Kromschroder Air pressure switch DL50A-31 84444490

The Kromschroder DL50A-31 air pressure switch (SKU 84444490) is a diaphragm pressure switch designed for air or flue gas applications. It has an adjustable pressure 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 has safety class II to VDE 0106-1. It weighs 300 g and has a connection thread of Rp 1/4.

When selecting a replacement pressure switch of this type, verify the pressure range, connection thread size, and electrical ratings match the original. Ensure the medium (air or flue gas) is compatible with the switch materials. Check the mounting orientation and available space for the housing and tube connection. Compare the switch's setpoint adjustment range with the system requirements before installation.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to actuate or to actuate at incorrect pressures. Microswitch contacts may wear or stick, leading to intermittent or no switching. Symptoms on equipment include burner lockouts, erratic pressure readings, or failure to start. Check for physical damage, contamination, or corrosion on the sensing element and verify the switch operation with a manometer.