Intelligent air automatic sampler for occupational health

Abstract

The invention belongs to the technical field of automatic air sampling apparatuses, and particularly relates to an intelligent air automatic sampler for occupational health, which is program controlled, and can perform constant flow, continuous, equal time interval, absorption tube connected in series, and fixed-point real-time high-precision sampling. The intelligent air automatic sampler mainlycomprises an air inlet connecting pipe, an air outlet connecting pipe, a control valve with air inlets and air outlets, absorption tubes, a flowrate control sensor, a single chip and a suction pump. The program set by the single chip is used for controlling the opening / closing of the suction pump, the flowrate of the flowrate control sensor, the connection between the air inlet connecting pipe and the air outlet connecting pipe and the air inlets and the air outlets, the opening / closing of each air inlet or each outlet, and sampling time. The sampler enables the two neighboring absorption tubes to be connected in series, so as to satisfy the collecting requirements of different types of occupational health samples.

Description

technical field [0001] The invention belongs to the technical field of automatic air samplers, and in particular relates to an intelligent automatic air sampler for occupational hygiene that adopts program control and can perform constant flow, continuous, equal time intervals, series absorption tubes, fixed-point real-time and high-precision. Background technique [0002] As the occupational health department has higher and higher requirements for the production site and testing and evaluation work, the actual testing work in the daily testing or evaluation testing process of the production unit or technical service organization that has obtained self-inspection authorization needs to be carried out within a working day cycle. Continuous tracking detection or daily fixed-period detection on the same detection point. These samples are parallel samples, and other conditions should be exactly the same except for the sampling period. However, manual sampling cannot achieve the...

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Problems solved by technology

However, there are many defects in using this atmospheric sampler for occupational health sample collection: one, the solenoid valve is a steel product controlled by an electromagnet, and the occupational health collection site is mostly a factory, a workshop, and there is a high concentration of acid or Alkaline gas corrodes the solenoid valve; second, the solenoid valve generally requires a high degree of cleanliness for the medium. When collecting dust samples, fine dust is easy to enter the solenoid valve and affect the airtightness of the gas circuit; third, the air sampler connected in parallel The multiple absorption bottles are connected by the same gas path in turn, and cross-contamination between the absorption bottles is easy, which affects the accuracy of sample collection

In addition, GB / T160.29-2004 "Determination of Inorganic Nitrogenous Compounds in Air Toxic Substances in the Workplace" issued by the Ministry of Health requires the use of two absorption bottles connected in series to complete sample collection, while the Chinese invention patent (application number 201010174255.1) discloses This atmospheric sampler does not meet this requirement

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