Kromschroder Differential pressure switch DG150UG-3Z 84447527

The Kromschroder DG150UG-3Z is a diaphragm pressure switch designed to monitor pressure changes in gases or air, responding to deviations from a setpoint. It features a microswitch with a switching contact that activates when the set pressure is reached, and the trigger level is adjusted via a handwheel. The housing is made of glass fibre reinforced PBT plastic with low gas release, and the lower housing section is AlSi 12. It has a silicone-free NBR diaphragm, screw terminals for electrical connection, and a connection thread of M16 x 1.5. The switch is suitable for natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by vol. H2S), and air, with a safety class of 1.

When selecting a pressure switch of this type, ensure the connection thread and line entrance thread match the existing installation, typically M16 x 1.5. The electrical connection must be compatible with screw terminals, and the switch should be chosen based on the medium and pressure range to be monitored. Mounting forms may vary, so verify the physical dimensions and enclosure rating (e.g., IP54 or IP65) to suit the environment. Before ordering, compare the trigger level adjustment mechanism and ensure it can be set to the required setpoint.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to activate or deactivate at the set pressure. This may result in the burner or boiler not responding to pressure changes, leading to unsafe operation or shutdown. Check for signs of corrosion or damage to the housing and verify the electrical continuity of the microswitch. Also, inspect the diaphragm for wear or perforation, and ensure the adjustment handwheel is functioning correctly.