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Fixed Differential Pressure Switch DFS-221

Fixed Differential Pressure Switch


The Cleveland Controls Model DFS-221 Fixed Differential Pressure Switch is an airflow proving switch designed for duct heater, oven, and other HVAC and energy management applications. The unit senses positive, negative, or differential pressure with SPDT switch actuation on pressure rise at 0.05 WC, ±0.02 WC. The model DFS-221 is equipped with two barbed sample line connections for use with ID flexible tubing. Electrical connections are made via male quick connect terminals for easy installation.


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QtyModelDescriptionIn StockList PriceInternet Price
DFS-221-112 DIFF PRESS SW, FIXED, 0.05+/-0.02" WCIn Stock79.9144.75


No accessories found
  • Fixed set point at 0.05 W.C. (12.5 Pa)
  • Prove excessive or insufficient pressure
  • Quick connect terminals
  • 15A, SPDT switch

Relay Type: SPDT

Relay Rating: 15 A resistive, 277 VAC, 60 Hz

 : 300 VA pilot duty @ 115-277 VAC, 60 Hz

Setpoint: Fixed @0.05″ WC (12.5 Pa)

Differential: 0.02" WC

Reset Automatic: reset by differential

Sensor Type: Silicone Diaphragm

Operating Pressure Range :0.05 to 2″ WC

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

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

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: Barb for 1/4″ and 3/8″ tubing

Wiring Terminations: 3 Spade terminals, 1/4″ x 0.032

Mounting Vertical bracket,: 2 holes 0.187 (0.5cm)

Enclosure Rating :Zink-plated steel, NEMA 1

Dimensions: 4.38″w x 6.12″ h x 2.94 d, (11.1 x 15.6 x 7.4 cm)

Weight: 1.2 lb (0.5 Kg)

Approvals: CE, CSA, FM, UL File #MH6213

Warranty: 2 year


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