Kromschroder Air pressure switch DL5ET-1 84444920

The Kromschroder DL5ET-1 air pressure switch (SKU 84444920) is a diaphragm-type pressure switch designed for monitoring overpressure and dilution pressure differences in air or flue gas systems. It features a tempered LSR diaphragm system and a glass fibre reinforced PBT plastic housing with low gas release. The switch has a pressure range of 0.5–5 mbar and is equipped with a microswitch conforming to EN 61058-1. Electrical connection is via AMP plugs (UR recognized), and the device meets safety class II per VDE 0106-1. The designed lifetime is 10 years, and it weighs 134 g.

When selecting a replacement air pressure switch of this type, verify the pressure range, electrical connection type, and mounting configuration. Ensure the switch's setpoint range matches the system requirements, and check that the electrical ratings and connection method (e.g., AMP plugs) are compatible with the existing wiring. The switch should be installed in a location where it can sense the intended pressure difference, with proper orientation and secure mounting. Always confirm the medium compatibility (air or flue gas) and temperature limits before installation.

Common failure modes for air pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to actuate or to actuate at incorrect pressures. This may result in burner lockouts, erratic operation, or failure to detect pressure drops. Check for visible damage to the diaphragm or housing, and verify the switch's operation by applying known pressures and measuring continuity. Also inspect the electrical connections for corrosion or loose terminals, which can cause intermittent signals.