Kromschroder Gas pressure switch DG50UG-6Z 84447378

The Kromschroder DG50UG-6Z (SKU 84447378) is a diaphragm pressure switch designed for monitoring pressure changes in gas or air environments. It operates with an NBR diaphragm and features a lower housing made of AlSi 12, with a glass fibre reinforced PBT plastic upper housing that has low gas release. The switch is silicone-free, has a safety class of 1, and uses screw terminals for electrical connection. It has a connection thread of M16 x 1.5 and is suitable for media such as natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by vol. H2S), and air.

When selecting a replacement pressure switch of this type, ensure the connection thread (e.g., M16 x 1.5) matches the existing line entrance, and verify the electrical connection type (screw terminals) is compatible. The switch should be chosen based on the required pressure range and media compatibility, and the line diameter (0.5 to 1.8 mm) must fit the clamping range of the cable gland. Installation involves connecting the pressure line to the appropriate port and wiring the screw terminals according to the system's electrical specifications.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to detect pressure changes or to trigger false alarms. Symptoms may include the burner not starting, unexpected shutdowns, or erratic operation. Check the diaphragm for cracks or deformation, verify the electrical continuity of the switch contacts, and ensure the pressure sensing line is not blocked or leaking.