! MIL-STD-81OC Downloaded from https://www.everyspec.com . ~ ,. . . MIL-STD-81OC MSTHOD 508.2 FUNGUS Section II 11.1 APPARAT@. The required apparatus consists of chambers or cabinets, together with auxiliary instrumentation capable of maintaining and monitoring the specific conditions of temperature and humidity and complies with 3.3.1, General Requirements. a. The chamber and accessories shall be constructed and arranged in such a manner as to avoid condensate dripping on.the teat item. b. The chamber shall be tented to the atmosphere to prevent the”build up of total pressure. c. Relative humidity shall be determined from temperature comparison method or an equivalent \ activity.
the dry bulb - wet bulb method approved by the procuring (1) When the wet bulb control method is used, the wet bulb assembly shall be cleaned and a new wick installed for each test. (2) The air velocity across the wet bulb shall not be less than 4.6 meters per second (900 feet per minute). I (3) The wet and dry bulb sensors shall not be installed in the discharge side of any local fan or blower used to create the requirements of 11.2.c(2). d. Provlaions shall be made for controlling the flow of air throughout the internal teat chamber space so that the air velocity shall be between 1 and 2 meters per second ( 197-394 ft/min). e.
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 3.3, General Requirements, Test Facilities and Apparatua). f. Continuous recordings of test section temperature and relstive humidity conditions shall be taken. I s. Readout charts shall be capable of being read with a resolution within 0.6° C,(1° F). h. The desired humidity shall be generated by using stemn, or distilled, demineralized or dionized water having a PH value between 6.o and 7.2 at 23° C (73° F). [ METHOD 508.2 508.2-8 4. .