Kromschroder Air pressure switch DL50K-3W 84444810

The Kromschroder DL50K-3W is a diaphragm pressure switch designed for air or flue gas, capable of measuring positive, negative, or differential pressure. It has an adjusting range of 2.5–50 mbar and operates within a maximum medium and ambient temperature range of -20 to 80 °C. The switch features a glass fibre reinforced PBT plastic housing with a hand wheel for adjustment, and electrical connection is via screw terminals. It weighs 400 g and is certified to CE-0085AP0466, complying with EN 13611:2015+AC:2016 and EN 1854:2010. The diaphragm system is made of tempered LSR, and the device has a designed lifetime of 10 years.

When selecting a pressure switch of this type, ensure the pressure range, medium compatibility (air or flue gas), and electrical connection method match the application. The switch can be mounted with a Z-angle bracket, and the cover screw and strain relief facility require a torque of 65 Ncm. Verify the pressure type (positive, negative, or differential) and the ambient temperature limits before installation.

Common failures include diaphragm rupture or leakage, leading to inaccurate pressure readings or failure to switch. Electrical contact issues may cause intermittent operation or no switching. Check for physical damage to the housing or diaphragm, and verify the micro switch functionality according to EN 61058-1.