Kromschroder Gas pressure switch DG30U-6 84447291

The Kromschroder DG30U-6 gas pressure switch (SKU 84447291) is a mechanical diaphragm pressure switch designed to monitor pressure in gas or air systems. It operates over an adjusting range of 2.5 to 30 mbar and switches with rising positive pressure. The switch is suitable for natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1 %-by-vol. H2S), and air. It features a glass fibre reinforced PBT plastic housing with a lower housing section of AlSi 12, an NBR diaphragm, and a 4-pin plug with socket for electrical connection. The device is certified to CE-0085AP0467 and complies with EN 13611:2015+AC:2016 and EN 1854:2010, with safety class 1 and silicone-free construction.

When selecting a replacement pressure switch of this type, verify the pressure range, connection thread (M16 x 1.5), and electrical connection (4-pin plug with socket) match the original. Ensure the switching function (rising positive pressure) and pressure type (positive, negative, or differential) are compatible with the application. Check the medium compatibility (gas or air) and temperature limits. The switch is mounted via the line entrance thread; confirm the clamping range for the cable diameter (4 to 10 mm) and that the enclosure rating meets the installation environment.

Common failures of 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 physical damage to the housing, corrosion, or contamination of the diaphragm. Verify the electrical connections are secure and that the switch operates at the set point by testing with a manometer.