Kromschroder Pressure switch for gas DG50U-3A 84447359

The Kromschroder DG50U-3A pressure switch (SKU 84447359) is a diaphragm-type differential pressure switch designed to monitor pressure changes in gases or air. It switches with rising positive pressure and features a microswitch with a switching contact. The trigger level is adjustable externally via a handwheel, and the pressure range is 2.5–50 mbar. The housing is made of glass fibre reinforced PBT plastic with low gas release, and the diaphragm is NBR. It is silicone-free and has screw terminals for electrical connection, with a line entrance thread of M16 x 1.5.

When selecting a pressure switch of this type, ensure the pressure range, switching function (rising or falling), and electrical connection match the application. Check the line diameter (0.5–1.8 mm) and line entrance thread (M16 x 1.5) for compatibility with existing wiring and conduit. The switch may be used for positive, negative, or differential pressure monitoring, so verify the pressure type required. Installation involves connecting the pressure lines and wiring the screw terminals, then adjusting the setpoint with the handwheel.

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 may include burner lockouts, erratic operation, or failure to detect pressure changes. Check for physical damage to the housing, verify the diaphragm integrity, and test the switch operation against a known pressure source.