The Model AFS-460-DSS is a general purpose airflow proving switch designed for 120 VAC HVAC and Energy Management applications where dual manual reset switches with SPST contacts are needed. It may be used to sense positive, negative, or differential air pressure. The plated housing contains a diaphragm, a calibration spring and two snap-acting SPST switches with a single manual reset button. The AFS-460-DSS has a field adjustable set point range of 1.25″ wc to 12.0″ wc. The screw terminals are protected by an enclosure that accepts two 1/2″ conduit connections. This switch has a dual SPST-NC manual reset contact arrangement. It is equipped with two compression ferrule and nut sample line connectors that accept ¼” OD rigid tubing.