Humidity

The humidity test is performed for the purpose of evaluating, in an accelerated manner, the resistance of component parts and materials to the deteriorative effects of the high-humidity and heat conditions typical of tropical environments. Degradation can result directly or indirectly from absorption of moisture vapor by vulnerable insulating materials and from surface wetting of metals and insulation. They can produce many types of deterioration including corrosion of metals and changes in electrical properties.

Cycling differs from the steady-state humidity by employing temperature cycling, which provides alternate periods of condensation and drying essential to the development of the corrosion process. Increased effectiveness is also obtained by use of a higher temperature which intensifies the effects of humidity. The test may include a low-temperature subcycle since stresses caused by freezing moisture tend to widen cracks and fissures.
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Thermotron Model SM-32C A mechanically and CO²refrigerated, electrically heated, steam humidity controlled chamber. Chamber size: 38 inches wide x 38 inches deep x 38 inches high. Thermotron 2800 programmer/controller: for control of temperature and relative humidity. A Honeywell Truline microprocessor based thermal printing, circular chart recorder.
	Thermotron Model SE-600L A mechanically and CO²refrigerated, electrically heated, steam humidity controlled chamber. Chamber size: 39 inches wide x 26 inches deep x 32 inches high. Thermotron 7800 programmer/controller: for control of temperature and relative humidity. A Honeywell Truline microprocessor based thermal printing, circular chart recorder.
Bowser Technical Refrigeration Model H15R (modified) A mechanically and CO² refrigerated, electrically heated, steam humidity controlled chamber. Chamber size: 30 inches wide x 30 inches high x 32 inches deep. Thermotron 4800 Programmer/Controller: for control of temperature and relative humidity. Honeywell Truline microprocessor based thermal printing, circular chart recorder.