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Proving air flow in a duct or across a filter, this differential pressure switch trips between 0.4 to 12.0 inWC and holds that setting with manual reset. The diaphragm actuates a snap-acting contact, giving a clean signal to a fan interlock, damper end switch or alarm circuit, and it consumes no air in the process. Setting the trip point needs no tool beyond the adjustment screw.
Proving air flow in a duct or across a filter, this differential pressure switch trips between 0.4 to 12.0 inWC and holds that setting with manual reset. The diaphragm actuates a snap-acting contact, giving a clean signal to a fan interlock, damper end switch or alarm circuit, and it consumes no air in the process. Setting the trip point needs no tool beyond the adjustment screw.
The 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 1/2" conduit knockout and guards against accidental contact with the live switch terminal screws as well as the set point adjusting screw.
Features
Applications
| Input Pressure Range | 0.40 ± 0.06" to 12.0" wc |
| Measured Media | Air |
| Pressure Range | 0.4 to 12.0 inWC |
| Approximate Switching Differential | Progressive, increasing from 0.02 ± 0.01" wc @ minimum set point to 0.8" wc @ maximum set point |
| Contact Arrangement | SPST normally closed with manual reset |
| Reset | Manual |
| Set Point Range | 0.40 ± 0.06" to 12" wc |
| Electrical Connections | Screw type terminal with cup washers |
| Sample Line Connections | "-112 Option": Includes two barbed fittings that accepts 1/4" flexible plastic tubing |
| Conduit Opening | Accepts 1/2" Conduit (7/8" (22.3 mm) opening) |
| Field Adjustable "Operate" Range | 0.46" to 12" wc |
| Field Adjustable "Release" Range | 0.46"w.c. to 11.2" w.c. |
| Maximum Pressure | 0.5 PSI (0.03 Bar) |
| Operating Humidity Range | 10 to 95% RH, non-condensing |
| Operating Temperature Range | -40 to 180°F (-40 to 82°C) |
| Enclosure Material | Galvanized Steel Accepts 1/4" OD rigid or semi-rigid metallic tubing using integral compression fitting, ferrule and nut | |
| Mounting Direction | Any vertical plane |
| Product Dimensions (L x W x H) | 4.35 x 6.20 x 3.60" (110.5 x 157.5 x 91.4 mm) |
| Product Weight | 1.12 lbs (507 g) |
| Agency Approvals | UL, CUL, FM, CSA, CE, ISO 9001: 2008 |
| Input Pressure Range | 0.40 ± 0.06" to 12.0" wc |
| Measured Media | Air |
| Pressure Range | 0.4 to 12.0 inWC |
| Approximate Switching Differential | Progressive, increasing from 0.02 ± 0.01" wc @ minimum set point to 0.8" wc @ maximum set point |
| Contact Arrangement | SPST normally closed with manual reset |
| Reset | Manual |
| Set Point Range | 0.40 ± 0.06" to 12" wc |
| Electrical Connections | Screw type terminal with cup washers |
| Sample Line Connections | "-112 Option": Includes two barbed fittings that accepts 1/4" flexible plastic tubing |
| Conduit Opening | Accepts 1/2" Conduit (7/8" (22.3 mm) opening) |
| Field Adjustable "Operate" Range | 0.46" to 12" wc |
| Field Adjustable "Release" Range | 0.46"w.c. to 11.2" w.c. |
| Maximum Pressure | 0.5 PSI (0.03 Bar) |
| Operating Humidity Range | 10 to 95% RH, non-condensing |
| Operating Temperature Range | -40 to 180°F (-40 to 82°C) |
| Enclosure Material | Galvanized Steel Accepts 1/4" OD rigid or semi-rigid metallic tubing using integral compression fitting, ferrule and nut | |
| Mounting Direction | Any vertical plane |
| Product Dimensions (L x W x H) | 4.35 x 6.20 x 3.60" (110.5 x 157.5 x 91.4 mm) |
| Product Weight | 1.12 lbs (507 g) |
| Agency Approvals | UL, CUL, FM, CSA, CE, ISO 9001: 2008 |
