Johnson Controls 231 Catalog Page

Multi-Sense® - Model 231

Wet-to-Wet, Differential,

Multi-Configurable Pressure Transducer

Applications

● Energy Management Systems

● Process Control Systems

● Flow Measurement of

Various Gases or Liquids

● Liquid Level Measurement of

Pressurized Vessels

● Pressure Drop Across Filters

Features

■ Field Selectable Output

■ True 4 to 20 mA Output and

0-5, 1-5, and 0-10 VDC Output

■ Field Selectable Pressure

Ranges

■ Field Accessible Push-

Button Zero and Remote Zero

■ Dual Sensors

■ Hinged Cover

■ Field Selectable Port Swap

■ Optional LCD Display

■ All Cast Aluminum, NEMA 4

Rated Housing

■ Meets

■ RoHS Compliant

CECE

CE Conformance

CECE

Standards

etra’s Model 231 Multi-Sense® Wet-to­Wet differential pressure transducer all-

S

inclusive design provides users with
field accessible ranging, choice of output and
field zeroing.

Choose from three configurable Model 231
pressure transducers: 5 up to 50 psid, 10 up to
100 psid, or 25 up to 250 psid. Each Model 231
has 4 unidirectional and 4 bidirectional switch
selectable pressure ranges and can be
reconfigured in the field for 0-5 VDC, 1-5 VDC,
0-10 VDC, or 4 to 20 mA output. (The 4 to 20 mA
output is operable as a true 2-wire device.) The
Model 231 jumper selectable port swap fea­ture eliminates costly replumbing if the
pressure transducer is improperly installed or
replaced. An optional LCD display is available
for on-site indication of line and differential
pressure.

The Model 231 is designed with Setra’s own
dual pressure sensors, which incorporate thin
film sensing technology. This technology
offers exceptional thermal accuracy and signal
linearity. Utilizing this technology, the Model
231 is resistant to long-term drift caused by
dopant migration and Fermi-level effects,
intrinsic in piezoresistive and silicon based
technologies, which are exaggerated at
elevated temperatures and by extended
pressure cycling.

3-VALVE MANIFOLD

The Model 231 can be supplied with an
optional 3-Valve Manifold assembly for ease of
installation and maintenance. The 3-Valve
Manifold is a machined
brass body requiring no in­ternal pipe connections,
thereby eliminating the risk
of internal leaks. The mani­fold’s rugged, yet compact,
construction requires mini­mum space for installation
and use. If the Model
231 is ordered with the 3-Valve Manifold, the
system is shipped completely assembled and
ready for wall or pipe mounting. (Order as

Pressure Fitting Code 3V.)

“ A ll-in-One”

8 Selectable Ranges...One Transducer

NOTE: Setra quality standards are based on ANSI-Z540-1.
The calibration of this product is NIST traceable.

Patent Pending

Benefits

■ Hinged Cover for Easy

Access to Switch Selectable
Features

■ Dual Pressure Sensors Provide

Independent High and
Lo Pressures

■ Optional LCD Display for

In-Situ Viewing of Hi, Lo, and
Differential Pressure

■ Field Calibration Saves Time

and Money

■ Port Swap Feature Eliminates

Replumbing Existing
Installations

■ Reduces Inventory

■ Saves Installation Cost

ISO

9001:
2000

Certified

✓

Performance Data

Accuracy RSS* (at constant temp.)
Pressure Ranges A, B, C ±1.0% FS
Pressure Range D ±2.0% FS

Pressure Ranges

AB C D
MS1 50 25 10 5
MS2 100 50 20 10
MS3 250 125 50 25

Thermal Effects

**

Compensated Range °F (°C) +32 to +130 (0 to +54)
Zero Shift %FS/100°F (50°C) 2.0 (1.8)
Span Shift %FS/100°F(50°C) 2.0 (1.8)

Warm-up Shift <0.12% FS
Response Time 1 to 5 sec. (selectable)
Maximum Working Pressure Maximum Range of

Pressure Ordered
Proof Pressure 2.2 x Full Scale
Burst Pressure 40 x Full Scale
*

RSS of Non-Linearity, Non-Repeatability and Hysteresis.
**Units calibrated at nominal 70°F. Maximum thermal error computed from
this datum.

Pressure Media

Liquids or Gases Compatible with 17-4 PH Stainless Steel

Note: Hydrogen not recommended for use with 17-4 H stainless steel.

