Kromschroder Air pressure switch DL150A-31 84444880

The Kromschroder DL150A-31 air pressure switch (SKU 84444880) is a diaphragm pressure switch designed for precise pressure monitoring in air and flue gas systems. It has an adjusting range of 30–150 mbar and features a tempered LSR diaphragm system. The housing is made of glass fibre reinforced PBT plastic with low gas release, and it includes screw terminals for electrical connection. The switch operates with a micro switch conforming to EN 61058-1 and meets safety class II standards. It is suitable for industrial and commercial applications 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. The switch must be compatible with the medium (air or flue gas) and the system's safety requirements. Installation involves connecting the pressure line to the threaded or tube connection and wiring the screw terminals according to the manufacturer's instructions. The cover screw and strain relief should be tightened to the specified torque (e.g., 65 Ncm) to ensure proper sealing and cable retention.

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. This may result in the burner or boiler not starting, shutting down unexpectedly, or operating without proper pressure monitoring. Check for visible damage to the housing, loose connections, or signs of contamination. Verify the switch's operation by comparing its actuation point against a known pressure source, and replace the switch if it does not function within its specified range.