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Custom-built horizontal humidity cabinet

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THE Defence, Science & Technology Organisation (DSTO) recently contacted IDM Instruments regarding a common problem of not being able to purchase a humidity cabinet, off the shelf, which could be positioned within its existing flue extractor cabinet.

After consultations with DSTO regarding size limitations, draining, filling and temperature/humidity combinations, IDM designed a horizontal humidity cabinet to be placed into the existing extractor cabinet and hold additional sample testing holders (speeding up testing turn around).

These unique sample holders require a constant vacuum flow of air to satisfy test conditions.

Controlling the vacuum flow are twelve adjustable flow meters, which are mounted onto one end of the cabinet to enable easy operator setting and adjustment.

With the large amount of air being sucked through the vacuum pump a decision was made to use a carbon vane type pump. These pumps operate with no oil and do not suffer from oil aeration therefore will suck away happily all day.

The horizontal humidity cabinet provides a controlled operating temperature of up to 40°C with an adjustable RH % within the chamber via digital touch controllers.

To enable an accurate control of the humidity cabinet a remote chiller unit is connected behind the humidity cabinet and supplies chilled water through the humidity trough.

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