Kromschroder Gas pressure switch DG30UG-3 84447292

The Kromschroder DG30UG-3 is a diaphragm pressure switch designed for monitoring pressure changes in gas or air environments. It operates on positive, negative, and differential pressure, with an adjusting range of 2.5 to 30 mbar. The switch features gold-plated contacts and screw terminals for electrical connection, and is housed in glass fibre reinforced PBT plastic with an NBR diaphragm. It is silicone-free and suitable for use with natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by vol. H2S), and air. The device has a safety class of 1 and a line entrance thread of M16 x 1.5.

When selecting a pressure switch of this type, ensure the pressure range, connection thread, and electrical ratings match the application. Verify the medium compatibility and temperature limits. Installation involves mounting the switch securely, connecting the pressure lines, and wiring the screw terminals according to the system's electrical diagram. Always check the switching function with rising pressure to confirm correct operation.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Contacts may become worn or corroded, causing intermittent or no electrical signal. If the equipment fails to respond to pressure changes, check the diaphragm for damage, verify the pressure lines are clear, and test the switch with a manometer to ensure it actuates at the set point.