Timed passive air sampler

Abstract

The invention discloses a timed passive air sampler, which comprises an air sampler main body, wherein the air sampler main body comprises a packaging barrel with an opening at the top, an adsorbent cage which is sheathed in the packaging barrel, a blocking pillar, an electromagnet and a timing driving circuit; a timing beginning sensor and a mounting bracket are arranged on the side wall of the packaging barrel; a rubber plug matched with the top of the packaging barrel is arranged at the top end of the adsorbent cage; a return spring is arranged between the bottom of the adsorbent cage and the bottom of the packaging barrel; a bayonet which can be pulled out to expose the packaging barrel and a sensing body corresponding to the timing beginning sensor are arranged on the adsorbent barrel; the blocking pillar is arranged on the mounting bracket and can move in the radial direction of the packaging barrel and be matched with the bayonet; the electromagnet is arranged on the outer wall of the bracket of the packaging barrel and can control the blocking pillar to be departed from the bayonet; and the timing driving circuit is connected with the timing beginning sensor and the electromagnet. The timed passive air sampler can implement the accurate automatic control of the sampling time, automatic packaging, and effectively improve the sampling accuracy of the passive air sampler.

Description

technical field [0001] The invention relates to the technical field of air harmful substance detection, in particular to a timing-capable passive air sampler. Background technique [0002] Under normal pressure, organic compounds with a boiling point in the range of 50° to 260° are collectively referred to as VOC (volatile organic compounds). These organic compounds mainly include: benzene, toluene, xylene, ethylbenzene, and styrene. , furniture, and household appliances use a large amount of materials containing VOC and formaldehyde in the production process, and these gases will gradually be released during subsequent use to pollute the indoor air environment; living, working, and studying in an environment where VOC or formaldehyde exceeds the standard People often experience symptoms such as eye pain, sore throat, headache, fatigue, irritability, etc., collectively referred to as "sick building syndrome", which can lead to multiple organ damage or leukemia in severe case...

AI Technical Summary

Problems solved by technology

[0007] 1) The sampling time record is inaccurate. The sampling time of passive air samplers is controlled and recorded by home users. Due to the non-professional nature of home users, the recorded sampling time may not match the actual sampling time, resulting in deviations in test results ;

[0008] 2) Improper operation of the passive air sampler after sampling may easily lead to detection failure. Due to the non-professional nature of home users, pollutants may enter the sealed bag during the sealing operation, or the sealing operation is not timely or the sealing is not strict , will cause the detection to fail

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