Kromschroder Gas pressure switch DG50H-3T 84447624

The Kromschroder DG50H-3T is a diaphragm pressure switch designed to monitor gas or air pressure in burner and boiler systems. It has an adjusting range of 2.5 to 50 mbar and is suitable for use with natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by vol. H2S), and air. The switch operates within a maximum medium and ambient temperature range of -15 to 60 °C and a storage temperature of -20 to 40 °C. It features a glass fibre reinforced PBT plastic housing with low gas release, an NBR diaphragm, and an AlSi 12 lower housing section. The device is silicone-free, has safety class 1, and is rated IP 54. It weighs 321 g and has a line diameter of 0.5 to 1.8 mm, with a connection thread of M16 x 1.5.

When selecting a pressure switch of this type, ensure the adjusting range, connection thread, and electrical ratings match the system requirements. The switch is typically installed via the M16 x 1.5 thread and connected using screw terminals. Verify the line diameter (0.5–1.8 mm) and cable gland clamping range (4–10 mm) to ensure proper sealing. The switch may be mounted in any orientation, but the diaphragm must be positioned correctly to sense pressure changes.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to actuate or to actuate at incorrect pressures. Symptoms on the equipment may include burner lockout, erratic operation, or failure to start. Check for gas leaks, inspect the diaphragm for damage, and verify the switch's setpoint against a manometer.