I MIL-STD,-810D Downloaded from https://www.everyspec.com 19 Jllly1983 .. ‘METHOD 510~2 ., ,. .,. SECTION II,- .. .. c. SAND AND DUST ,, . .. . .. .. .. . . ,.. . . H-1 AUMANLS 11-1.1 M+UWIU@ . .. , ..,: s .,. ,,:----,.1’!~ 11-1.1:1 Rkwiu4M . ,, a.. The test facility shall consi.?tof “a’oh$rnber+nd:accessories to oontrol dust conc,entration, velocity, temperature, and humidity Of dust-laden ,. air. In order to”provide adequate Circulation of the duet-lagen.air, no more. ~ th~” 50 percent of the cross-eectional’area (normal to airflow) and 30 percent: of the volume of the test chamber shall be occupied by the .t$Atitem(s).
The chamber shall be provided with a means of maintaining and ve?ffYing the dust ,; concentration in circulation. A minimum acceptable means for doing this is by uae of a properly calibrated smoke meter and standard light sOurce.. % dust- laden air shall’be introduced into the test space in such a manner as to allcw”’ the air to become approximately laminar in flow befOre it’strikes the test ., .“. item. WARNING NOTE: Silica flour may present a health hazard. When using silica flour, assure that the chamber is functioning properly and not leaking; if a failure ‘ofcontainment is noted and “peoplemight have been exposed,,air .?amP>e?,.
should be obt,ainedand compared to the curr”tint th:,eshOl@ limit valuea of the’,.:.- American Conference of Government and Industrial,Hygienists’.,Ch?mberrePair.. , and/or other appropriate action should be taken before continuing use of the ~.: chamber. Care should be taken during all atepi”where exposureof people .tothe” eilica dust is possible. -,’. b. The dust used in this teit ehall be as outlined in”I-3.2d(1).” 11-1.1.2 ,~ ,,,, a. The required apparatus ccnsists of a chaicberor cabinet, together with,necessary air conditioning and circulation equipment with its auxiliary control instrumentalion, sand storage and moving equipment, and sand. . ,, -.~.
concentration measuring equipment, cap’able‘ofmaintaining and continuously monitoring the required condition throughout an envelope cf air surrounding the test item(s). (See General Requirement, 4.4.1.) Figures 510.2-1and :, 510.2-2 are schematic diagrams of typical facilities for this test”. : A data collection system,,eeparat~ from.the ch~b?r Controller?! :,. shali be employed to measure test .spaoeconditions. Readout charts.+h?ll,be..., readable to within at leaet 0“.6° C’(l° F). METHOD’”51O.2 19 Jllly’1.983’ 510.2-8”