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DFS-221

Fixed Differential Pressure Switch

The 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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Features
  • Fixed set point at 0.05 W.C. (12.5 Pa)
  • Prove excessive or insufficient pressure
  • Quick connect terminals
  • 15A, SPDT switch
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Specifications

Contact Rating:15A resistive to 277 VAC, 60 Hz

300 VA pilot duty @ 115-270 VAC:

Contact Type:SPDT

Setpoints: Fixed, 0.05" W.C. (12.5 Pa), ±0.02" W.C.

Differential: 0.02" W.C., ±0.01" W.C.

Overpressure:0.5 psi (3.5 kPa bar)

Measurement Range:Fixed at 0.05″ WC (12.5 Pa)

Life Expectancy:100,000 cycles minimum @ 0.5 psi maximum each cycle and maximum rated load

Operating Temperature:-40° to 180°F (-40° to 82°C)

Mounting: Diaphram in vertical plane

Process Connection:Barbed fittings for 1/4" ID flexible tubing

Wiring Terminations:Male quick connect terminals

Approvals: CE, CSA, FM, UL Recognized

Weight: 1.2 lbs (0.5 kg)

Warranty: 2 years

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