Kromschroder Air pressure switch DL10K-3 84444807

The Kromschroder DL10K-3 is a diaphragm pressure switch designed to regulate positive, negative, or differential air and flue gas pressures. It has an adjusting range of 1–10 mbar and features a glass fibre reinforced PBT plastic housing with low gas release. The switch operates with a tempered LSR diaphragm system and includes a tube connection, hand wheel, and adjustment handwheel. Electrical connection is via screw terminals, and the micro switch complies with EN 61058-1. The product is certified to EN 13611:2015+AC:2016 and EN 1854:2010, with CE product ID CE-0085AP0466, and weighs 400 g.

When selecting a replacement pressure switch of this type, ensure the pressure range, electrical connection, and mounting configuration match the original. Verify the medium compatibility (air or flue gas) and the pressure type (positive, negative, or differential). Check the housing dimensions and tube connection size to fit the existing piping. The switch must be installed with the correct torque for the cover screw and strain relief, typically 65 Ncm, to maintain proper sealing and electrical safety.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect burner operation. Symptoms may include burner lockout, failure to start, or unstable flame. Check for physical damage, contamination, or corrosion on the diaphragm and housing. Verify the switch actuation by measuring continuity across the terminals while applying pressure within the specified range.