Print 
Email 
1831-2-RA-S | Dwyer Instruments | Pressure
Differential Pressure Switch, Manual Reset, DPDT, Activate On Increase, Silicone Diaphragm, Range 7.5-23 W.C.
Brand:Dwyer Instruments
MPN:1831-2-RA-S
SKU:1831-2-RA-S
List Price:
$472.00
Today's Price:
$245.44
product specifications
Contact Rating
4 A
Contact Type
DPDT
Accuracy
±4.00%
Approvals
RoHS
Connection
1/8 in NPT
Direction
Uni-Directional
Housing Material
Metallic
Measurement
Inches of Water Column
Media Compatibility
Liquid/Gas
Override
Manual
Range
±50 in WC
Supply Voltage
250 VAC
Type
Adjustable
Power Required
Switch
Set Point Range
7.5-23 in
product series specifications
Supply Voltage: Not required
Contact Type: 2-SPDT, Actuates on µP increase, Operates simultaneously within 1ms
Contact Rating: 4A Resistive @ 120-250 VAC
5A Resistive @ 30 VDC
Setpoint (SP): Adjustable range w/slotted screw in stub
1831-1: 2.5 to 9 psi WC
1831-2: 7.5 to 23 psi WC
Differential: None; Manual reset
Repeatability: ±4% max
Reset Manual: Reset
Visual Indication Switch: Left - Not tripped, Switch right - Tripped
Sensor Type Diaphragm: (Vertically mounted)
Operating Pressure Range: 0 to 1.2 psi WC (See ordering)
Overpressure (Burst): 25 PSIG (172kPa)
Max Operating Pressure (Proof): 10 PSIG (69kPa)
Operating Temperature: -30° to 180°F (-34° to 82°C)
Operating Humidity: <80% Non-condensing
Wetted Parts: Not Specified
Media Compatibility: Inert dry air
Process Connection: Two (Hi & LO), 1/8" FNPT
Wiring Terminations: 6 screws, 14 to 30 AWG
Mounting Included: L-bracket or 1/8" FNPT process connections
Vertical diaphragm orientation
Enclosure Rating: Steel, NEMA 1
Dimensions: 4.1"W x 4.1"H x 4.4"D, (10.3 x 10.3 x 11.1 cm)
Weight: 1.3 lb (0.6 kg)
Approvals: CE
Warranty: 1 year
product series features
- No power required
- DPDT switch with manual reset
- Two conduit connections for easy wiring
- Adjustable setpoint
- L Bracket mounting
more information & related documents
Series Description
The Dwyer 1831 Series differential pressure switches are available with a DPDT switch and manual reset. The 1831 combines small size with 4% set point repeatability. Absolutely no power is required to operate the DPDT switch. Set point adjustment on the switch is easily accessible for modifying the set point. The 1831 Series DPDT low differential pressure switches with manual reset eliminate common problems associated with typical high duct static cutout installations. Since the 1831 requires absolutely no power to drive its outputs, a separate power loop and its associated additional wiring and conduit is alleviated, reducing material and labor installation costs. Both control contacts of the 1831 Series activate at the same time. The potential of the lead switch shutting down the fan preventing the lag switch from sending an alarming signal to the DDC is no longer a probable system liability. Potential costly maintenance calls are diminished. Unlike typical switches that posses only a single conduit entry for both control loops, the 1831 Series provides two conduit connections simplifying wiring while eliminating additional conduit tees. The 1831 Series specifications and features make it the superior choice for high duct static cutout applications.
Kele Description
DIFF PRESS SW, ADJUST, 7.50-23.00" WC
Manufacturer
Dwyer Instruments
Related Documents
1831 Series Specifications - Installation and Operating Instructions 
