Kromschroder Gas pressure switch DG500BG-3 84447470

The Kromschroder DG500BG-3 gas pressure switch, SKU 84447470, is a diaphragm-type pressure switch designed for monitoring pressure changes in gas or air systems. It has an adjusting range of 100–500 mbar and switches with rising positive pressure. The switch features gold-plated contacts, screw terminals, and a glass fibre reinforced PBT plastic housing with a lower housing of AlSi 12. It is silicone-free, has low gas release, and is rated IP54 with safety class 1. The device operates within a medium and ambient temperature range of -20 to 80 °C and a storage temperature of -20 to 40 °C, with a weight of 0.321 kg.

When selecting a pressure switch of this type, ensure the adjusting range covers the required pressure setpoint and that the pressure type (positive, negative, or differential) matches the application. The electrical connection must be compatible with the system's voltage and current, and the line diameter (0.5–1.8 mm) must fit the terminals. The line entrance thread (M16 x 1.5) and cable gland clamping range (4–10 mm) must match the conduit used. Also verify the protection class (e.g., IP54) suits the installation environment.

Common failures in 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 pressure readings, or failure to detect pressure drops. Check for leaks around the diaphragm and housing, and verify the switch operation by applying pressure and observing the switching action. Regular maintenance, including leak checks and functional testing, is recommended.