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System for calibrating particulate matter measuring instruments and calibrating method of system

A technology for calibrating systems and measuring instruments, used in measuring devices, particle suspension analysis, scientific instruments, etc., to achieve the effects of accurate value, increased effective control, and reduced size

Active Publication Date: 2016-04-13
HENAN PROVINCE INST OF METROLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the calibration device of the relevant particle measuring instrument has not been found. In view of the above situation, it is very necessary for the local quality and technical supervision departments to establish the calibration device and calibration method specification of the particle measuring instrument to verify the particle measuring instrument of different manufacturers and different users. to standardize the verification of particle measuring instruments

Method used

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  • System for calibrating particulate matter measuring instruments and calibrating method of system
  • System for calibrating particulate matter measuring instruments and calibrating method of system
  • System for calibrating particulate matter measuring instruments and calibrating method of system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one: see figure 1 , figure 2 , Figure 4 — Figure 7 , a particle measuring instrument calibration system, including sequentially connected compressed air processing device, dust generator 5, heating device 34, electrostatic neutralizer 35, PM10 standard cutting head 36, PM2.5 standard cutting head 37 and uniform mixing box 6. The compressed air treatment device includes an air compressor 1, a cold dryer 2, a three-stage filter 3 and a buffer tank 4, and the lower part of the uniform mixing box 6 is connected with a dust sample collector and a dust removal device 7; Said homogeneous mixing box 6 comprises a cylindrical sedimentation mixing chamber 8, a mixing section arranged on the upper part of the sedimentation mixing chamber 8 and a sampling vent section arranged at the lower part of the sedimentation mixing chamber, and said mixing section comprises a cylindrical dust feed pipe 9. A mixer 10 with a single leaf hyperboloid structure arranged in the du...

Embodiment 2

[0030] Embodiment two: see figure 1 , image 3 — Figure 7 , the structure of the present embodiment is basically the same as that of Embodiment 1, and the same parts will not be repeated. The difference is that the dust sample collector includes three constant-velocity dust collectors that are circumferentially distributed around the axis of the settling mixing chamber 8. The sampling head 15 is connected to the sampling tube 16 arranged at the bottom of the three isokinetic sampling heads 15, and the three sampling tubes 16 are respectively connected to the first filter membrane 20, the second filter membrane 21 and the calibrated instrument 22, the first filter membrane 20 and the The second filter membrane 21 is connected with a sampling device 23 at the same time.

Embodiment 3

[0031] Embodiment three: see figure 1 — Figure 7 , a calibration method using the particulate matter measuring instrument calibration system described in Embodiment 1 or Embodiment 2. After the clean compressed air is passed into the dust generator, the dust samples generated by the dust generator are treated to prevent static electricity, and then enter the The standard cutting head and the uniform mixing box are uniformly mixed with compressed air in the uniform mixing box, and the dust samples collected by the constant velocity sampling head enter the first filter membrane, the second filter membrane sampler and the calibrated instrument respectively; the sampling device Adjust the flow rate to be the same as the flow rate of the calibrated instrument, and read the reading of the calibrated instrument at the same acquisition time; at the same time, use a high-precision balance to weigh the two filter membranes; calculate the weight of the two filter membranes The ratio of...

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Abstract

The invention belongs to the technical field of dust detection, and discloses a system for calibrating particulate matter measuring instruments and a calibrating method of the system. The system comprises a compressed air processing device, a dust generator and an evenly-mixing box, wherein the compressed air processing device, the dust generator and the evenly-mixing box are sequentially communicated. A dust sample collector and a dust removal device are communicated with the lower portion of the evenly-mixing box. The evenly-mixing box comprises a sedimentation mixing chamber, a mixing section and a sample discharging section. The mixing section comprises a dust feeding pipe, a mixer and an upper transition cavity, an air diluting bin is formed between the dust feeding pipe and the mixer, a plurality of compressed air inlets are evenly formed in the portion, corresponding to the air diluting bin, of the dust feeding pipe in a communicated mode, and mixing through holes for diluting air in a non-directional mode are evenly formed in the pipe wall of the mixer. By means of the system and the calibrating method, the dust generation amount, the dilution air flow, the dust dilution concentration, the sample flow and the evenness of mixing of dust and dilution air are all effectively controlled, and therefore measuring instruments within different dust mass concentration ranges can be calibrated.

Description

technical field [0001] The invention belongs to the technical field of dust detection, and in particular relates to a calibration system and a calibration method for a particle measuring instrument. Background technique [0002] Particulate matter measuring instruments have been widely used in the monitoring of particle concentration in air environment quality, workplaces, vehicles and other occasions. Different manufacturers have different names for it, such as particle meter, inhalable particle meter, light scattering particle concentration meter, air particle concentration monitor, atmospheric particle online analyzer, laser particle size analyzer, etc. Generally speaking, these instruments can be collectively referred to as particle measuring instruments. Particle measuring instruments have the principle of β-rays, light scattering, and micro-oscillating balances. Due to the different quality control techniques and calibration devices used by different principles of part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
Inventor 樊玮邹君臣崔耀华邹晓华师恩洁暴冰张志清李建鹏孙彦楷陈睿锋周新刚何力人周文辉张家铭
Owner HENAN PROVINCE INST OF METROLOGY
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