Kromschroder Gas pressure switch DG50UG-4K2 84447021

The Kromschroder DG50UG-4K2 is a diaphragm pressure switch with a pressure range of 2.5–50 mbar. It features a glass fibre reinforced PBT plastic housing with a lower housing section made of AlSi12, and an NBR diaphragm. The switch is silicone-free, has gold-plated contacts, and includes a green/red pilot lamp for 24 V AC/DC. It is rated IP65 and has a safety class of 1, with a connection thread of M16 x 1.5. This device is designed for monitoring pressure in gas or air environments, suitable for media such as natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1 %-by-vol. H2S), and air.

When selecting a pressure switch of this type, ensure the pressure range, connection thread, and electrical specifications match the system requirements. The switch must be compatible with the medium and ambient temperature range. Installation involves connecting the pressure line to the appropriate port and wiring the electrical connections via screw terminals. Verify the switching function with rising pressure and perform a leak check after maintenance.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and incorrect switching. Electrical contact issues may cause intermittent operation or failure to signal. Check for physical damage, contamination, or corrosion on contacts. Verify the switch responds correctly to pressure changes and that the pilot lamp indicates status properly.