A differential pressure switch measures the pressure difference between two points and triggers an electrical contact when the set differential is reached. It contains two pressure ports connected to a sensing element, such as a diaphragm or bellows, that moves proportionally to the pressure difference. When this movement reaches the calibrated setpoint, it actuates a microswitch to open or close a circuit. This function is vital for filter monitoring, flow detection, and system protection in industrial and HVAC systems.
