Kromschroder Gas pressure switch DG40VC1-5W /B 74214175

The Kromschroder DG40VC1-5W /B (SKU 74214175) is a diaphragm pressure switch designed to monitor pressure in gas, air, and biomethane systems. It has an adjusting range of 5–40 mbar, set via a hand wheel. The switch is certified to FM and UL standards and is silicone-free with low gas release. Its housing is made of glass fibre reinforced PBT plastic, with a lower housing of AlSi 12, and the diaphragm is NBR. It operates within medium and ambient temperatures of -20 to 80 °C and stores at -20 to 40 °C, with a weight of 90 g.

When selecting a pressure switch of this type, verify the required pressure range, connection thread (e.g., M16 x 1.5), and electrical connection (e.g., 4-pin plug). Ensure the medium and ambient temperature limits match your application. Mounting may involve bottom valvario connection and side pressure tap; check the line diameter compatibility (0.5–1.8 mm) and clamping range. Always compare the switch's safety class and certifications with system requirements.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing or false switching. Electrical contact issues may cause intermittent operation or failure to actuate. Check for physical damage, contamination, or corrosion on the diaphragm and housing. Verify the set point by applying pressure and observing the switch action.