Kromschroder Gas pressure switch DG6U-6 84447251

The Kromschroder DG6U-6 gas pressure switch (SKU 84447251) is a diaphragm-type pressure switch designed to monitor pressure changes in gas or air systems. It has an adjusting range of 0.4 to 6 mbar and operates with rising positive pressure (gas/air), negative pressure (air), or differential pressure (air-air). The switch features a silicone-free NBR diaphragm, a glass fibre reinforced PBT plastic housing with low gas release, and a lower housing section made of AlSi 12. It is safety class 1, has a line entrance thread of M16 x 1.5, and connects via a 4-pin plug with socket and screw terminals. The switch is suitable for media such as natural gas, town gas, LPG (gaseous), flue gas, biogas (max. 0.1% by volume H2S), and air.

When selecting a replacement pressure switch of this type, ensure the adjusting range, electrical connection (e.g., plug type and terminal configuration), and line entrance thread match the existing installation. The switch must be compatible with the medium and pressure direction (positive, negative, or differential). Mounting involves connecting the pressure lines to the appropriate ports and securing the electrical plug. Verify the enclosure rating and temperature limits for the application environment.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, which can cause the switch to fail to actuate or to actuate at incorrect pressures. Symptoms may include burner lockout, erratic pressure readings, or the system not responding to pressure changes. Check for visible damage to the diaphragm, leaks at connections, and verify the switch operation against a known pressure source.