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The Model AFS-305 is a general purpose proving switch designed to require manual reset following actuation. It can be used to sense positive, negative, or dif­ferential air pressure in HVAC and Energy Management applications that require operator interface. The plated housing contains a diaphragm, a calibration spring and a snap-acting SPDT switch. The AFS-305 has a field adjustable set point range of 0.25″ wc to 12.0″ wc. The screw terminals are protected by an enclosure that accepts two 1/2″ conduit connections. This switch has an SPDT manual reset contact arrangement. It is equipped with two compression ferrule and nut sample line connectors that accept ¼” OD rigid tubing.