Kromschroder Gas pressure switch DG110C8D-5W 84448550

The Kromschroder DG110C8D-5W is a diaphragm pressure switch with an adjusting range of 30–110 mbar. It is designed for use with natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1 %-by-vol. H2S), and air. The switch features a change-over contact and is silicone-free, with a diaphragm made of NBR. It has a glass fibre reinforced PBT plastic housing with a lower housing section of AlSi 12, and is IP54 rated with a standard socket. The device is RoHS compliant and has a weight of 102 g.

When selecting a pressure switch of this type, ensure the adjusting range and connection thread (R 1/4 external) match the system requirements. The electrical connection is via a 4-pin plug without socket, so verify the plug type and wiring configuration. The switch is designed for falling pressure and must be installed with the correct orientation and torque settings (cover screw and socket at 45 Ncm).

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing and improper burner operation. Symptoms may include the burner failing to start or shutting down unexpectedly, or the switch not responding to pressure changes. Check for visible damage to the diaphragm, verify the switch operation with a manometer, and ensure the electrical contacts are clean and functioning.