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*Model 643 Combination CGSB/VBW Water Vapour Diffusion Apparatus*
General Description
A Water Vapour Diffusion Apparatus (WVDA) is a system that is used to measure the rate at which water vapour diffuses through fabrics. The model 643 WVDA consists of a Water Vapour Diffusion (WVDC) Cell and a water and dry air supply system. The water supply system consists of a Cell Fill Reservoir and connecting valve, tubing and fittings. The air supply system consists of a flowmeter, two air drying columns, connecting tubing and fittings.
A power supply to run the cell heater, a multimeter to read the cell temperature sensors and a top-loading laboratory balance to measure the moisture loss from the cell are sold separately or supplied by the user.
*The Combination Cell*
The system uses a unique combination cell design. The cell sets up a moisture gradient across a test specimen by maintaining a moisture source on one side of it and a moisture sink on the other side. The source is water held behind a membrane and the sink is dry air behind another membrane. The cell may be used to do moisture diffusion tests to: The Canadian Government Standards Board standard: CAN/CGSB - 4.2 No. 49-99; and The Van Beest and Wittgen (VBW) method.		In the VBW mode, the water side is on the bottom.
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