Kromschroder Gas pressure switch DG 10UG-9K2 84447012

The Kromschroder DG 10UG-9K2 (SKU 84447012) is a gas pressure switch with an adjustable switching range of 1-10 mbar. It features gold-plated contacts and an IP65 protection class. This device is used to monitor gas or air pressure in burner and boiler systems, ensuring safe operation by signaling when pressure deviates from set limits.

When selecting a replacement pressure switch of this type, verify the adjustable switching range, connection size, and electrical ratings match the original. The switch must be compatible with the medium (gas or air) and the control circuit voltage. Installation involves connecting the impulse line to the pressure tap and adjusting the setpoint to the required pressure. Ensure the electrical connections are properly rated and the switch is mounted in the correct orientation.

Common failures of this type include a torn diaphragm, blocked impulse tube, or drifted setpoint. These can cause the burner to lock out, often mistaken for an ignition fault. Check the impulse tube for blockages, verify the setpoint is correct, and inspect the diaphragm for damage.