Downloaded from https://www.everyspec.com MIL-STD-810D 19 JuIY.1983 METHOD 508.3 .. FUNGUS , ., . .. SECTION II . . ;11-1””~ ‘II-1.1 I@JW-L& a. The required apparatus consi;ta of chambers or cabinets, together with auxiliary instrumentation capable of maintaining and monitoring the specific conditions of.temperature and humidity, that oomply with 4.4.1 and 4.4.2, General Requirements. ~ . b. The chamber.~d accessories shall be constructed and arranged in such ‘amanner as to prevent,.condensation from ,drippingon the test item. : .C. The chamber shall be vented to the “atmosphere.to Prevent’the buildup of pressure. ,:, : , . . ,. 11-1.2 . . ,. a.
Relative.humidity shall be’determined by employing either solid-state ‘sensors,whose,calibration is not affected by water condensation or by an .approVed.!qui,valent method such aa fast-re??t.inswet-bulb/dry-bulbsensors. Lithium chloride sensors are not recommended because of their sensitivity to water. (1) When”the wet-bulb control rnet’hodis used, the wet-bulbasaembly aha”llbe cleaned,and a new ,wickinstalled,f.Oreach test. .- (2) The meters per second air velocity across the wet bulb shall not be less than 4.6 (900 feet per minute). (3) ,The discharge side of II-1.2a(2). wet- and dry-bulb seneors shall,not be installed in the any local fan or blower used to create the requirement of b.
Provisions shall be.made for controlling the flow of air throughout the internal test chamber apace so that the air velocity shall be between O.5 and 2 meters per second (98 to 394 ft/min). . c. Free circulation of air around the test item shall be maintained, and the contact area of fixtures supporting the test item shall be kept to a minimum. (See General Requirements, 4.5.2.) d. Unless otherwise specified, the test chamber temperature and relative humidity shall be recorded continuously. e. Readout charts shall be readable to within *O.6° C (~1OF). METHOD 508.3 508.3-7 19 July 1983