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rac3

RAC 3 Gas Sampler
The RAC 3-Gas Collecting Sampler is a wet-chemical system that samples ambient air for any pollutant gas in which there is a suitable chemical reagent (absorbing solution). The Sampler tests for sulfur dioxide (SO2), nitrogen dioxide (NO2), hydrogen Sulfide (H2S), ammonia (NH 3), aliphatic aldehydes (R-CHO) and other gases reactive to specific aqueous reagents. In its basic configuration, the RAC 3 Gas system is designed to collect samples of SO2, NO2, and a third (optional) gas simultaneously.

RAC 3 - Gas Sampler

In 1975, the 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 2-hour period. Sample degradation begins in the 20° (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 evaluation by standardized wet chemistry and spectrophotometric procedures.

Features

  • Meets or exceeds EPA reference method specifications for sampling SO2 in ambient air
  • Peltier cooling-heating system maintains SO2 reagent between 5° and 25° C for optimum sample stability at ambient temperature from -25° to 50° C.
  • Portable and easy to operate
  • Critical orifices provide 200 ml/min flow rate (nominal) through system
  • All orifices protected by inline filters and demistors to prevent clogging and flow reduction
  • Adjustable heater and fan prevents reagent freezing in non-thermoelectrically controlled bubblers
  • Sampler cabinets equipped with thermostatically controlled heater
  • Modified kit available for adapting to RAC 5-gas samplers to use thermoelectric module for SO2 sampling