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| RAC 3 & 5 New Environmental Gas Sampler Impinger , Air Impinger Sampler - Lokal, Potakit I Portable Water Testing Laboratory for Microbiological & Pysico Chemical | |||||||
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RAC 3-Gas Sampler
The RAC 3-Gas Sampler is a wet-chemical system that samples ambient air for up to three different pollutant gases simultaneously and features a thermoelectric system to assure maximum accuracy for SO2 sampling. RAC 3-Gas Sampler Overview The 3-Gas Sampler tests for sulfur dioxide ( SO2) , nitrogen dioxide ( NO2) , hydrogen sulfide ( H2S) , ammonia ( NH3) , aliphatic aldehydes ( R-CHO) and other pollutant gases for which there is a suitable reagent ( absorbing solution) . This sampler can be used virtually anywhere that line power is available to serve widely diversified gas sampling requirements. In its basic configuration, the 3-Gas system is designed to collect samples of SO2, NO2 and a third ( optional) gas simultaneously. Modular components permit easy changes in sampling train configuration - except for the SO2 arrangement ( Station 1) - to meet varying sampling needs. MAXIMUM SO2 SAMPLING ACCURACY Tests performed by the U.S. Environmental Protection Agency ( EPA) revealed that the accuracy of established wet-chemical SO2 sampling procedures is adversely affected by high ambient temperatures. At 50° C ( 122° F) , for example, about 75% of the SO2 in a collected or stored sample will be lost because of thermal instability within a 24-hour period. Sample degradation begins in the 20° C ( 68° F) range, with an initial loss factor of approximately 0.9% in 24 hours, and progresses at an increasing rate as the ambient temperature rises. The rate of decay increases five-fold for every 10° C increase in temperature over the range of 20 to 40° C ( 68 to 104° F) . The RAC 3-Gas Sampler design eliminates this problem in SO2 sampling! It features a rugged solid-state thermoelectric ( Peltier Effect) cooling-heating system that maintains the temperature of the SO2 bubbler and reagent between 5 and 25° C ( 41 and 77° F) in an ambient temperature range from -25 to 50° C ( -13 to 122° F) . As a result, all the SO2 collected during a sampling cycle is preserved for optimum accuracy of sample evaluation by standardized wet chemistry and spectrophotometric procedures.
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