Model AFS-222 Air Pressure Sensing Switch is a general-purpose proving switch designed for HVAC and Energy Management applications. It may be used to sense positive, negative, or differential air pressure. The plated housing contains a diaphragm, a calibration spring, and a snap-acting SPDT switch.
The sample connections located on each side of the diaphragm accept 6mm OD copper tubing via the integral compression ferrule and nut.
Mounting Position: Mount with the diaphragm in any vertical plane.
Set Point Range: 0.05 ± 0.02″ w.c. to 12.0″ w.c.
Field Adjustable “Operate Range”: 0.07″ w.c. to 12.0″ w.c.
Field Adjustable “Release Range”: 0.04″ w.c. to 11.2″ w.c.
Approximate Switching Differential: Progressive, increasing from 0.02 ± – 0.01″ w.c. at minimum set point to approximately 0.8″ w.c. at maximum set point.
Measured Media: Air, or combustion by-products that will not degrade silicone.
Maximum Pressure: ½ psi (0.03 bar).
Operating Temperature Range: -40˚F to 180˚F (-40 to 82˚C).