Model AFS-298-112 is a general purpose proving switch designed for HVAC and Energy Management applications. It can 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 AFS-298-112 has a field adjustable set point range of 0.05″ wc to 12.0″ wc. It is equipped with three ¼”, 90º, quick-connect spade terminals. The two barbed sample line connectors accept flexible tubing.