Kromschroder Air pressure switch DL5ET-1 84444921

The Kromschroder DL5ET-1 is a diaphragm pressure switch designed for air or flue gas applications, excluding flammable or aggressive gases. It features a glass fibre reinforced PBT plastic housing with low gas release and a tempered LSR diaphragm system. The switch operates with a microswitch to EN 61058-1 and has a weight of 150 g. It is approved under CE-0085AP0466 and complies with EN 13611:2015+AC:2016 and EN 1854:2010, with production surveillance in place.

When selecting a replacement pressure switch of this type, ensure the pressure range, switching differential, and electrical ratings match the original specifications. Verify the connection thread size and electrical connections (change-over contact) are compatible. The mounting position and orientation must allow proper diaphragm operation. Check the medium compatibility (air or flue gas) and temperature range to avoid damage.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Microswitch contacts may wear or stick, causing erratic operation or failure to switch. Symptoms on equipment include burner lockout, false alarms, or failure to detect pressure changes. Inspect for cracks in the housing, corrosion, or debris blocking the pressure ports.