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This instrument is a successful product jointly developed with Nanjing University of Science and Technology and other units according to the requirements of the new GMP (2010 version). The overall body of the product is made of 316L stainless steel. The laser sensor uses an all-semiconductor laser and a semiconductor photodiode receiver to ensure the stability of the light source and the accuracy of the signal receiver. The scattered light in the scattering cavity is greatly reduced, and the signal to noise ratio of the sensor is improved. It adopts LCD large-screen display and PVC diaphragm switch control to make the display data clear and easy to operate. The instrument can automatically determine various purification levels according to the criteria selected by the customer. This product is widely used in medical, pharmaceutical, electronic, chemical, optical, food, cosmetics, biological products, aerospace and various testing institutions for the detection of dust particles.
The dust particle counter is an instrument for measuring the number and particle size distribution of dust particles per unit volume in a clean environment. It can be widely used in various provinces and municipalities drug testing institutes, blood centers, epidemic prevention stations, disease control centers, quality supervision institutes and other authoritative institutions, electronics industry, pharmaceutical workshops, semiconductor, optical or precision machining, plastics, painting, hospitals, environmental protection, Production companies and scientific research departments such as inspection offices.
development path
The particle counter was developed by microscope, and it has undergone the processes of microscope, settling tube, sedimentation instrument, centrifugal sedimentation instrument, particle counter, laser air particle counter, PCS nano laser air particle counter. The laser air particle counter test is fast and dynamic. Widely distributed and unaffected by human factors, it has become a mainstream product in many industries.
Fundamental
Particles in the air scatter under the illumination of light. This phenomenon is called light scattering. Light scattering is related to particle size, wavelength of light waves, refractive index of particles, and absorption characteristics of light by particles. However, in terms of scattered light intensity and particle size, there is a basic rule that the intensity of the scattered light of the particles increases as the surface area of ​​the particles increases. Thus, as long as the intensity of the scattered light is measured, the size of the particles can be inferred, which is the basic principle of the light scattering type particle counter.
Particle counter measurement principle
In fact, each particle produces a weak intensity of scattered light, which is a small pulse of light that needs to be amplified by a photoelectric converter to convert the light pulse into an electrical pulse with a large signal amplitude, and then through the electronic circuit. Further zooming in and discriminating to complete the counting of a large number of electrical pulses. At this time, the number of electric pulses corresponds to the number of particles, and the amplitude of the electric pulses corresponds to the size of the particles.
The specific working principle of the dust particle counter: the light from the light source is focused by the lens group in the measuring cavity. When each particle in the air quickly passes through the measuring cavity, the incident light is scattered once to form an optical pulse signal. The optical signal is sent to the photodetector through the lens group 2, and is converted into an electrical pulse signal in proportion, and then amplified and screened by the instrument electronic circuit to pick up the required signal and display it through the counting system.
It should be noted that although the instrument is called a "counter", the ability of the instrument to resolve particle size is more important. Since the counting of electrical pulses is simple, it is important to determine the size of the particles. [1]
Traceability
The Measurement Method clarifies the accuracy and reliability of the unity and quantity of the measurement unit. Whether in production, management or scientific research, measurement is an important guarantee for maintaining normal social and economic activities. In order to ensure the consistency and accuracy of a certain parameter value in the country, the state can trace the value of the measuring instrument to the national measurement standard, and realize the accuracy of a certain quantity of the country, and establish a perfect national top-down Quantitative traceability system. Its main purpose is to ensure the normal operation of various economic activities such as production, management and scientific research through the calibration of the measuring instruments in use.
The particle counter is a nationally prescribed measuring instrument. After a period of use, its optical system and detection system will change, such as aging of the light source, reduction of luminous efficiency or misalignment of the focus, contamination of the lens, and thus the conversion sensitivity of the whole machine changes. Therefore, according to the requirements of JJF1190-2008 "Dust Particle Counter Calibration Specification", it should be regularly calibrated to the Building Energy and Environmental Testing Center every year to adjust all aspects of the instrument to obtain the best working condition.
