Patent RU-2511022-C2 (RU)
Inventor: KOCHETOV OLEG SAVEL EVICH
IPC: G01N5/00
Filed: 2011-12-08
Granted: 2014-04-10
Abstract: FIELD: machine building. 
     SUBSTANCE: invention relates to machine building, in particular, to devices of safety systems. The method of multi-criteria assessment of comfort of a working area in production premises consists in determination of concentration of air-dispersed admixtures and parameters of microclimate of air volume, first they determine working area air dustiness as the first criterion of its comfort. For this purpose they prepare and tune equipment for determination of pure filter mass, then the pure filter is weighed on a scale. After this they tune a plant for forced deposition of a dust aerosol in the working area of the production room. Then air is sampled with capture of dust particles on the filter, the filter is weighed with caught particles of dust, the concentration of the dust aerosol is calculated in mg per cubic metre. Afterwards they assess dustiness of working area air, comparing the obtained concentration with the permissible value. Further they measure air temperature using a thermograph or psychrometer, air moisture using a stationary or an aspiration psychrometer, and they determine speed of air movement using a cup or a windmill anemometer. On the basis of the produced parameters - air temperature in the working area, its moisture and speed of movement, they calculate extent of comfort, afterwards they assess comfort of microclimate parameters according to the following scale: 1 - very hot; 2 - too hot; 3 - warm, but nice; 4 - feeling of comfort; 5 - cool, but nice; 6 - cold; 7 - very cold. Then   they select an indicator powder from the entire set of sorbents, available gas analysers with account of statistic data of this or that production type, then appropriate indicator tubes are prepared for each detected air admixture, filling them with the appropriate indicator powder, and a sample is taken with the help of a gas analyser. At the same time a certain volume of air passes via an indicator tube for a certain period of time, afterwards they analyse the taken sample, for this purpose they apply an indicator tube to a standard scale available within a set of this or that type of a gas analyser, and by the length of the indicator powder that changed its colour they determine concentration of the harmful substance in the inspected air. Then actual concentration of hazardous substance produced as a result of the experiment, is compared with the maximum permissible concentration (MPC) by norms, and the comparable assessment table is filled in, then, using the tables, they detect substances with effect of summation, and perform calculations according to the following formula:              C   1         M   P     C   1         +         C   2         M   P     C   2         +   ⋯   +         C   n         M   P     C   n         ≤   1,         
 where C 1 , C 2 , … C n  - actual concentrations of substances in atmospheric air, mg/m 3 ; MPC 1 , MPC 2 , … MPC n  - maximum permissible concentrations of the same substances, mg/m 3 . Then with account of the fact that whenever several substances with summation of action are jointly present in atmospheric air, the sum of their concentrations should not exceed one, the conclusion is made on compliance with norms of each of the specified substances separately and with their simultaneous action. 
     EFFECT: higher efficiency, effectiveness and reliability of system actuation. 
     7 dwg, 1 tbl