Kromschroder Gas pressure switch DG300VC9-6W /B 75456406

The Kromschroder DG300VC9-6W /B is a mechanical diaphragm pressure switch designed for monitoring gas and air pressure. It has an adjustable pressure range of 100–300 mbar and features a glass fibre reinforced PBT plastic housing with an NBR diaphragm. The switch is silicone-free and has low gas release, making it suitable for use with various gases including natural gas, town gas, LPG (gaseous), flue gas, biogas, and air. It connects via a 4-pin plug with socket and has a line entrance thread of M16 x 1.5. The switch weighs 100 g and is safety class 1, with a maximum test pressure that is temporarily maximum.

When selecting a pressure switch of this type, ensure the pressure range, electrical connection, and line entrance thread match the system requirements. The switch should be installed with the pressure tap on the side opposite to the plug and the valvario connection at the bottom. Verify the medium compatibility and temperature range before installation. The adjustment is made via a hand wheel, and the electrical connection is via a 4-pin plug with socket.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause loss of pressure monitoring and lead to unsafe burner operation. Symptoms may include the burner failing to start, erratic pressure readings, or the system not responding to pressure changes. Check the diaphragm for damage, ensure the pressure tap is not blocked, and verify the electrical continuity of the switch.