Kromschroder Gas pressure switch DG 1,5IG-3 84447091

The Kromschroder DG 1,5IG-3 gas pressure switch (SKU 84447091) monitors gas pressure in a range of 200–1500 mbar. It features a single-pole changeover (SPDT) contact and manual adjustment of the actuation point. The switch operates without external power, as it is a mechanical relay. It is compatible with natural gas, LPG, and town gas, and has an accuracy of ±5 % of set range. The body is made of stainless steel, with a G 1/4" IG connection thread and IP40 protection class. It is designed for ambient temperatures up to 60 °C and originates from Germany.

When selecting a replacement pressure switch of this type, verify the adjustable pressure range, connection thread size, and contact type match the burner control circuit. The switch must be compatible with the gas medium and meet the required protection class for the installation environment. Mount the switch with the diaphragm in the orientation recommended by the manufacturer, and ensure the impulse line is clean and free of debris before installation. After fitting, adjust the setpoint according to the burner manufacturer's specification and test the safety function by simulating pressure conditions.

Common failure modes include a torn diaphragm, blocked impulse tube, or setpoint drift due to vibration or dirt. These issues often cause burner lockouts that may be misdiagnosed as ignition problems. Check the impulse line for blockages or condensation, and verify the setpoint with a manometer. If the switch fails to actuate correctly, inspect the diaphragm for damage and replace the switch if necessary.