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Differential Pressure Switches
NSA-DIFFER

Part Numbers

NSA-AFS-222
NSA-AFS-262
NSA-AFS-460

The NSA-AFS Series Differential Pressure Switches are general purpose proving switches designed for both HVAC and Energy Management applications. These pressure switches can be used to sense positive, negative, or differential air pressures when used in conjunction with an A/SPT or A/VPT Series sampling tube. The plated housing contains a diaphragm, calibration spring and single snap-acting contact closure with either a manual or automatic reset switch depending on the model. The enclosure cover contains a ½” conduit knockout and guards against accidental contact with the live switch terminal screws as well as the set point adjusting screw.

Applications

Monitoring Filter Blockage, Proof of Flow, Prove Excessive or Insufficient Flow, Alarms and Control

Input Pressure Range: NSA-AFS-222: 0.05 +/- 0.02" to 12" wc
NSA-AFS-262: 0.05 +/- 0.02" to 2.0" wc
NSA-AFS-460: 0.40 +/- 0.06" to 12.0" wc
Set Point Range: NSA-AFS-222: 0.05 +/- 0.02" to 12.0" wc
NSA-AFS-262: 0.07" to 2.0" wc
NSA-AFS-460: 0.40 +/- 0.06" to 12" wc
Field Adjustable "Operate" Range: NSA-AFS-222: 0.07 to 12.0" wc
NSA-AFS-262: 0.07" to 2" w
NSA-AFS-460: 0.46" to 12" wc
Field Adjustable "Release" Range: NSA-AFS-222: 0.04 to 11.2" wc | NSA-AFS-262: 0.04" to 1.9" wc
Approximate Switching Differential: Progressive, increasing from 0.02 +/- 0.01" wc @ min set point to 0.8" wc @ max set point
Contact (Load) Rating: NSA-AFS-222/NSA-AFS-262: 300 VA pilot duty @ 115 to 277 VAC, 60 Hz; 15A non-inductive to 277 VAC, 60 Hz
NSA-AFS-460: 15A @ 125, 250, or 277 VAC / 1/2A @ 125 VDC, 1/4A @ 250 VDC / ¼ hp @ 125 VAC, ½ hp @ 250 VDC
Contact Arrangement: NSA-AFS-222/NSA-AFS-262: SPDT w/ Automatic Reset
NSA-AFS-460: SPST-NC w/ Manual Reset
Measured Media: NSA-AFS-222/NSA-AFS-262: Air or combustion by-products that will not degrade silicone | NSA-AFS-460: Air
Maximum Pressure: 0.5 PSI (0.03 Bar)
Life Expectancy: NSA-AFS-222/NSA-AFS-262: 100,000 cycles min @ 1/2 psi (0.03 Bar) max pressure / cycle and max load
NSA-AFS-460: 6,000 cycles min @ 1/2 psi (0.03 Bar) max pressure / cycle & max load
Operating Temperature Range: -40 to 180ºF (-40 to 82ºC)
Operating Humidity Range: 10 to 95% RH, non-condensing
Mounting Direction: Any vertical plane
Enclosure Material: Galvanized Steel
Sample Line Connections: Accepts ¼" OD rigid or semi-rigid metallic tubing using integral compression fitting, ferrule and nut / "-112 Option": Includes two barbed fittings that accept ¼" flexible plastic tubing
Electrical Connections: Screw type terminal with cup washers
Conduit Opening: Accepts ½" Conduit (7/8" (22.3 mm) opening)
Agency Approvals: UL, CUL, FM, CSA, CE, ISO 9001: 2008
Dimensions (H x W x D): 6.25" x 4.46" x 3.18" (158.8 mm x 113.3 mm x 80.8 mm)
Weight: 1.2 lbs (0.544 kg)
Input Pressure Range: NSA-AFS-222: 0.05 +/- 0.02" to 12" wc
NSA-AFS-262: 0.05 +/- 0.02" to 2.0" wc
NSA-AFS-460: 0.40 +/- 0.06" to 12.0" wc
Set Point Range: NSA-AFS-222: 0.05 +/- 0.02" to 12.0" wc
NSA-AFS-262: 0.07" to 2.0" wc
NSA-AFS-460: 0.40 +/- 0.06" to 12" wc
Field Adjustable "Operate" Range: NSA-AFS-222: 0.07 to 12.0" wc
NSA-AFS-262: 0.07" to 2" w
NSA-AFS-460: 0.46" to 12" wc
Field Adjustable "Release" Range: NSA-AFS-222: 0.04 to 11.2" wc | NSA-AFS-262: 0.04" to 1.9" wc
Approximate Switching Differential: Progressive, increasing from 0.02 +/- 0.01" wc @ min set point to 0.8" wc @ max set point
Contact (Load) Rating: NSA-AFS-222/NSA-AFS-262: 300 VA pilot duty @ 115 to 277 VAC, 60 Hz; 15A non-inductive to 277 VAC, 60 Hz
NSA-AFS-460: 15A @ 125, 250, or 277 VAC / 1/2A @ 125 VDC, 1/4A @ 250 VDC / ¼ hp @ 125 VAC, ½ hp @ 250 VDC
Contact Arrangement: NSA-AFS-222/NSA-AFS-262: SPDT w/ Automatic Reset
NSA-AFS-460: SPST-NC w/ Manual Reset
Measured Media: NSA-AFS-222/NSA-AFS-262: Air or combustion by-products that will not degrade silicone | NSA-AFS-460: Air
Maximum Pressure: 0.5 PSI (0.03 Bar)
Life Expectancy: NSA-AFS-222/NSA-AFS-262: 100,000 cycles min @ 1/2 psi (0.03 Bar) max pressure / cycle and max load
NSA-AFS-460: 6,000 cycles min @ 1/2 psi (0.03 Bar) max pressure / cycle & max load
Operating Temperature Range: -40 to 180ºF (-40 to 82ºC)
Operating Humidity Range: 10 to 95% RH, non-condensing
Mounting Direction: Any vertical plane
Enclosure Material: Galvanized Steel
Sample Line Connections: Accepts ¼" OD rigid or semi-rigid metallic tubing using integral compression fitting, ferrule and nut / "-112 Option": Includes two barbed fittings that accept ¼" flexible plastic tubing
Electrical Connections: Screw type terminal with cup washers
Conduit Opening: Accepts ½" Conduit (7/8" (22.3 mm) opening)
Agency Approvals: UL, CUL, FM, CSA, CE, ISO 9001: 2008
Dimensions (H x W x D): 6.25" x 4.46" x 3.18" (158.8 mm x 113.3 mm x 80.8 mm)
Weight: 1.2 lbs (0.544 kg)

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