Kromschroder Air pressure switch DL8K-3 84444740

The Kromschroder DL8K-3 is a mechanical diaphragm pressure switch designed for monitoring overpressure, vacuum, and pressure drop in air or flue gas systems. It has an adjusting range of 0.5–8 mbar and features a tempered LSR diaphragm system within a glass fibre reinforced PBT plastic housing. The switch uses a micro switch compliant with EN 61058-1 and connects via screw terminals. It operates within a safety class II rating and weighs 200 g. The cover screw and strain relief facility require a torque of 65 Ncm.

When selecting a pressure switch of this type, ensure the pressure range and medium compatibility match your system. Verify the electrical connection type (e.g., screw terminals) and the mounting orientation. Check the switch's safety class and any required standards. For installation, torque the cover screw and strain relief to the specified value, typically 65 Ncm.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing. This may cause the burner or boiler to shut down or fail to start. Micro switch contacts can wear or stick, resulting in erratic operation or no switching. Check for physical damage, contamination, or incorrect adjustment. Verify the switch operation by applying pressure and measuring continuity.