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 down 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 give 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. This gel is not classified as dangerous.
|Maximum recommended operating pressure||60 p.s.i.g.|
|Size:||475 x 250 x 128mm.|
|Weight:||8kg per unit.|
|The unit is self-contained in a rugged steel case with plated fasteners and a carrying handle to ease transportation.|
|7 metre long flexible hose provided with fittings to suit 1/8" BSP ballvalves.|
|Hose can be transported in case.|
Damaged units should be returned to works for repair/quotation. Spare parts are available ex works.
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