Kromschroder Gas pressure switch DG50U-3 84447350

The Kromschroder DG50U-3 gas pressure switch monitors pressure changes in gas or air systems, switching with rising pressure. It has an adjustable range of 2.5 to 50 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, an NBR diaphragm, and is silicone-free with low gas release. It is rated IP54, safety class 1, and has an M16 x 1.5 line entrance.

When selecting a gas pressure switch of this type, ensure the pressure range, switching function (rising or falling), and electrical connection match the application. Verify the process medium compatibility and temperature limits. The switch is typically installed via the M16 x 1.5 line entrance with a cable gland, and the diaphragm must be suitable for the gas or air being monitored. Check the enclosure rating and safety class requirements before mounting.

Common failure modes include diaphragm rupture or leakage, leading to loss of pressure sensing or false switching. Symptoms may include burner lockout, erratic operation, or failure to detect pressure changes. Inspect the diaphragm for cracks or deformation, and verify the switch operation by applying controlled pressure changes.