Kromschroder Gas pressure switch DG150B-3 84447400

The Kromschroder DG150B-3 gas pressure switch, SKU 84447400, is a component designed to regulate positive, negative, or differential air and flue gas pressures. It has an adjusting range of 30–150 mbar and operates with rising positive pressure. The switch features screw terminal electrical connections and an M16 cable gland, with an IP54 protection class. It weighs 0.321 kg and has a designed lifetime of 10 years. The product complies with EN 13611:2015+AC:2016 and EN 1854:2010 standards and holds certification CE-0085AP0466.

When selecting a pressure switch of this type, ensure the adjusting range covers the required pressure setpoint and that the electrical connection (e.g., screw terminals) and cable gland size match the installation. Verify the protection class (e.g., IP54) suits the environment. The switch must be compatible with the gas type (air or flue gas) and the system's pressure type (positive, negative, or differential). Mounting orientation and process connections should be checked against the existing setup.

Common failure modes for such pressure switches include diaphragm rupture, contact welding, or drift in setpoint. Symptoms may include burner lockout, failure to start, or erratic operation. Check for leaks, verify the switch actuates at the correct pressure, and inspect contacts for damage or corrosion.