Constant flow sampler and flow calibration method thereof

Abstract

The invention discloses a constant flow sampler comprising a cutter, a filter, a flow sensor and an air pump and further comprising an environmental temperature sensor, an environmental pressure sensor, a computer front temperature sensor, a computer front pressure sensor, a single chip, a display, a keyboard and a printer. The invention further discloses a flow calibration method of the constant flow sampler; the method comprises the steps as follows: (1) mounting a flow calibrator at an inlet of the cutter in a sealing manner; and (2) enabling a flow under the working condition of the constant flow sampler and a flow value under the standard condition to be equal to the flow value displayed by the flow calibrator. According to the constant flow sampler disclosed by the invention, as the sampling flow value (constant flow value) is the flow flowing through the cutter under the working condition and is consistent to the designed flow of the cutter, the mistake that the flow flowing through the flow sensor under the working condition is the sampling flow value in the past is corrected; and therefore, the collected samples are more typical and authentic.

Description

technical field [0001] The invention relates to a sampling device and a flow calibration method thereof, in particular to a constant current sampler and a flow calibration method, belonging to the field of environmental protection monitoring. Background technique [0002] Existing aerosol sampling equipment mainly includes: a particle cutter, a filter (usually a quartz filter membrane), an adsorbent, an air pumping power, a flow meter and a flow regulating device. A sampling filter membrane (such as quartz filter membrane, glass fiber filter membrane, tetrafluoroethylene membrane, acetic acid, nitrocellulose filter membrane, etc.) is installed in the filter to collect particulate matter samples in the air. [0003] The gas path of the existing sampler is connected in series with a filter in the gas path behind the particle cutter (hereinafter referred to as the cutter), a flow sensor is connected in series behind the filter, and a suction power is connected in series behind ...

AI Technical Summary

Problems solved by technology

The main reason is that after the gas passes through the cutter and the filter, the absolute pressure of the gas decreases due to the increase in the resistance of the filter membrane, so that the working condition flow rate through the cutter decreases, which deviates from the design value, resulting in the collection of samples lose authenticity

Images