±0.02V.
Note: SPAN and ZERO adjustments are non‑interactive as long as zero is set rst.
Voltage Input Units
1. Apply the appropriate power to the unit being calibrated.
2. Set the INPUT simulator to 1V.
3. Adjust the ZERO potentiometer (pot) on the SSX or SST front panel until the meter in the
calibration setup reads 1V, ±0.02V.
4. Adjust the INPUT to 5V.
5. Adjust the SPAN pot on the SSX or SST front panel until the meter in the calibration setup
reads 5V, ±0.02V.
Figure 2.1. SPAN and ZERO adjustments - SSX and SST Single Output Channel
SPAN
Potentiometer
Adjustment
ZERO
Potentiometer
Adjustment
SPAN
Potentiometer
Adjustment
ZERO
Potentiometer
Adjustment
SPAN
Potentiometer
Adjustments
ZERO
Potentiometer
Adjustments
SPAN and ZERO Adjustments - SSX and SST Single Output Channel
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

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Figure 2.3. Setting up to Calibrate the SST (Single Output Channel)
250ohm
4-20mA = 1-5V
VOLTMETER
+–
CURRENT/
VOLTAGE
CALIBRATOR
+
–
117 or
230Vac
+–
24Vdc
Power
OR
Figure 2.2. Setting up to Calibrate the SSX
250ohm
24Vdc
+
–
4-20mA = 1-5V
VOLTMETER
+
–
CURRENT/
VOLTAGE
CALIBRATOR
+
–
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

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Moore industries-International, Inc.
Figure 2.4. SPAN and ZERO adjustments - SST Splitter
SPAN
Potentiometer
Adjustment
ZERO
Potentiometer
Adjustment
SPAN
Potentiometer
Adjustment
ZERO
Potentiometer
Adjustment
SPAN
Potentiometer
Adjustments
ZERO
Potentiometer
Adjustments
SPAN and ZERO Adjustments - SST Splitter
Safety Series Isolator and Splitter
SSX/SST
SECTION 2
Calibration Procedure - SST Splitter (Two Output channels)
Current Input Units
1. Apply the appropriate power to the unit being calibrated.
2. Set the INPUT simulator to 20mA.
3. Adjust the SPAN pot on the SST Splitter front panel until the meter in the calibration setup
reads 5V, ±0.02V (1V, ±0.02V for -RO option units).
4. Adjust the INPUT to 4mA.
5. Adjust the ZERO potentiometer (pot) on the SST Splitter front panel until the meter in the
calibration setup reads 1V, ±0.02V (5V, ±0.02V for -RO option units).
6. Re-check SPAN at 20mA, adjust if needed; re-check ZERO.
7. Repeat steps 2 to 6 for the second output channel.
Note: SST Splitter SPAN and ZERO adjustments are non‑interactive as long as span is set rst.
Voltage Input Units
1. Apply the appropriate power to the unit being calibrated.
2. Set the INPUT simulator to 5V.
3. Adjust the SPAN pot on the SST Splitter front panel until the meter in the calibration setup
reads 5V, ±0.02V (1V, ±0.02V , for -RO option units).
4. Adjust the INPUT to 1V.
5. Adjust the ZERO potentiometer (pot) on the SST Splitter front panel until the meter in the
calibration setup reads 1V, ±0.02V (5V, ±0.02V for -RO option units).
6. Re-check SPAN at 20mA, adjust if needed; re-check ZERO.
7. Repeat steps 2 to 6 for the second output channel.

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-EP Option Wiring
250ohm
VOLTMETER
+–
250ohm
OUTPUT A
OUTPUT A
4-20mA = 1-5V
250ohm
VOLTMETER
+–
OUTPUT B
OUTPUT B
4-20mA = 1-5V
+
–
VOLT
METER VOLT
METER
DC
SUPPLY
12-42V
+
–
+
–
250ohm
CURRENT/
VOLTAGE
CALIBRATOR
+
–
CURRENT/
VOLTAGE
CALIBRATOR
+
–
117 or 230Vac
+
–
24Vdc
Power
24Vdc
Power
24Vdc
Power
OR
Figure 2.5. Setting up to Calibrate the SST Splitter (Two Output Channels)
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

