The SCH-PSB is an adjustable differential pressure switch for monitoring overpressure, vacuum, and differential pressure of air or other non-combustible, non-aggressive gases commonly found in HVAC applications. The switching pressure is adjustable without a pressure gauge via a scaled adjustment knob. The switching differential is easily adjusted with a screwdriver. Download a datasheet at http://koboldusa.com/sites/default/files/product_files/pressure-switch-HVAC-differential-low.pdf
Kobold Instruments Inc.