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Differential Pressure Switches RFS-4001

Differential Pressure Switches


The Model RFS-4001-025 and Model RFS-4001-031 Differential Pressure Switches are general purpose, airflow-proving switches designed for HVAC and building automation applications. These switches may be used to sense positive, negative, or differential air pressure. The plated housing contains a diaphragm, calibration spring and snap-acting switch. The Model RFS-4001-025 pressure connections located on each side of the diaphragm, accept copper or flexible 1/4" OD tubing. The Model RFS-4001-031 has tri-barb connectors that accept 1/8", 1/4", and 5/16" ID flexible tubing. An enclosure cover guards against accidental contact with the live-switch terminal screws and the set point-adjusting screw. The enclosure will accept a 1/2" conduit connection.


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QtyModelDescriptionIn StockList PriceInternet Price
RFS-4001-025 0.15 TO 5.0 IN WC, COMPR. FITTINGSIn Stock96.0053.76
RFS-4001-025-C 0.15 TO 5.0 IN WC, COMPR., KELE CALIBIn Stock96.0053.76
RFS-4001-031 DIFF PRESS SW, ADJUST, 0.15-5.00" WCIn Stock96.0053.76
RFS-4001-031-C DIFF PRESS SW, ADJUST, 0.15-5.00" WCIn Stock96.0053.76
RFS-4001-092 DIFF PRESS SW, ADJUST, 0.15-5.00" WCIn Stock58.7332.89


No accessories found
  • Two-year warranty
  • Adjustable setpoint
  • Knockout for 1/2" conduit
  • Enclosed terminals
  • Compression or barb fittings

Supply Voltage: Not required

Contact Type: SPDT

Contact Rating: 300 VA pilot duty @ 115-277 VAC,

 :5A non-inductive to 277 VAC

Setpoint (SP):(025, 031) Adjustable from 0.15 to 5.0″ WC w/ screw

Dial Pressure Gauge: (092) Adjustable from 0.15 to 2.0″ WC w/ screw

Differential :

Model:See model number

(025, 031) Progressive by SP from 0.05″ to 0.3″ WC:

(092) Progressive by SP from 0.05″to 0.2" WC:

Reset Automatic: reset by differential

Visual Indication: None

Sensor Type: Silicone Diaphragm

Operating Pressure Range: 0.15 to 5″ WC

Overpressure: (Burst) 13.8″WC (3.45kPa)

Max Operating Pressure: (Proof) 13.8″WC (3.45kPa)

Operating Temperature :-40° to 180℉(-40 to 82℃)

Operating Humidity: 10 to 90% Non-condensing

Wetted Parts: Silicone

Media Compatibility :Inert dry air

Process Connection: Tri-Barb (1/8",1/4″. 5/16″) tubing or 1/4″ comp.

Wiring Terminations :3 Terminals (SPDT)

Mounting :Vertical bracket, 4 slots 0.2″x 0.3.9″ (0.5 x 1cm)

Enclosure Rating :Zink-plated steel, NEMA 1

Dimensions: 4.63″ w x 4.1″ h x 2.7″ d, (11.7 x 10.4 x 6.7 cm)

Weight: 0.9 lb (0.4 kg)

Approvals: UL File #MH6213, CSA

Warranty: 2 year


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