Kromschroder Gas pressure switch DG150U-5 84447506

The Kromschroder DG150U-5 gas pressure switch monitors gas or air pressure changes, both increasing and decreasing. It has an adjustable pressure range of 30–150 mbar and is suitable for natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by vol. H2S), and air. The switch features a glass fibre reinforced PBT plastic housing with a lower housing section of AlSi 12, and a silicone-free NBR diaphragm. It operates with a 4-pin plug (without socket) and screw terminals, with an M16 x 1.5 line entrance. The device meets EN 13611:2015+AC:2016 and EN 1854:2010 standards, holds CE-0085AP0467 certification, and is safety class 1.

When selecting a replacement pressure switch of this type, verify the pressure range, electrical connection (e.g., plug type and terminal configuration), and process connection thread size. Ensure the switch is suitable for the gas or air type and that the ambient and medium temperatures are within the specified limits. Check the enclosure rating and safety class to match the application requirements. Mounting must align with the original orientation and line entrance position.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Electrical contact issues may cause intermittent or no signal. Symptoms on equipment include burner lockout, failure to start, or erratic pressure control. Regular functional checks, especially for decreasing pressure, are recommended to detect faults early.