Kromschroder Pressure switch for gas DG150N-3 84447740

The Kromschroder DG150N-3 pressure switch (SKU 84447740) monitors pressure changes in gas or air systems. It has an adjusting range of 30–150 mbar and operates within medium and ambient temperatures of -15 to 60 °C. The switch features a glass fibre reinforced PBT plastic housing with an NBR diaphragm, and is silicone-free with low gas release. It is rated IP54, safety class 1, and weighs 321 g. Connection is via screw terminals with an M16 x 1.5 line entrance.

Pressure switches of this type are selected by matching the adjusting range to the system's operating pressure, ensuring the medium and ambient temperature limits are not exceeded, and verifying the electrical connection type (screw terminals) and line diameter (0.5–1.8 mm) are compatible. The line entrance thread (M16 x 1.5) must match the existing conduit or cable gland. Before ordering, confirm the protection class (IP54) suits the installation environment and that the switch is suitable for the specific gas type.

Common failure modes for such pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing. Symptoms may include the burner failing to start, unexpected shutdowns, or erratic operation due to false pressure readings. Check for visible damage to the diaphragm, verify the setpoint with a manometer, and inspect the electrical connections for corrosion or loose terminals.