This mechanical differential pressure switch is a compact and reliable pressure controller designed specifically for monitoring and controlling low-pressure differential pressures of 20-200Pa. It is widely used in HVAC systems, ventilation ducts, fans, boilers, filters, and air handling units. Wide pressure range: The adjustable pressure difference range is 20-200Pa. Single pole double throw (SPDT) switch design, flexible wiring, supports normally open (NO) and normally closed (NC) circuits. High reliability: mechanical structure, stable switch performance, long service life, strong anti-interference ability. The body is compact and , making it easy to integrate into limited spaces of HVAC and industrial control systems. Including installation tools: Comes with installation accessories that can be quickly and safely installed according to system design, and operate stably in vertical or horizontal positions. The built-in adjustment knob or (depending on the model and batch) can accurately set the switching point within the range of 20-200Pa. Used for monitoring airflow and filter blockage in HVAC systems. Ventilation ducts are used to detect fan malfunctions or insufficient air pressure. Boiler and burner monitor combustion air pressure to safe operation., Weight: 0.05732018812 Pounds, Manufacturer: Teuypty