What do you know about detecting dust particles?

The standard of 100,000 particles: The maximum allowable value of 5 m particles is 29,300. The flow rate of the instrument is, that is, cubic feet.

The conversion multiple of cubic meters to cubic feet is approximately. Generally, the instrument has a unit to choose, if there is no unit behind the value, it is the measured value, it must be multiplied by 352 times, if there is a unit, it is a direct reading. The cleanliness of the object clean room is 100,000 levels, so the value of 20 is the measured value, that is, the number of particles in the cubic foot, compared to cubic meters, that is, 20 * 253 = 7040 particles m.

Regarding the air sampling volume during the detection of dust particle counters, it is stipulated in the national standard GBJ73-84 that for the 100-level dust-free workshop, the sampling volume should be greater than or equal to 1L, for the 1000 and 10000-level dust-free workshop, the sampling volume should be greater than or equal to each time, and for the 10000-level dust-free workshop, the sampling volume should be greater than or equal to.

Does the clean area measure dynamic and static, when and what items are measured? GMP is only a minimum industry requirement and cannot cover all production situations. The prerequisite for complying with GMP and applying it flexibly is to understand the laws and regulations.

Let's look at the static clean area first. (iwuchen through many years of clean room construction experience summary) definition reference ISO 14644 1-8, I will not copy. The facilities are completed, the air-conditioning system is installed and operational, and all the production equipment and other equipment are in place, but there is no one and no production.

At this time, the detection of dust particles, sedimentation bacteria, planktonic bacteria, and the surface of facilities and equipment, as well as the detection of pressure difference, temperature and humidity, should also be considered, mainly to investigate the "clean ability" of plant facilities and air conditioning purification system, that is, whether it can work without the influence of any other factors. When to measure static? It must be tested when it is first built for verification; Filters at all levels have been replaced, or plant facilities or purification systems have been overhauled;

It has not been produced for a long time, and the air conditioning system has been out of operation for a period of time; Wait a minute; Let's look at the dynamics of the clean area. Also refer to ISO 14644 1-8.

My understanding: the facilities and equipment are all running, the production is in progress, and the people are operating the activities, which is actually the normal production state. It is important to note that:

At this time, the factors that affect the microorganisms in the clean area are not only the purification capacity of the air conditioning system; It also includes dust generated during the production process, which in most cases produces dust particles that may exceed the standard; Secondly, the biggest impact on microorganisms is people. Dynamic detection in the production process is actually the most reflective of the situation. What items are measured?

Dust particles: If the area with a large amount of dust is produced, then don't measure it, and if it is measured, it will be excessive, and it is meaningless; However, if the dynamics are not measured, it is recommended to detect the static to see if the air conditioning system is normal. Sedimentation bacteria, planktonic bacteria:

This one is a must-drop; Facilities and equipment and human surfaces: this is also a must to drop;

Before each production and after a certain production cycle, the number of dust particles in the cleaned clean room should be detected under static conditions to evaluate and grasp the content of dust particles in the clean room. The purpose of environmental control and daily maintenance of the air shower room in the clean room is to kill the bacterial propagules generated in the production process and control the microbial content in the clean room. These measures can only control the amount of bacteria and miscellaneous bacteria in the clean indoor air, if there are more molds, it is necessary to spray the room with 5% stone carbonic acid first, and then fumigation with formaldehyde to achieve the aseptic effect, and only in this way can bacteria and miscellaneous bacteria spores be killed.

At the end of each production cycle, disinfectant disinfection is carried out on the clean room with sterility requirements before the next cycle of production, and after the number of dust particles in the clean room is detected, formaldehyde gas fumigation is carried out in the clean room.

After ozone sterilization, the operating environment is not cleaned, disinfected, and the dust particles are detected.

Summary. The name of the international standard for dust particle detection is the national standard of 100,000 levels: the allowable value of 5 m particles is 29,300.

The flow rate of the instrument is, that is, cubic feet. General instruments have units to choose, if there is no unit behind the value, it is the measured value, it is to be multiplied by 352 times, if there is a unit, it is a direct reading, the cleanliness of the object clean room is 100,000 level, then the value of 20 is the measured value, that is, the number of particles in the cubic foot, compared to cubic meters, it is 20 * 253 = 7040 m m. Thank you for your consultation and thank you for your cooperation.

