Kromschroder Air pressure switch DL8K-3 30 84444748

The Kromschroder DL8K-3 30 air pressure switch (SKU 84444748) monitors pressure in air or flue gas systems, with an adjusting range of 0.5–8 mbar. It features a glass fibre reinforced PBT plastic housing, a tempered LSR diaphragm, and a micro switch compliant with EN 61058-1. Electrical connection is via screw terminals, and it includes a blue pilot lamp for 220/240 V AC. The switch weighs 250 g and has a designed lifetime of 10 years. Cover screw and strain relief torque are both 65 Ncm.

When selecting a pressure switch of this type, verify the adjusting range matches the system's required setpoint, and ensure the medium is compatible (air or flue gas, not flammable or aggressive). Check the electrical connection type (screw terminals) and voltage rating for the pilot lamp. Mounting typically involves a tube connection; ensure the housing orientation and pressure port alignment suit the installation. Compare the switch's safety class and standards compliance with the application's requirements.

Common failure modes include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Micro switch contacts may wear or stick, causing the burner to fail to start or shut down unexpectedly. Symptoms include erratic operation, failure to maintain pressure setpoint, or no response to pressure changes. Check for visible damage to the housing, diaphragm integrity, and continuity of the micro switch.