Kromschroder Air pressure switch DL3E-1 84444210

The Kromschroder DL3E-1 air pressure switch (SKU 84444210) is a diaphragm pressure switch designed to regulate positive, negative, or differential air and flue gas pressures. It features a tempered LSR diaphragm system and a glass fibre reinforced PBT plastic housing. The switch operates within a pressure range of 0.3–3 mbar and includes a microswitch conforming to EN 61058-1. It is safety class II to VDE 0106-1 and has a designed lifetime of 10 years per EN 13611 and EN 1854. Electrical connection is via AMP plugs, and the weight is 0.3 kg.

When selecting a replacement pressure switch of this type, verify the pressure range, electrical connection type, and mounting configuration. Ensure the switch is suitable for the medium (air or flue gas) and that the electrical ratings match the control circuit. Check the physical dimensions and thread or tube connections to fit the existing installation.

Common failure modes include diaphragm rupture or leakage, leading to loss of pressure sensing and improper burner operation. Symptoms may include burner lockout, failure to start, or unstable flame. Check for visible damage, test the switch with a manometer, and verify electrical continuity.