The presence of gas inside a liquid-filled transformer is always a sign of malfunction. Analysis of the gas provides a good indication of the type of fault. Accessing the Buchholz relay, which signals gas presence in the transformer, can be dangerous while the transformer is in operation.
Comem GSD gas sampling device allows the gas to be collected from a safe position. It is placed in a readily accessible location, typically on the side of the transformer, and provides valuable information for preventative maintenance..