Dilution particle sampler and sampling method thereof

Abstract

The invention discloses a dilution particle sampler and a sampling method thereof in the technical field of environmental protection monitoring instruments. The dilution particle sampler comprises a sampling mouth, two sets of Pitot tubes and a temperature sensor, wherein a sample gas inlet tube is mounted at the right end of the sampling mouth; a heating band is mounted on the outer wall of the sample gas inlet tube; a flow sensor is mounted at the right end of the sample gas inlet tube; a diluter is mounted at the right side of the flow sensor through a pipeline; the right end of the diluter is connected with the inlet of a retention chamber through a pipeline; a particle cutter is connected to the right side of the outlet of the retention chamber through a pipeline; the temperature sensor and a pressure sensor are arranged at the left side of the particle cutter; the temperature sensor and the pressure sensor are in electric output connection with a singlechip; a diverter gas inlet tube is mounted at the bottom end of the particle cutter; the bottom end of the diverter gas inlet tube is connected with a diverter; a diverter gas outlet tube is mounted at the bottom end of the diverter; and the bottom end of the diverter gas outlet tube is connected with a sampling filter membrane through a pipeline.

Description

technical field [0001] The invention relates to the technical field of environmental protection monitoring instruments, in particular to a sampler for diluted particulate matter and a sampling method thereof. Background technique [0002] When collecting particulate matter samples in exhaust gas, it is difficult to directly collect particulate matter in exhaust gas because the temperature, humidity, and concentration of exhaust gas are too high. Therefore, after diluting the waste gas sucked into the sampler with clean gas, the mixed gas sample is collected. The method: while collecting exhaust gas, inject clean air to mix with the sample gas, dilute the sample gas, reduce its temperature, humidity, and concentration, and then sample the particulate matter, thus realizing the purpose of collecting particulate matter samples from the exhaust gas ; The disclosed particle sampling method is to connect a flow sensor in series before the suction pump to measure the flow of the g...

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of dilute particle sampler and its sampling method, to solve the two or more sampling filter membranes proposed in the above-mentioned background technology, the gas flow rate that the sampling filter membrane with little resistance passes through is big, and the gas flow rate with big resistance is large. The gas flow rate through the sampling filter membrane is small, which affects the accuracy of sampling

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