Downloaded from https://www.everyspec.com MI@TD-810D 19July 1983 ~-~.3.2.~ ~. With the vac,uumpimp turned off”;‘thechamber shall be capable of maintaining any pressure altitude from sea level.to 300.0meters (10,000 feet) for a period of 10 rninutea,and’any altitude from 3000 meters (10,000 feet) to 18,000 meters (6o,000 feet) for a p.ariodof 20 minutes, with a loss not to exceed 5 percent of the total pressure ‘altitudeduring either time. A-1.3.3 air veloti. The bloifer”semployed for mixing and circulation of air-vaoor mixtures within the ixing circuit. the main chamber and the I sampling ~hamber shall be capable of p~oducing Outlet ai!
veloc:!ie.sbetween 300 and 600 meters per rnintite(1,000‘and 2,000’feet per minute)’. A-1.3.4 air temueru. The air”temperature”with”inthe teat chamber -. shall be controllable between 20° C and 24ooc 23° C (700F and 450° F f5° F) at.all points 1-1/2‘inches or further from the chamber ;alls. Within the 20° C to the’ 1200C (70° F to 250° F)’temperaturerange, no hot spot:.in excess of,40° C.(75° F) over the thermostat setting shall exist in’the’chamber atmosphere. For the’ 1200c to 24ooc (25ooF to 4500F) temperature range hot spot? in excess of 15° C .*. (25° F) above the thermostat setting are not permissible in the chamber” atmosphere.
Time required to raise the ambient air temperature from 20° C (70° F) to any desired value-within’titie’specified range shalk not exceed 60 minutes. .. ,. .. .. .. :..-.. ,, r. ,.. ,,-. ,, A-1.3.5, ‘~ ,,,,. r.. , . A-1.3.5.1 ~. Unle~i “otherwisespecified, instruments and controls shall be accurate within the following limits:. .),,,.,, ., a. Temperature indicator (inclidink thermostats): Zl”c”(3?° F) ,.; !. .,.,,. 0 b. .-,, Pressure indicator: S“kpa (:1‘psi) ,, ,’.,. I ,.,. c. Altimeter: ?1 percent .. ,.- I d. Thermostat:
~10C(~20F) .,, .,...,;;,., ,., ., 1 A-1.3.5.2 ~ Unle.qaotherwise gpecif+:d; eny~ronmental conditions induced within the cham~er’shall not,Vary in”~XceSs ‘ofthe ,f:llowinglimits:. a. Air or ‘mixturevelocity: 1.5 percent ~li’mktetisper”minute) . b. Altitudes: :2 p’ercent(in meters) c. Temperature: t3° C (-%° F) .. ., NOTES 1. ~. The explosion-proof testing chamber described herein”is intended for use in the accomplishment of explosion-proof teste ‘in.accordance . with this standard. ... ,, ., ,,. . .,. , METHOD 511.2 APPENDIX A 19 “July 1983 511.2-16