Kromschroder Gas pressure switch DG6U-3 84447250

The Kromschroder DG6U-3 is a diaphragm pressure switch designed to monitor pressure fluctuations in gas or air environments, switching with rising positive pressure. It has an adjustable pressure range of 0.4 to 6 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 is silicone-free with low gas release. It has a protection class of IP54, safety class 1, and electrical connection via screw terminals with an M16 x 1.5 line entrance. The device complies with EN 1854:2010 and is certified under the Gas Appliances Regulation (EU) 2016/426.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread (M16 x 1.5), and electrical connection (screw terminals) match the original. Verify the switching function (rising pressure) and the medium compatibility (gas or air). Check the protection class (IP54) and safety class (1) to meet the application requirements. The line entrance clamping range is 4 to 10 mm for cable diameters.

Common failure modes for diaphragm pressure switches 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. Check for visible damage to the housing, corrosion, or contamination of the diaphragm, and verify the switch operation by measuring continuity across terminals while applying pressure.