Kromschroder Gas pressure switch DG50UG-3K2 84447372

The Kromschroder DG50UG-3K2 is a diaphragm pressure switch designed to monitor pressure changes in gases or air, responding to rising or falling pressure relative to a setpoint. It features an adjustable range of 2.5–50 mbar, set via a handwheel, and switches a microswitch with a switching contact when the trigger level is reached. The switch has gold-plated contacts, a green/red pilot lamp for 24 V AC/DC, and electrical connection via screw terminals with an M16 x 1.5 cable gland. Its housing is made of glass fibre reinforced PBT plastic with a lower housing of AlSi 12, and the diaphragm is NBR, silicone-free. The device is rated IP54, safety class 1, and is suitable for gases like natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% H2S), and air.

When selecting a replacement pressure switch of this type, ensure the pressure range, connection thread (M16 x 1.5), and electrical ratings match the original. Verify the switching function (e.g., rising pressure) and the medium compatibility (e.g., gas type, silicone-free requirement). Check the mounting orientation and available space, as diaphragm switches may have specific installation positions. Compare the electrical connection type (screw terminals) and cable gland size to the existing wiring.

Common failures include diaphragm rupture or leakage, leading to loss of pressure sensing and failure to switch. Contacts may become worn or corroded, causing intermittent or no switching. The pilot lamp may fail, indicating a loss of power or internal fault. Symptoms on equipment include burner lockouts, erratic operation, or failure to detect pressure changes, prompting checks of the switch's setpoint and continuity.