Setra Systems 231RS Operating Instructions Manual
Model 231RS
Operating Instructions
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
Table of Contents
1.0 General information ....................................................................................................... 3
2.0 Mechanical installation ................................................................................................ 4
2.1 Media compatibility ...................................................................................................4
2.2 Environment ...............................................................................................................4
.......................................................................................................... 4
2.4 Mounting .................................................................................................................... 4
2.5 Installation procedures ............................................................................................. 4
3.0 Electrical installation ..................................................................................................... 7
3.1 Electrical termination
Wiring: 2-wire, 4 to 20 mA, and Remote zero ........................................................... 7
3.2 Electrical terminations
Wiring: 3-wire, 0 to 5, 0 to 10, 1-5VDC, and Remote zero ....................................... 8
3.3 Remote sensors installation ..................................................................................... 9
.............................................................................................................. 13
5.0 Return products for repair ...........................................................................................14
6.0 Warranty & limitation of liability .................................................................................. 15
2
231RS w/ Conduit
231RS w/ Cable
231RS w/ Armored Cable
is shipping with the following:
Conduit Version
(231GRSX3MX)
Item Qty. Item Qty. Item Qty.
Housing 1 Housing 1 Housing 1
Pressure transducers 2 Pressure Transducers 2 Pressure Transducers 2
User Manual 1 Cable Assemblies 2 Cable Assemblies 2
Cable Version
(231GRSX4MXXX)
User Manual 1 User Manual 1
Armored Cable Version
(231GRSXAJXXX)
1.0 General information
Every Model 231RS has been calibrated and tested before shipment to guarantee performance
of all pressure ranges.
The Model 231RS has eld selectable unidirectional and bidirectional pressure ranges,
congurable 0 to 5 VDC, 0 to 10 VDC , and 1 to 5 VDC output, true two-wire 4 to 20 mA
output, and auto-zero capability. Each unit is factory calibrated to the highest pressure range.
The range label on the side of the unit indicates the factory calibrated range. Reminder: Your
application’s highest line pressure should be less than or equal to the highest pressure
range of the 231RS range code you selected when you purchased the 231RS. See Range
Codes in table below. (Range codes also listed on inside of housing cover).
Model 231RS pressure transducers sense differential pressure and convert this difference
in pressure to a proportional high level analog output for unidirectional and bidirectional
pressure ranges.
Your Model 231RS Multi-Sense pressure transducer has been ordered in one of the following
versions:
Version Unidirectional Bidirectional
RS1 5, 10, 25, 50, psid ±5, ±10, ±20, ±50, psid
RS2 7.5, 15, 37.5, 75 psid ±7.5, ±15, ±37.5, ±75 psid
RS3 10, 20, 50, 100 psid ±10, ±20, ±50, ±100 psid
RS4 15, 30, 75, 150 psid ±15, ±30, ±75, ±150 psid
RS5 25, 50, 125, 250 psid ±25, ±50, ±125, ±250 psid
3
2.0 Mechanical installation
2.1 Media compatibility
Model 231RS transducers are designed to be used with any gas or liquid compatible
with 17-4 PH stainless steel. Never totally submerge the unit in any liquid.
2.2 Environment
The operating temperature limits of the Model 231RS are as follows:
Compensated temperature range °F(°C) ±30 to +130 (0 to +54)
Operating temperature range °F(°C) -4 to +185 (-20 to +85)
Storage temperature range °F(°C) -4 to +185 (-20 to +85)
2.3 Pressure tting
Typically standard pipe ttings and installation procedures should be used.
Model 231RS have 1/4” -18” NPT male ttings. The high pressure port and low pressure
connections are located on the bottom of the unit, labeled “HI(+)” and “LO(-)” respectively.
Important:
Each remote sensor is labeled “HIGH PRESSURE SENSOR” or “LOW PRESSURE SENSOR”.
Match up the high pressure sensor to the high pressure electrical terminals, and the low
pressure sensor to the low pressure electrical terminals. Otherwise, the performance may not
meet the product linearity specications.
Moisture precautions:
The Model 231RS is provided with a 0.875” DIA. conduit opening for electrical termination,
intended for a 1/2” I.D. conduit connection. This opening must be sealed according to standard
industry practices in order to prevent moisture ingress into the Model 231RS.
2.4 Mounting
The Model 231RS can be easily mounted using the two mounting screws located on the side
of the unit.
2.5 Installation procedures
For differential pressure measurements at high line pressure, it is recommended that the
pressure sensor be installed with a valve in each line, plus a shunt valve across the high and
low (reference) pressure ports as shown.
Important:
Do not exceed maximum range pressure with the total of differential pressure and line
pressure.
4
Model 231RS
Low Pressure
Remote Sensor
Valve A
High Pressure
Remote Sensor
1
High
Valve A = High side valve
Valve B = Low side valve
1
Valves not included.
PipePipe
Figure 1
Model 231RS (Conduit version, P/N: 231GRSX3MXXX) - Outline drawing
6.0
(152.4)
5.56
(141.2)
R 0.1
(2.5)
0.35
(8)
2.0
(50.8)
Valve B
Low
1
1.98
(50.3)
Side view
4.0
(10.2)
1/2” Conduit
Opening
1.56
(39.6)
Figure 2
5
Front view
1.220
(30.99)
5.16
(131.1)
Bottom view
1.240
(31.50)
2x
0.864
(21.95)
0.95
(24.1)
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