Kromschroder Air pressure switch DL5A-32 84444475

The Kromschroder DL5A-32 is a mechanical diaphragm pressure switch designed to regulate positive, negative, or differential air and flue gas pressures. It has an adjusting range of 0.4–5 mbar and features a tempered LSR diaphragm system. The housing is made of glass fibre reinforced PBT plastic with low gas release, and the electrical connection is via screw terminals. The switch operates with a microswitch to EN 61058-1, is safety class II, and has a designed lifetime of 10 years. It complies with EN 13611:2015+AC:2016 and EN 1854:2010, and carries CE-0085AP0466 approval.

When selecting a replacement pressure switch of this type, verify the pressure range, connection thread (e.g., Rp 1/4), and electrical ratings match the original. Ensure the switch is suitable for the medium (air or flue gas) and pressure type (positive, negative, or differential). Mounting forms may vary, so check the housing style and terminal layout for compatibility. Always confirm the switch's safety approvals and standards meet local requirements.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing. This may cause the burner to fail to start, shut down unexpectedly, or operate at incorrect pressures. Check for visible damage, test the switch with a manometer, and verify electrical continuity across the microswitch.