Kromschroder Air pressure switch DL10A-31 84444480

The Kromschroder DL10A-31 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 sensing element is a tempered LSR diaphragm, and the switching element is a micro switch to EN 61058-1. Electrical connection is via screw terminals, and the switch has a weight of 250 g. It is safety class II to VDE 0106-1 and has a designed lifetime of 10 years.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread (e.g., Rp 1/4), and electrical connection method match the original. Verify the medium compatibility (air or flue gas, no flammable or aggressive gases) and the ambient temperature range. The switch may have different mounting forms, so check the housing and tube connection configuration. Always compare the setpoint range and any adjustable features with the equipment's 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 with incorrect pressure. Check for visible damage to the diaphragm, loose electrical connections, or contamination in the pressure lines. If the switch fails to actuate at the setpoint, test with a manometer and verify the micro switch operation.