Kromschroder Gas pressure switch DG15C8D-5W 84448150

The Kromschroder DG15C8D-5W gas pressure switch (SKU 84448150) is a diaphragm-type pressure switch with a pressure range of 3–15 mbar. It switches with falling pressure and features a change-over contact, but is supplied without a socket. The switch is designed for use with natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1 %-by-vol. H2S), and air. It has a glass fibre reinforced PBT plastic housing with low gas release, an NBR diaphragm, and a lower housing made of AlSi 12. The device is silicone-free, has protection class IP00, and weighs 50 g. It is certified to CE-0085AQ0753 and complies with EN 13611:2015+AC:2016 and EN 1854:2010.

When selecting a gas pressure switch of this type, verify the required pressure range, connection thread size, and electrical connection configuration. The switch must be compatible with the gas type and the system's pressure conditions. Installation involves connecting the external thread (R 1/4) to the gas line, ensuring proper sealing, and wiring the 4-pin plug to the control circuit. The cover screw and socket must be tightened to the specified torque (45 Ncm) to maintain integrity. Always confirm that the switch's switching function (e.g., falling pressure) matches the application's safety requirements.

Common failure modes for gas pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing and failure to switch at the set point. This may cause the burner to operate without proper gas pressure monitoring, potentially resulting in unsafe conditions or system shutdown. Electrical contact failure can cause intermittent or no switching, preventing the burner from starting or stopping correctly. Check for physical damage, contamination, or corrosion on the diaphragm and contacts, and verify the switch operation by testing with a manometer.