Dust detection methods, what are the methods of dust detection

Dust detection includes weighing method, capacitance method, ray method, light scattering method, light absorption method, electrostatic induction method, etc. Gravimetric method: The dumbest of all dust detection methods, but also the most accurate.

Capacitance method: The measurement principle is simple, but the linear relationship between the capacitance measurement value and the concentration is not a correspondence, and the measured value of the capacitance is easily affected by the phase distribution and flow pattern change, resulting in a large measurement error. Ray Method:

Dust detection includes weighing method, capacitance method, ray method, light scattering method, light absorption method, electrostatic induction method, etc.

1. Weighing method: Weighing method is the most stupid and the most accurate method of all dust detection methods.

2. Capacitance method: The measurement principle of the capacitance method is simple, but the measured value of capacitance and the concentration are not a corresponding linear relationship, and the measured value of capacitance is easily affected by the change of phase distribution and flow pattern, resulting in a large measurement error.

4. Light scattering method: light scattering technology uses the frequency and duration of the flash reflected by the particles in the air stream to measure the content of particles, which has an overwhelming advantage over other technologies, and greatly reduces the error caused by the humidity in the air flow to an insignificant level.

5. Light absorption method: when the light wave passes through the linear substance, it will interact with the matter, and part of the light wave is absorbed by the medium and converted into heat energy: part of the light wave is scattered by the medium and deviates from the original propagation direction, and the remaining part still passes through the medium according to the original propagation direction.

The relationship between the light intensity of the permissive part and the incident light is in accordance with Lambert-Beer's law. Based on Lambert's Beer's law, the light-absorbing dust concentration sensor calculates the dust concentration by measuring the incident and exit light intensity, and the method accurately measures the dust concentration in high-concentration gas-solid two-phase flow.

The test report required for the dust detector includes the following aspects:

1.Calibration report: The calibration report refers to the calibration results of the dust detector in various dust environments, as well as the model of the calibration equipment, the verification date, the verification agency and other information.

2.Operation report: The operation report refers to the parameters recorded by the dust detector during use, such as measurement results, operation time, alarm records, etc.

3.Maintenance report: The maintenance report refers to the record of the daily maintenance and maintenance of the dust detector, including the maintenance time, maintenance personnel, maintenance content, etc.

4.Test report: The test report refers to the results of the test of the dust detector, including the test date, test data, test standard, test method, test institution and other information. The test report is generally provided by a professional testing institution.

The above report can be used to evaluate the residual energy and condition of the dust detector and determine whether maintenance or replacement is required. At the same time, it can also be used for inspections and audits by regulatory agencies.

A dust detector needs an inspection report to ensure that it is in working order. The dust test report should include the dust content in the sample to be tested, and interpret and analyze the test results. The report contains detailed information such as the concentration of the hazardous substance, the volume of the air to be sampled, the sampling time and the location of the sampler, and it can also provide the necessary detection conditions, units and measurement methods.

In addition, dust detection instruments need to be calibrated and tested regularly to ensure that the results reflected are accurate and reliable, and the report should also include a record of the instrument's calibration and maintenance.

It includes data such as dust concentration and particle size at the time of detection, which is an important basis for assessing the degree of dust hazard in the workplace. 2.Device Detection Data:

Including the model of the dust detector, the accuracy and reliability data of the front section of the detection instrument, etc., which is an important basis for evaluating the performance and accuracy of the detector. 3.Security Assessment Report:

According to the test results, the recommended measures and protective measures are given, as well as the assessment of the current dust hazard degree, so that the relevant departments can take corresponding measures. The reason for the above is to ensure the accuracy of the detection results of the dust detector, as well as to assess the degree of dust hazards in the working environment, and to better carry out safety protection and risk control. At the same time, the recording of the performance and accuracy data of the equipment also helps the maintenance and adjustment of the dust detector to ensure its detection accuracy.

Finally, the safety assessment report is based on the further analysis of the test results and the recommendations and protective measures for the detection results to ensure the safety of the workplace and the health of people.

Legal analysis: the allowable dust concentration value is the highest allowable dust concentration stipulated by the relevant national regulations. Different plants have different requirements for liquid swimming acres.

