Siemens QPL25.150 Gas Pressure Switch

Pressure switches are used to monitor gas or air pressure. When the pressure drops below or exceeds the switch setting, the circuit will open or switch. Set the required switch points, remove the pressure switch cover and rotate it clockwise to increase the set value, or counterclockwise to decrease the QPL/QPH for regulating the use of gas valve groups and gas equipment (gas burners) under air and gas. It is used as a small or pressure switch for pressures below 500 mbar. Suitable for Class 1, 2, 3 gases and other non corrosive gases