The laser dust particle counter is an instrument used to measure the number and particle size distribution of dust particles in the air, thereby providing a basis for the assessment of air cleanliness. The common laser dust particle counter is the light scattering type (DAPC), which measures the particle size range of 0.1-10 μm. In addition, there is the condensation nucleus type laser dust particle counter (CNC), which can measure smaller dust particles.
The basic principle of the laser dust particle counter is that the detection laser of the optical sensor is scattered by dust particles and is received by the photosensitive element and generates a pulse signal. The pulse signal is output and amplified, and then digital signal processing is performed. Standard particle signals are compared, and the comparison results are expressed using different parameters. The instrument's measurement parameter settings, measurement result display, buttons, timing, printing, time, date, data storage, etc. are all controlled and implemented by the built-in microcomputer (MCU). The instrument can simultaneously display the temperature and humidity of the environment and monitor and report the temperature and humidity of the laser particle sensor. working status.
At present, there are more and more users of laser dust particle counters. Laser dust particle counters are widely used in medicine, electronics, precision machinery, color tube manufacturing, microorganisms and other industries to achieve work with various cleanliness levels. Monitor the purification effect and cleanliness level of the station, purification room, and purification workshop to ensure the quality of the product. The following is how to choose a dust particle counter? Specific questions and factors that should be considered:
1. What type of data are expected to be collected? Will this information be recorded as simple pass/fail? Or will the information be recorded into a spreadsheet or database?
2. What type of environment will the particle counter be used in? Will it be used in an ISO Class 3 clean room for routine particle counting, or will it be used to verify flow critical processes?
3. Will this particle counter be used to certify clean rooms and test from one location to another?
4. Will operators place dust particle counters around them? On the workbench of critical processes, or installed on a movable trolley?
5. Will the dust particle counter be used for continuous dynamic clean room particle monitoring? Will the particle counter be used? Planning to connect to an environmental monitoring system?
6. Sensitivity: The smallest size of particles that can be detected.
7. Counting efficiency: the ratio of measured particle concentration to true particle concentration. Use a more sensitive instrument to measure true particle concentration, with a counting efficiency of 100 at the smallest particle size of the instrument being tested. A properly designed instrument should have a counting efficiency of 50%.
8. Zero count level or false count rate: The number of falsely reported particles using filtered air at optimal flow rate for a given amount of time. This correct report is the number of particles every 5 minutes. (The desired zero count rate should be less than 1 every 5 minutes)
9. Flow rate: This is the amount of air passing through the particle counter. This is usually expressed in cubic feet per minute. Common flow rates are 1.0 cfm and 0.1 cfm. The greater the flow rate, the larger the pump for pumping air, and the larger the particle counter.
10. Channel: This is the number of "bins" that the particles are placed into based on the calculated corresponding size of each particle. Channels are expressed in microns. For example, you might have a 4-channel particle counter. This means particles can be counted and classified in 4 different channels. Examples of channels are: 0.1μm, 0.2μm, 0.3μm, 0.5μm, 1.0μm, 5.0μm...
CW-HPC600amp; CW-HPC600A type handheld laser dust particle counter is an original creation of Shenzhen Sinawe A highly sensitive laser dust particle counter that combines handheld and desktop printing. Its patented design not only leads international similar products in sensitivity, resolution and stability of sensor technology. It also uses a unique multi-functional integrated design to meet and facilitate users' needs.
It can accurately measure the number and distribution of particles in the environment in real time; various measurement parameters can be set, such as automatic real-time display, particle size selection, timing, delay and automatic repeated measurement, time, and date settings, and data storage. And printing, counting over-limit alarm light functions, etc.
CW-HPC600amp; CW-HPC600A handheld particle counter is designed in accordance with the international standard ISO14644-1 and has a Chinese and English bilingual backlight display. The novel FPGA technology ensures that six users can freely set the particle size channel to be measured simultaneously. For the reliability and accuracy of real-time detection, up to 1,000 sets of sampling data can be stored in the built-in flash memory, and high-speed data downloading can be achieved through the USB interface. The instrument has high testing accuracy, stable performance and strong multi-functionality. It is an ideal choice for authoritative inspection agencies such as quality supervision institutes, ultra-large scale integrated circuit ultra-clean workshops (rooms), and manufacturing enterprises in the electronics industry, medical and health care, food processing, optics or precision machinery. It is an ideal instrument for testing purified environments and clean room cleanliness levels in aerospace and other scientific research departments.