Model 231 Specifications

Environmental Data

Temperature
Operating* °F (°C) -4 to +185(-20 to +85)
Storage °F (°C) -4 to +185(-20 to +85)
Vibration 10g from 50 Hz to 2000 Hz
Shock 200g

*Operating temperature limits of the electronics only.

Pressure media temperatures may be considerably higher or lower.

Physical Description (Model 231)

Case Die Cast Aluminum, Powder Coated
Pressure Fittings 1/8-18 NPT Internal
Electrical Connection 1/2 in. Conduit
Size 4.0 x 6 x 2 in.

(102 x 152 x 51mm)
Weight 1.5 lb
Sensor Cavity Volume 0.2 cc

Electrical Data (Voltage)

Circuit 3-Wire
Excitation 12 to 30 VDC/18 to 28 VAC

(Reverse Excitation Protected)

Output* 0 to 5 VDC

0 to 10 VDC

1 to 5 VDC
Output Impedance 30 Ohms
Current Consumption 4 mA (typ.) at 5 VDC

5 mA (typ.) at 10 VDC

40 mA (typ.) at 18-28 VAC

*Calibrated into a 50K Ohm load, operable into a 5000 ohm load or greater.

Electrical Data (Current)

Circuit 2-Wire

(Reverse Excitation Protected)

*

Output

4 to 20 mA, Clipped and

Capped
External Load 0 to 1000 Ohms
Minimum supply voltage (VDC) = 12 + 0.02 x
(Resistance of receiver plus line).
Maximum supply voltage (VDC) = 30 + 0.004 x
(Resistance of receiver plus line).

*Calibrated at factory with a 24 VDC loop supply voltage and a 250 ohm load.

3-Valve Manifold Assembly*

Physical Description

Manifold Block Brass
Valves (3) V1 for Connection to +Port

V2 for Connection to –Port

V3 for Equalizing Pressure
Valve Type 90° On/Off
Process Connections 1/4-18 NPT Internal Thread
Dimensions 6” x 11” (152mm x 279mm)
Weight 3 lbs.

*Order assembled with the Model 231 (Code 3V) or order separately as
Accessory 231900-01.

Specifications subject to change without notice.

Outline Drawing

6.0

152

5.6

141

R 0.1

2

0.3
9

Ranges

While we provide application assistance on all Setra products, both
personally and through our literature, it is the customer’s responsibility
to determine the suitability of the product in the application.

1.2
31

5.2

131

1.6
40

2.0
51

1/2” C onduit
Opening

1.7
42

Part Number Description

DPT231-MS1 5, 10, 25 50 psid / ±5, ±10, ±25, ±50 psid
DPT231-MS2 10, 20, 50, 100 psid / ±10, ±20, ±50, ±100 psid
DPT231-MS3 25, 50, 125, 250 psid / ±25, ±50, ±125, ±250 psid
DPT231-MS1-V 5, 10, 25 50 psid / ± 5, ±10, ±25, ±50 psid with 3-Valve Manifold
DPT231-MS2-V 0, 20, 50, 100 psid / ±10, ±20, ±50, ±100 psid with 3-Valve manifold
DPT231-MS3-V 25, 50, 125, 250 psid / ±25, ±50, ±125, ±250 psid with 3-Valve Manifold
DPT231-MS1-D 5, 10, 25 50 psid / ± 5, ±10, ±25, ±50 psid, LCD
DPT231-MS2-D 0, 20, 50, 100 psid / ±10, ±20, ±50, ±100 psid, LCD
DPT231-MS3-D 25, 50, 125, 250 psid / ±25, ±50, ±125, ±250 psidLCD
DPT231-MS1-V-D 5, 10, 25 50 psid / ±5, ±10, ±25, ±50 psid with LCD and 3-Valve Manifold
DPT231-MS2-V-D 10, 20, 50, 100 psid / ±10, ±20, ±50, ±100 psid with LCD and 3-Valve Manifold
DPT231-MS3-V-D 25, 50, 125, 250 psid / ±25, ±50, ±125, ±250 psid with LCD and 3-Valve Manifold

Code all blocks in table.

ORDERING INFORMATION

High Low

1/8” NPTF

1.0
24

2.0
51

4.0

102

MM

4.6

117

4.8

122

IN

SSP231 Rev. B 04/18/07