The main components
The light source is a key component of the dust particle counter and has a large impact on the performance of the instrument. The light source requires high stability, long life and no interference. The source of the laser dust particle counter has two kinds of common light sources and laser light sources. The common light source is a iodine-tungsten lamp, which has a large volume, high heat generation and short life, and needs to be preheated after starting up. The laser light source is a laser, which has small volume, high stability and long service life. It is often integrated with the detection cavity and the photodetector to form a sensor. Common laser sources are HeNe lasers and laser diodes. The laser dust particle counter using a common light source has a low response to a particle signal of 0.3 μm or less, and its signal amplitude is almost the same as the noise amplitude of the counter itself, and the signal is hardly detected from the noise. Such instruments, although labeled with a channel of 0.3 [mu]m, are only suitable for the determination of particles larger than 0.3 [mu]m, especially above 0.5 [mu]m. Due to the good monochromaticity of the laser and the stable and stable light energy, the laser dust particle counter using the laser source has a high signal-to-noise ratio (SNR). Some of these instruments can detect 0.1 μm particles.
classification
1. According to the test principle: light scattering test (white light, laser), microscopy test, weighing method test, DMA test (particle size analyzer), inertial test, diffusion test, condensation test (CNC) Wait.
2, according to the flow rate: small flow 0.1cfm (2.83L / min) large flow rate 1cfm (28.3L / min), GMP new regulations also have 50L / min, 100L / min flow of the instrument;
3, by shape, size: hand-held, desktop
4. Press test channel: single channel (measuring only one kind of particle diameter); dual channel (testing two kinds of particle diameters); multi-channel (testing multiple particle diameters)
5, other: application field of particle counter
Precautions
1. Do not start the counter when the inlet tube is covered or blocked.
2. The laser dust particle counter should be used in a clean environment to prevent damage to the laser sensor.
3. Do not measure mixed gases (such as hydrogen and oxygen) that may react. This gas may also explode inside the counter. To test these gases, contact the manufacturer for more information.
4. No high pressure decompression equipment (such as high pressure diffuser) should not sample compressed air. All particle counters are designed to operate at one atmosphere.
5. Water, solution or other liquids cannot enter the sensor from the inlet tube.
6. The particle counter is mainly used to test the clean environment of the purification workshop. When the measured material has loose particle material, dust source and spray, it must be kept at least twelve inches away from the inlet pipe. In order to avoid contamination of the sensor and piping with the above particles and liquids.
7. At the time of sampling, the gas contaminated by the gas discharged from the counter itself or by the counter is sampled.
8. When connecting an external printer or connecting an external temperature and humidity sensor, you need to turn off the counter first; when performing the printing operation, the printer must have printing paper, otherwise the print head will be damaged.
Latest upgrade features
Date and time display;
USB high speed communication interface;
RJ-45 remote control communication interface;
Built-in COM serial printer interface;
Count over-limit alarm: The instrument can set the count over-limit alarm of six levels (corresponding to ISO 4 to 9) of level 1, 10, 100, 1000, 10000, 100000, and 1000000; in accordance with ISO14644-1 / GB50073-2001 (CLASS 4, 5, 6, 7, 8, 9) 2010 version of GMP (A, B, C, D D level static and dynamic two state measurements) , FS-209E (10, 100, 1000, 10000, 100000, 300,000, 1000000) and other levels of testing in line with JJF-1190-2008 dust particle counter metrology and calibration specifications and JIS B9921: 1997 every five minutes ≤1
Data memory, can store 1000 sets of measurement results; can store 8000 sets of measurement results; can store 100000 sets of measurement results;
Built-in sensors measure temperature, humidity and record storage;
8 particle size channels can simultaneously measure 0.3μm, 0.5μm, 0.7μm, 1.0μm, 2.0μm, 5.0μm, 7.0μm, 10.0μm particles; optional 0.3, 0.5, 1.0, 3.0, 5.0, 10μm, 15μm, 20μm, eight-speed particle size count simultaneously.
Test range: 1 to 1 million (corresponding to ISO 4 to 9);
Repeatability: relative standard deviation ≤ 10%;
Particle size accuracy: relative error ≤ 10%;
Light source: a laser diode is used as a light source of the sensor;
Flow rate: 2.83 liters/min (0.1 cfm) (error ≤ ± 5%); 28.3 liters/min (1 cfm) (error ≤ ± 5%); 50 liters/min (1.77 cfm) (error ≤ ± 5%); l / min (3.54cfm) (error ≤ ± 5%);
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