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Bench Check
If you are using HART devices in conjunction with your SSX or SST we highly recommend that
you perform a bench check of the devices prior to installing them in the eld. Doing this will
ensure that they are operating within your expectations or requirements.
Table 2. Bench Check Equipment for the SSX and SST
Use your HART slave device(s) that will be used for your final installation.
HART Communicator Model 275 or equivalent. Device used should be capable
of reading a valid HART signal (and 4-20mA analog signal).
Calibrated, regulated 24Vdc (±10%) source, nominal, for SSX or dc-powered SST;
calibrated, regulated 117Vac or 230Vac (±10%) source, nominal, for ac-powered SST
250 ohm with ±0.01% precision; required only if using a Voltmeter to calibrate the analog
output from the SST/SSX (voltage drop across the precision resistor; 4-20mA=1-5V)
Calibrated to an accuracy of ±0.025%, or better; such as Fluke Model 725, or similar
Standard (blade) head; head width 2.5mm (0.1in), maximum width
Device Specifications
HART Slave
Device
HART
Communicator
Power Supply
Load Resistor
Multimeter
Screwdriver
All referenced product names are the sole property of their respective manufacturers .
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

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Bench Check Procedure
SSX Bench Check
1. Connect your SSX as shown in Figure 2.6.
2. Using your HART Communicator verify that you can read HART data on the Input side of
the SSX.
3. Using your HART Communicator verify that you can read HART data on the Output side of
the SSX.
Note: If your SSX has the -0HART option verify that there is no HART data on the Output side of
the SSX.
4. With your HART Communicator connected to the Output side of the SSX send a HART
command to your HART slave device to verify that the HART signal will pass from the
SSX’s Output side to the SSX’s Input side (except units with the -0HART option).
5. Remove the power supply from the Output side of the SSX and verify that the HART signal
is still active on the Input side.
Figure 2.6. Bench Check setup for the SSX
Smart
HART
Transmitter
(Loop-powered)
–
+
4-20mA + HART
24Vdc
Power
OPTIONAL
HART
COMMUNICATOR
4-20mA + HART
+–
DCS,
PLC, etc.
*
+
–
DCS,
PLC, etc.
*
+
–
OPTIONAL
HART
COMMUNICATOR
*Each set up can only have
2 HART Masters, one designated
as primary and one as secondary.
For the HART signal to operate,
there needs to be a loop resistance
of 250 to 1100 ohms. If a HART
Master does not have an integral
termination resistor, then a
250 ohms resistor should be added
in the loop.
Safety Series Isolator and Splitter
SSX/SST
SECTION 2

www.miinet.com Moore Industries-International, Inc.
- 20 -
User’s Manual
206-792-00G
May 2016
Moore industries-International, Inc.
SST (Single Output Channel) Bench Check
1. Connect your SST (Single Output Channel) as shown in Figure 2.7, 2.8 or 2.9.
2. Using your HART Communicator verify that you can read HART data on the Input side of
the SST.
3. Using your HART Communicator verify that you can read HART data on the Output side of
the SST.
Note:If your SST (Single Output Channel) has the -0HART option verify that there is no HART
data on the Output side of the SST.
4. With your HART Communicator connected to the Output side of the SST send a HART
command to your HART slave device to verify that the HART signal will pass from the
SST’s Output side to the SST’s Input side (except units with the -0HART option).
5. Remove the power supply from the SST and verify that the HART signal is still active on
the Input side (except when using the TX terminal to power your HART slave device).
Smart
HART
Transmitter
(powered)
+ –
+
+INTX
–
4-20mA + HART
OPTIONAL
HART
COMMUNICATOR
OPTIONAL
HART
COMMUNICATOR
4-20mA + HART
117 or 230Vac
+
–
24Vdc
Power
OR
DCS,
PLC, etc.
*
*Each set up can only have
2 HART Masters, one designated
as primary and one as secondary.
For the HART signal to operate,
there needs to be a loop resistance
of 250 to 1100 ohms. If a HART
Master does not have an integral
termination resistor, then a
250 ohms resistor should be added
in the loop.
Figure 2.7. Bench Check Setup for SST (when using the SST -TX terminal to power your HART transmitter)
Safety Series Isolator and Splitter
SSX/SST
SECTION 2