The dust concentration in the general workplace shall not exceed 10mg m3. The health standard stipulates the maximum allowable concentration of harmful substances in the air in the workshop and in the atmosphere in the residential area. For example, the maximum allowable concentration of general dust in the workshop air is 10 milligrams of cubic meters, and the maximum allowable concentration of dust containing more than 10% free silica is 2 milligrams of cubic meters.

Legal basis: Work Safety Law of the People's Republic of China Article 29 The design, manufacture, installation, use, testing, maintenance, transformation and scrapping of safety equipment shall comply with national standards or industry standards. Production and business operation units must carry out regular maintenance and maintenance of safety equipment, and regularly inspect to ensure normal operation and grinding.

Maintenance, maintenance, and testing shall be recorded and signed by relevant personnel.

Dust inspection standards.

National standard: The judgment standards for the management of dust exposure concentration in coal mine workplaces are as follows:

Types of dust. 1. Free SiO2 content (%)

2. Respirable dust concentration (dose m3).

3. Coal dust:

4. Rock dust: 5

5. Cement dust:

Coal dust (free SiO2 content < 10%), coaldust (freeSiO2< 10%)

Total dust 46 exhalation dust how to more effectively prevent and control dust.

First, the reform of the process and the transformation of the manufacturing of electronic equipment is the fundamental way to avoid the harm of dust. It should start from the production process design, the free choice of electronic equipment, and the electronic equipment that meets the dust-proof requirements of the dust-producing machinery before leaving the factory. For example, the use of closed wind pipelines for transportation, negative pressure sand suction to avoid dust flying, the use of silicon-free substances instead of quartz, the use of iron shot sandblasting instead of quartz sandblasting, etc.

2. Wet operation is an economical and easy effective measure to avoid dust flying. It can also be used for jobs that can be wet manufactured. For example, wet rock drilling, erosion roadway, air purification and air intake in mines, wet crushing or spray sprinkling of quartz and ore, wet mixing in glass and porcelain industry, green sand modeling in foundry industry, wet unpacking sand removal, chemical sand removal, etc.

3. Sealing, suction, and dust removal, and the closed suction and dust removal method should be used for dust production posts that cannot adopt wet operations. All the main equipment that can produce dust should be sealed as much as possible, and use local mechanical suction to maintain a certain negative pressure in the closed electronic equipment to avoid dust escape, and the dusty air taken out must be purified by dust removal and purification to be discharged and prevent water from polluting the atmosphere.

Health care measures. To prevent and control the harm of dust to human health, the first step is to annihilate or reduce the source of occurrence, which is the most obvious measure. The second is to reduce the concentration of dust in the air.

Finally, it is necessary to reduce the chance of dust transfer to the human body and reduce the harm of dust. Health care measures belong to the last link in the prevention and control, although they belong to auxiliary measures, they still occupy the most important position, and they also include the following aspects:

Personal protection and personal hygiene. For operations where the dust concentration does not reach the allowable concentration standard for a period of time due to the conditions, the operator wears a suitable dust mask and becomes the most important measure. Dust masks should have high dust filtration rate, air permeability, and be lightweight, so as not to seriously affect workers' vision and operation.

Carrying out physical exercise and paying attention to nutrition is of certain significance to enhance physical fitness and improve resistance. In addition, you should pay attention to personal hygiene habits, follow the dust-proof operation procedures, and strictly implement the system of wearing dust masks and not working at work.

Pre-employment and regular medical check-ups. For new workers engaged in dust operations, it is necessary to carry out health examinations, the main purpose is to find the contraindications to dust operations and as physical health information, and the purpose of regular physical examinations is to find the harm of dust to physical health in the later stage, and to find out that there are diseases that should not be engaged in dust operations, and to recall them as soon as possible.

National standard: The judgment standards for the management limits of dust exposure concentration in coal mine workplaces are as follows:

Dust type: Free SiO2 content (%)Respirable dust concentration (mg m3), coal dust 5

Rock dust 5 10

50 cement dust 10

Coal dust (free SiO2 content < 10%), coaldust (freeSiO2< 10%)

Total dust 4 6 exhalation dust.

Is it a national standard or a dust detector standard made by a company?