Model 231 Multi-Sense®
ISO
✓
Certified
9001:
2000
Wet-to-Wet Pressure Transducer
CECE
CE
CECE
RoHS
SS231 Rev B 04/26/07
1
5.0 OPERATION
Range Selection Switch
Auto Zero Button
Electrical Output
Configurator
Contents
A B C D
RANGES
MS1 50 25 10 5
MS2 100 50 20 10
MS3 250 125 50 25
+
EXC.
-
+
4-20 MA
Electrical Connections
ZERO
ABCD
+
-
COMOUT
REMOTE ZERO
A B C D
OUTPUT
ABCD
4-20 0-5 0-10 1-5
Figure 6
BAR
A.REV
SLOW
BI-DIR
SWAP
PSI
NORM
FAST
UNI-DIR
NORM
Range Selection Switch: The unit is set to the highest range when calibrated at
the factory. To select the other ranges, slide the switch to the right.Important:
Push “zero” button after installing the Model 231, and after changing range.
Auto Zero Button: Press and hold the “ZERO” push-butt on for 2 seconds to
automatically reset zero or provide contact closure on “Remote Zero, see figure 4,
pg. 8, and figure 5, pg. 9 .
Electrical Output: The unit is set at the factory to 4-20 mA. To select another
output, move the slide switch to the right.
Electrical Connections: Electrical termination for power supply, 3-wire voltage
output and 2-wire true 4-20 mA current output, and remote zero wiring.
BAR/PSI: Jumper selectable engineering units in Bar ranges or PSI.
A. REV/NORM:
A.REV: Analog Reverse: When in reverse mode, the output increases when the
differential pessure decreases and decreases as pressure increases.
NORM: When in Normal mode output increases as pressure increases and
decreases as pressure decreases.
SLOW/FAST: When Slow mode is selected, 5-second averaging is provided for
surge damping.
BI-DIR/UNI-DIR: Select UNI-Directional or BI-Directional mode.
Unidirectional mode measures from 0 to full scale differential pressure.
Bidirectional mode measures pressure from minus 1/2 of full scale to plus 1/2 of
full scale differential pressure. Output will read 1/2 full scale when differential
pressure is zero.
SWAP/NORM: Jumper selectable Port Swap feature eliminates costly replumbing
when incorrectly installed or replaced. Go from NORMAL to SWAP and the jumper
makes the “HI” Port “LO” and the “LO” port “HI.
1.0 GENERAL INFORMATION...................................................................... 4
2.0 MECHANICAL INSTALLATION ............................................................. 4
2.1 Media compatibility........................................................................ 4
2.2 Environment...................................................................................... 4
2.3 Pressure Fittings............................................................................... 5
2.4 Mounting............................................................................................ 5
2.5 Installation Procedures.................................................................. 5
3.0 OPTIONAL 3-VALVE MANIFOLD PROCEDURE............................... 6
4.0 ELECTRICAL INSTALLATION................................................................. 8
4.1 Electrical Termination
Wiring: 2-Wire , 4 to 20 mA and Remote Zero............................. 8
4.2 Electrical Termination
Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero........ 9
5.0 OPERATION..............................................................................................10
10
3
Model 231
Installation Guide
Multi-Sense® Model 231 Series
Wet-to-Wet Differential Pressure Transducers
4.2 Electrical Termination
Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero
The Model 231 when configured for voltage output is a 3-wire circuit device with
three terminals available for wiring. The -Excitation and -Output are commoned
on the circuit.
1.0 GENERAL INFORMATION
Every Model 231 has been calibrated and tested before shipment to guarantee
performance of all pressure ranges.
The Model 231 has field selectable unidirectional and bidirectional pressure
ranges, configurable 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. The Model 231 is factory
calibrated to the highest pressure range. The range label on the side of the unit
indicates the factory calibrated range.
Setra Systems 231 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 231 Multi-Sense pressure transducer has been ordered in one of the
following versions:
Version Unidirectional Bidirectional
MS1 5, 10, 20, 50 psid ±5, ±10, ±20, ±50 psid
MS2 10, 20, 50, 100 psid ±10, ±20, ±50, ±100 psid
MS3 25, 50, 125, 250 psid ±25, ±50, ±125, ±250 psid
The 231 can operate from 12-30 VDC, 24 VAC nominal output power supply.
Note: The Zero terminals, connected to digital output, provide a contact closure relay for automatic reset to zero pressure
by the monitoring system. CAUTION: ZERO input is for dry contact, do no apply voltage to ZERO Terminals
The optional remote zero is commoned on the circuit to the -com and the digital
output is wired to the terminal to the right..
A B C D
OUTPUT
ABCD
4-20 0-5 0-10 1-5
BAR
A.REV
SLOW
BI-DIR
SWAP
PSI
NORM
FAST
UNI-DIR
NORM
Power Supply
12-24 VAC/DC
A B C D
RANGES
ABCD
MS1 50 25 10 5
MS2 100 50 20 10
MS3 250 125 50 25
+-+
COMOUT
EXC.
