Kromschroder Air pressure switch DL3K-3 84444608

The Kromschroder DL3K-3 air pressure switch (SKU 84444608) is a diaphragm pressure switch designed to control positive, negative, or differential air and flue gas pressures. It has an adjusting range of 0.2 to 3 mbar and features a tempered LSR diaphragm system. The housing is made of glass fibre reinforced PBT plastic, and the electrical connection is via screw terminals. The switch weighs 250 g, has a cover screw torque of 65 Ncm, and a designed lifetime of 10 years. It complies with EN 13611:2015+AC:2016 and EN 1854:2010, and carries CE-0085AP0466 certification.

When selecting a replacement pressure switch of this type, ensure the pressure range, electrical connection type, and mounting configuration match the original. Check the medium compatibility (air or flue gas) and the maximum temperature limits. The switch should be installed with proper strain relief and the cover screw tightened to the specified torque.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing. Symptoms may include burner lockout, erratic operation, or failure to detect pressure changes. Check for visible damage to the diaphragm, proper electrical continuity, and correct pressure setpoint adjustment.