Kromschroder Gas pressure switch DG30U-3 84447290

The Kromschroder DG30U-3 is a mechanical diaphragm pressure switch designed to monitor pressure fluctuations in gas or air systems. It operates within an adjusting range of 2.5 to 30 mbar and can sense positive, negative, or differential pressure. The switch features a glass fibre reinforced PBT plastic housing with a lower section made of AlSi 12, and an NBR diaphragm. It has an IP54 protection class, a connection thread of M16 x 1.5, and electrical connection via screw terminals. This device is silicone-free and has low gas release, making it suitable for various gas types including natural gas, LPG, and biogas.

When selecting a pressure switch of this type, ensure the adjusting range covers the required set point and that the pressure type (positive, negative, or differential) matches the application. The connection thread (e.g., M16 x 1.5) must fit the system's port, and the electrical connection (screw terminals) should be compatible with the wiring. Consider the medium (gas or air) and environmental conditions, such as temperature and humidity, to choose the appropriate protection class and materials. Installation should follow the manufacturer's guidelines, ensuring proper sealing and electrical connections.

Common failures of 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 lockouts, erratic operation, or failure to detect pressure changes. Regular inspection for leaks and functional testing, especially in systems with biogas, can help identify issues early. If the switch does not respond correctly, check the diaphragm for damage and verify the pressure settings against a calibrated gauge.