Kromschroder Gas pressure switch DG150UG-4 84447030

The Kromschroder DG150UG-4 is a diaphragm pressure switch with an adjusting range of 30–150 mbar, suitable for monitoring positive, negative, or differential pressure of gases and air. It features gold-plated contacts, a silicone-free NBR diaphragm, and a glass fibre reinforced PBT plastic housing with a lower housing section of AlSi 12. The switch is adjusted via a handwheel and connects electrically through screw terminals with an M16 x 1.5 line entrance. It weighs 321 g and is classified under safety class 1.

When selecting a replacement pressure switch of this type, verify the required pressure range, connection thread size, and electrical ratings. Ensure the switch is compatible with the medium (e.g., gas type) and ambient conditions. Mounting typically involves connecting the pressure line to the appropriate port and securing the electrical connections. Check the switching function and setpoint adjustment before installation.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing or incorrect switching. Contacts may become worn or corroded, causing intermittent or no switching. Symptoms on equipment include failure to start, unexpected shutdowns, or alarms related to pressure deviations. Regular inspection and functional testing are recommended to detect issues early.