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) |
