Kromschroder Air pressure switch DL5K-3 84444709

The Kromschroder DL5K-3 is a mechanical diaphragm pressure switch designed for monitoring overpressure, vacuum, and pressure drop in air or flue gas systems. It features a tempered LSR diaphragm and a microswitch compliant with EN 61058-1, housed in glass fibre reinforced PBT plastic. The switch has an adjusting range of 0.4–5 mbar, screw terminals for electrical connection, and a hand wheel for adjustment. It is certified to CE-0085AP0466 and conforms to EN 13611:2015+AC:2016 and EN 1854:2010, with a designed lifetime of 10 years. The device weighs 0.222 kg and is suitable for industrial and commercial applications.

When selecting a pressure switch of this type, verify the required pressure range, medium compatibility (air or flue gas), and electrical connection method. Ensure the switch's adjusting range covers the system's operating pressures and that the switching element meets the control circuit's electrical ratings. Mounting typically involves connecting the pressure port to the system via tubing and securing the housing; the hand wheel allows field adjustment. Confirm the protection class and environmental temperature limits match the installation site.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and failure to switch at the set point. This may cause the burner to shut down or fail to start, or the system to operate without proper pressure monitoring. Check for visible damage to the diaphragm, loose electrical connections, or incorrect adjustment. Verify the switch's response by applying known pressures and observing the microswitch operation.