Dry Air Pump
The Dry Air Pump provides a portable solution for on-site testing of Gas and Oil operated Buchholz relays.

A charge of air is created in the polycarbonate cylinder by means of a foot operated pump. The cylinder contains an indicating silica gel, which absorbs the moisture present in the air. The pressure of the air charge is monitored on the built-in pressure gauge. When a suitable pressure has been attained the air charge is then quickly passed to the Buchholz via a flexible tube, by opening the ballvalve fitted to the cylinder. To prevent backpressure forcing oil back the flexible pipe a non-return valve is incorporated in the unit.

The indicating silica gel is a crystalline material, which absorbs moisture readily. The properties of the crystals can easily be regenerated by heating/drying. The crystals are impregnated with iron compounds, which gives them an orange colour. Upon absorption of moisture these crystals change from their orange colour to a pale yellow and then become colourless. When the crystals change to pale yellow they should be regenerated.

Max. operating pressure 60 psig Self contained in a rugged steel case with carrying handle Supplied with 7m long hose and fittings Size; 475 x 250 x 128mm

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DIN Buchholz Leaflet (454kb)