+
+
+
ZERO
Contact Closure Relay
2.0 MECHANICAL INSTALLATION
2.1 Media compatibility
Model 231 transducers are designed to be used with any gas or liquid compatible with 17-4 PH stainless steel, The optional 3-valve manifold assembly is
designed to be used with gases or liquids compatible with 360 Brass, Acetal plug
valves and Nitrile O-Rings. Never totally submerge the unit in any liquid.
2.2 Environment
The operating temperature limits of the 231 are as follows:
Compensated T emperature Range °F (°C) +32 to +130 (0 to +54)
Operating Temperature Range °F (°C) -4 to +185 (-20 to +85)
Storage T emperature Range °F (°C) -4 to +185 (-20 to +85)
4
Digital Control
Voltage
Remote Zero
Digital Output
+
Figure 5
9
4.0 ELECTRICAL INSTALLATION
To access the electrical connections, turn the screws on the top of the case
counter clockwise until the hinged cover can be flipped up. The screws are
captured and secured in the cover. Wiring is through the 1/2” conduit opening.
Both current and voltage outputs are reverse wiring protected.
Note: The Zero terminals, connected to digital output, provide a contact closure relay for automatic reset to zero pressure
by the monitoring system. CAUTION: ZERO input is for dry contact, do no apply voltage to ZERO Terminals
2.3 Pressure Fittings
Typically standard pipe fittings and installation procedures should be used.
The Model 231 has 1/8” −NPTF internal fittings. The high pressure port and low
pressure port are located on the bottom of the unit , labeled “HI” and “LO”, respec-
tively. The optional 3-valve manifold assembly is supplied with 1/4”–18 NPT
internal fittings.
4.1 Electrical Termination
Wiring: 2-Wire - 4 to 20 mA (Current Output) and Remote Zero
Model 231 when configured as a current output transducer is a true 2-wire, 4-20
mA current output device and delivers rated current into any external load of
0-1000 ohms.
When configured as a 4-20 mA current output device the current flow is in one
direction only. PLEASE OBSERVE POLARITY.
We suggest that an electrical cable shield be connected to the system’s loop
circuit ground to improve electrical noise rejection.
Min. Supply Voltage: 12 + .02 x (Resistance of receiver plus line)
Max. Supply Voltage: 30 + .004 x (Resistance of receiver plus line)
The optional remote zero is wired on the circuit to the -com and the digital
output is wired to the terminal to the right.
A B C D
RANGES
ABCD
MS1 50 25 10 5
MS2 100 50 20 10
MS3 250 125 50 25
+
EXC.
+
-
COMOUT
ZERO
A B C D
OUTPUT
ABCD
4-20 0-5 0-10 1-5
BAR
A.REV
SLOW
BI-DIR
SWAP
PSI
NORM
FAST
UNI-DIR
NORM
+
Moisture Precautions
The Model 231 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 231.
2.4 Mounting
The Model 231 can be easily mounted using the two mounting screws located
on the side of the unit.
2.5 Installation Procedures
If the Model 231 is supplied with an optional 3-valve Manifold assembly, refer to
section 3.0, Optional 3-Valve Manifold Assembly Procedure, for further installation
procedures. If the Model 231 is not supplied with a Setra 3-Valve manifold, the
following installation procedure is recommended.
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.
High
Valve A
Low
Valve B
Power Supply
12-24 VAC/DC
Digital Control
Current
(4-20 mA)
Remote Zero
Digital Output
Valve C
+
Contact Closure Relay
Low
Valve 1 = High Side Valve
Valve B = Low Side Valve
Valve C = Shunt Valve
8
Figure 4
High
Differential
Pressure Sensor
Figure 1
5
Model 231
Differential
Pressure Transducer
V1
Model 231 - Outline Drawing
6.0
V3
Shunt Valve
Shut Off Valves
V2
3-Valve Manifold Description
Manifold Block Brass
Valves (3) V1 for connection to + port
V2 for connection to - port
V3 for equalizing pressure
Valve Type 90 degree On/Off
Process Connections 1/4-18NPT Internal Thread
R 0.1
2
152
5.6
141
High Process
Connection
1/8-NPT
Low Process
Connection
1/8-NPT
Figure 2
3.0 OPTIONAL 3-VALVE MANIFOLD PROCEDURE
The 3-Valve Manifold Assembly is normally shipped with valves V1 and V2 closed
and V3 open.
To Place the 231 into service:
1. Confirm valves V1 and V2 are closed and valve V3 is open.
2. Mount the manifold and install process connections.
3. Slowly open V2, then V1.
4. Close the V3 valve.
To Take the 231 out of Service
1. Open V3 to equalize the pressure at the Model 231.
2. Close the V1 and V2 valves.
0.3
9
2.0
51
4.0
102
Side View
4.6
117
4.8
122
1.6
40
1.2
31
1.7
42
2.0
51
Front View
5.2
131
1/8” NPTF
1.0
24
1/2” Conduit Opening
Bottom View
in.
Figure 3
6
7
mm
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