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When using particle counter, the sampling location should be away from pollution sources and ventilation openings.

particle counter principle

A dust particle counter is an instrument used to measure tiny particles (dust or droplets) suspended in the air. These tiny particles are the main source of air pollution, so dust particle counters are widely used in environmental protection, industrial production, dust-free workshops and other fields.
The working principle of dust particle counter is based on the principles of laser scattering and light absorption. When laser light passes through air containing dust, the laser light scatters and absorbs dust particles, causing the light intensity to weaken. By measuring the intensity of light after scattering and absorption, the number and size distribution of dust particles can be deduced.
Generally speaking, a dust particle counter consists of the following parts:

  1. Sampling head: The sampling head is the core component of the dust particle counter. It is responsible for collecting dust particles in the air. The sampling head is usually designed as a slit or small hole to allow airborne particles to pass through and enter the interior of the counter.
  2. Optical system: The optical system includes a laser emitter and a photodetector, which are used to measure the light intensity after scattering and absorption. The laser light emitted by the laser emitter enters the inside of the counter through the sampling head, and is scattered and absorbed when it encounters dust particles. Photodetectors detect the intensity of scattered and absorbed light and convert it into electrical signals.
  3. Data processing system: The data processing system processes the electrical signals output by the photodetector and calculates the number and size distribution of dust particles. It usually includes signal processing circuits, microprocessors, data memories, etc.
  4. Display and control system: The display and control system is used to display measurement results, control the operation of the counter and set parameters, etc. It usually includes elements such as LCD screens, buttons, menus, etc.
    When using a dust particle counter, you need to pay attention to the following points:
  5. Choose a suitable sampling location: The sampling location should be far away from pollution sources and ventilation openings to ensure the accuracy of measurement results.
  6. Regular calibration and maintenance: Dust particle counters require regular calibration and maintenance to ensure the accuracy and stability of measurement results.
  7. Pay attention to data interpretation: The measurement results may include the number of dust particles in different particle size ranges. The data needs to be interpreted correctly so that appropriate measures can be taken to reduce air pollution.

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