Kromschroder Gas pressure switch DG50UG-9K2 84447022

The Kromschroder DG50UG-9K2 (SKU 84447022) is a diaphragm pressure switch designed to monitor pressure fluctuations in gas or air environments. It has an adjustable pressure range of 2.5 to 50 mbar and operates with a supply voltage of 24 V AC/DC. The switch features a glass fibre reinforced PBT plastic housing with a lower housing section made of AlSi 12, and a diaphragm made of NBR. It is silicone-free, has low gas release, and is rated IP65 for ingress protection. The electrical connection is via a 4-pin plug with socket and screw terminals, and it includes a pilot lamp for 24 V AC/DC. This model complies with EN 1854:2010 and safety class 1.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread (M16 x 1.5), and electrical connection (voltage and plug type) match the original. The switch is designed for rising pressure and can be used for gas or air applications. Verify the medium compatibility and temperature range, and check the ingress protection rating required for the installation environment. Mounting should follow the manufacturer's guidelines, ensuring proper sealing and electrical connections.

Common failures of diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing or false triggering. Electrical contact issues may cause intermittent operation or failure to switch. Symptoms on equipment include burner lockouts, erratic pressure readings, or failure to start. Check for physical damage, contamination, and verify the switch operation with a manometer and multimeter.