![]() ![]() Integrated sampling is carried out by direct-reading instruments (e.g. It should not be used for reactive gases. Temperature and pressure should be recorded during sampling. Direct reading instruments can also be used for grab sampling. The sample is collected in an evacuated flask or plastic bag, sealed and sent to a laboratory where trace analysis is carried out by gas chromatography, IR spectrophotometry, etc. peak value of NH3 or Cl2 at a particular time. Grab sampling is used to measure concentration at a particular time (at least two samples within 5 minutes) e.g. Short period (instantaneous) sampling is called grab sampling and long-period sampling is called integrated sampling. It includes continuous monitors for leak detection, ventilation failure, equipment malfunction, etc. In area sampling, the air samples are taken at fixed places in a workroom or confined spaces to evaluate general concentrations of flammable, explosive, or toxic material in the air for the purpose of isolation or restriction to work or to design the control measures. In personal sampling, the sampling device is worn by the worker near his breathing zone to evaluate personal or individual exposure to him. Types Of Air Sampling 1.Personal Sampling To determine the types and effectiveness of the control measures provided, any change if necessary in them and new control measures to be provided.To determine type and concentration of exposure due to health hazards to workers. ![]() Osha’s some permissible exposure limits in parts per million (ppm).Types of sampling are also classified as. ![]()
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