Kromschroder Air pressure switch DL50A-32 84444495

The Kromschroder DL50A-32 is a mechanical pressure switch designed to regulate positive, negative, or differential air and flue gas pressures. It has an adjusting range of 2.5 to 50 mbar and features a tempered LSR diaphragm system. The housing is made of glass fibre reinforced PBT plastic and includes screw terminals for electrical connection. The switch operates with a microswitch conforming to EN 61058-1 and is safety class 2. It weighs 250 g and has a connection thread of Rp 1/4.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread, and electrical ratings match the original. The switch must be compatible with the medium (air or flue gas) and the ambient temperature range. Mounting orientation and electrical connection (screw terminals) should be verified. Compare the setpoint adjustment range and any switching differential with the application requirements.

Common failure modes include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Microswitch contacts may wear or stick, causing the burner to fail to start or shut down unexpectedly. Check for visible damage, test the switch with a manometer, and verify electrical continuity across the terminals.