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The differential pressure switch LG50A4 is an adjustable differential pressure switch as per EN 1854 for automatic burner controls
For this purpose
The LME71 is used for the startup and supervision of multistage or modulating forced draft burners and atmospheric gas burners in intermittent operation
specifically designed to switch a large amount of electrical power through its contacts
Siemens QPD15.003 Differential Pressure Switch 1% increase applied The differential pressure switch LG50A4The QPD differential pressure switches are used for monitoring air pressures and air flows. When the pressure falls below or exceeds the adjusted switching point, the respective electrical circuit will be opened or changes over. Specifiactions: For the supervision of air pressures or air flows of oil or gas fired equipment (burners, boilers, furnaces) QPD15 are suitable as absolute or differential pressure Adjustable working pressure ranges up to 5
