What is the sampling principle of atmospheric sampler?

Atmospheric sampler is a common instrument for collecting gases in atmospheric environment and workshop. Widely used in atmospheric environmental monitoring, health and epidemic prevention, labor protection, scientific research and other units, but also can be used with related instruments. By analyzing the sampled gas, we can know the pollution degree of harmful gas to the environment, and provide the actual situation of pollution to the relevant competent departments so as to take countermeasures to ensure people to have a healthy living environment. In the sampling device, three (upper, middle and lower) sampling tubes are fixed on the support tube, one for sampling the upper oil sample, one for sampling the middle oil sample and the other for sampling the lower oil sample. The upper end of the support rod is connected with the buoy, and the lower end is fixed on the fixed bracket at the tank bottom. When the liquid level rises and falls, the buoy floats and the sampling tubes also rise and fall, so the opening heights of the three sampling tubes are always kept at the specified sampling positions.