Kromschroder Pressure switch DL8K-1 30Z 84444749

The Kromschroder DL8K-1 30Z pressure switch (SKU 84444749) is a diaphragm-type pressure switch designed for monitoring overpressure, dilution pressure, or pressure differences in systems using air or flue gas. It features a tempered LSR diaphragm and a microswitch with change-over contact, compliant with EN 61058-1. The housing is made of glass fibre reinforced PBT plastic with low gas release, and the unit weighs 300 g. The cover screw and strain relief facility require a torque of 65 Ncm. It is suitable for medium and ambient temperatures from -20 to +80°C and is safety class II per VDE 0106-1.

When selecting a pressure switch of this type, ensure the pressure range, switching differential, and electrical ratings match the application. The switch must be compatible with the medium (air or flue gas) and the temperature range. Mounting orientation and connection size should be verified against the existing installation. The electrical connection must be made with proper strain relief, and the cover screw should be tightened to the specified torque.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing or false switching. Microswitch contacts may wear or stick, causing intermittent or no switching. Symptoms on equipment include burner lockout, failure to start, or erratic operation. Check for leaks, verify switch operation with a manometer, and inspect the diaphragm and electrical contacts for damage.