Dungs Pressure switch GW150A5 225940

The Dungs GW150A5 pressure switch, SKU 225940, is a gas valve accessory designed to monitor gas pressure and switch a circuit on, off, or reset it when the pressure deviates from a preset reference value. It has an adjusting range of 10–150 mbar and a maximum operating pressure of 500 mbar. The switch operates within an ambient and medium temperature range of 15–70 °C, and can be stored at temperatures from -30 to 80 °C. It features an IP 54 ingress protection rating, with a housing made of aluminum die casting and a switch made of polyamide. The switching contact is made of fine silver (Ag), and the device is certified under CE-0085 AO 0012 and CE0036.

Pressure switches of this type are selected by matching the adjusting range to the system's operating pressure, ensuring the maximum operating pressure exceeds the system's maximum, and verifying that the electrical connection and ingress protection meet the application requirements. Installation involves connecting the pressure line to the appropriate port, typically via an O-ring flange connection, and adjusting the set point using the setting wheel. The ambient and medium temperature ranges must be compatible with the installation environment.

Common failure modes for such 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 the burner not starting, unexpected shutdowns, or the system not responding to pressure changes. Checking involves verifying the switch's operation against a known pressure source and inspecting for physical damage or contamination.