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| New Star Environmental Gas Sampler Impinger RAC-3 / RAC-5, Air Impinger Sampler - Lokal, Potakit I Portable Water Testing Laboratory for Microbiological and 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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