Questions regarding sampling settings
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The regulations require that when sampling hazardous substances toxic or harmful to the human body, or flammable and explosive materials under pressure, steel cylinders should be used for sampling, along with the installation of personal protection enclosures or other protective measures. ”May I ask under what device and medium conditions is such a requirement needed? It would be best if there are pictures.
1. Select appropriate sampling points to ensure the samples are representative. 2. Sampling is carried out at atmospheric pressure; when the gas pressure is close to atmospheric pressure, the gas sample is usually introduced by changing the level of the liquid in the sealing container. 3. Sampling under positive pressure: when the gas pressure is higher than atmospheric pressure, simply opening the valve of the sampling tube will allow the gas to flow into the gas sampler. 4. Sampling is carried out under negative pressure; for gases with low negative pressure, a flow-type gas pumping pump can be used to extract the gas sample.