Kromschroder Gas pressure switch DG300VC1-6W /B 75455246

The Kromschroder DG300VC1-6W /B is a diaphragm pressure switch designed for monitoring gas and air pressure, including biomethane. It has an adjusting range of 100–300 mbar and features a glass fibre reinforced PBT plastic housing with a lower housing section made of AlSi 12. The diaphragm is made of NBR and is silicone-free, with low gas release. Electrical connection is via a 4-pin plug with socket, and the device has a safety class of 1. The connection thread is M16 x 1.5, and the weight is 100 g.

When selecting a replacement pressure switch of this type, ensure the adjusting range matches the system requirements. The connection thread (M16 x 1.5) and line diameter (0.5–1.8 mm) must be compatible with existing fittings. Check the electrical connection type (4-pin plug with socket) and the pressure tap side (on the plug side) to match the installation. The Valvario connection is at the bottom, so verify the mounting orientation.

Common failures include diaphragm rupture or leakage, leading to inaccurate pressure readings or failure to switch contacts. Symptoms may include the burner not starting, unexpected shutdowns, or failure to detect pressure drops. Check for gas leaks around the diaphragm and housing, and verify the switch operation by testing with a manometer.