Kromschroder Gas pressure switch DG150BG-3 84447420

The Kromschroder DG150BG-3 is a diaphragm pressure switch designed for monitoring gas or air pressure, switching with rising positive pressure. It has an adjusting range of 30–150 mbar and operates within a medium and ambient temperature range of -20 to 80 °C. The switch features gold-plated contacts, screw terminals, and a glass fibre reinforced PBT plastic housing with a lower housing of AlSi 12. It is silicone-free, has a low gas release, and is certified to EN 13611 and EN 1854 with CE product ID CE-0085AP0467. The device weighs 0.321 kg and has an IP 54 rating.

When selecting a pressure switch of this type, ensure the adjusting range and pressure type (rising positive pressure) match the application requirements. Check the electrical connection type (screw terminals) and line entrance thread (M16 x 1.5) for compatibility with existing wiring and conduit. Verify the medium and ambient temperature limits and the enclosure rating (IP 54) suit the installation environment. Confirm the switch is suitable for the gas or air pressure monitoring task and that the diaphragm material is compatible with the medium.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing and failure to switch at the set point. Symptoms may include the burner or boiler not starting, intermittent operation, or failure to shut down on pressure loss. Check for leaks around the diaphragm and housing, and verify the switch operation by testing with a manometer. Regular maintenance, including tightness and function checks, is recommended to ensure operation.