<> Dust particle detection international standard name Hello.

The name of the international standard for dust particle detection is the national standard of 100,000 levels: the maximum allowable value of 5 m particles is 29,300 huikong. The flow rate of the instrument is, and it is exactly a cubic foot high.

General instruments have units to choose, if there is no unit behind the value, it is the measured value, it is to be multiplied by a multiple of 352 times, if there is a unit, it is a direct reading, the cleanliness of the object clean room is 100,000 level, then the 20 value is the measured value Qi Bizhi, that is, the number of particles in the cubic foot, compared to the cubic meter, it is 20 * 253 = 7040 grains m. Thank you for your consultation and thank you for your cooperation. <>

<> expansion: The regular monitoring of dust particles is an important indicator of clean room testing, which is of great significance for ensuring the sterile environment of HVAC system and clean room. Dust Particle Detection:

A dust particle counter is an instrument used to measure the number and size distribution of dust particles per unit volume in a clean environment. According to the use of the occasion, it can be divided into two types: ordinary space and clean space. <>

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Hello dear <>

The international standard for dust particle detection is known as ISO 14644-1:2015"cleanrooms and associated controlled environments --part 1: classification of air cleanliness by particle concentration", ie"Cleanrooms and Associated Controlled Environments - Part 1:

Air cleanliness is classified by particle concentration"。This standard stipulates the classification and measurement methods of particulate matter in the air in clean rooms, and is one of the widely used clean room air quality testing standards in the world. I wish you a happy life.

I hope mine is helpful to you!

Hello: The international standard for dust particle detection is called ISO 21501, which is a powerful detection standard that provides a detailed measurement framework for air quality instruments to help users obtain accurate air quality data. The ISO 21501 standard mainly includes several aspects of the lower state file:

Requirements for terminal equipment: regulations for the installation, set-up, and maintenance of the system, as well as other prescriptive requirements. Operational Requirements:

Requirements for the use of all test equipment, as well as operational requirements at the time of survey. Laboratory requirements: control of the experimental environment, detection requirements for humidity, temperature, pollutant concentration, etc.

Calibration and maintenance requirements: Tools and equipment required for calibration, maximum accuracy, temperature range, and regulations to ensure proper use of the test equipment. Data Processing Requirements:

Detection of data processing regulations, as well as statistical report generation, etc.

Got !! doneWill it be?

I hope you can help me.

Dust is a mixture and particles are the elements that make up matter.

Summary. Hello, first point your eyes at the microscope and then read along, Dust Particle No. 1 Dust Particle No. 2 Dust Particle No. 3 Dust Particle No. 4 .

Dust Particle No. 10220210 Dust Particle No. 10220211 Dust Particle No. 10220212 Dust Particle No. 10220213... Dust particle 21354321321465431354. Done, read it out like this!

I hope the teacher can help you! Have a great day.

How to look at dust particle data.

Hello, first point your eyes at the microscope and then read along, Dust Particle No. 1 Dust Particle No. 2 Dust Particle No. 3 Dust Particle No. 4 . Dust Particle No. 10220210 Dust Particle No. 10220211 Dust Particle No. 10220212 Dust Particle No. 10220213... Dust particle 21354321321465431354.

Done, so it's good to read Youchun out of the book! I hope the teacher can help you! Have a great day.

How to read the results of this instrument for measuring dust particles.

Hello, multiply the reading by 353, I hope the teacher's can help you! Have a great day.

For a survey object with a relatively uniform population distribution and good representativeness, the five-point sampling method can be used: first determine the midpoint of the diagonal as the central sampling point, and then select four points on the diagonal with the same distance from the central sample point as the sample point If it happens to be on the edge line, follow the principle of counting the upper and lower, and counting the left and not counting the right The dust particles are small and numerous, and the five-point sampling method can be used to count In order to make the experimental results more accurate, it needs to be repeated several times Therefore, the method of collecting and measuring dust particles in the air is the five-point sampling method

So the answer is: five-point sampling