Introduction: The optical particle counter converts the light scattered by the aerosol particles in the sampled air through the scattering cavity into electrical signals. The amplitude of the electrical pulse is used to reflect the size of the particle, and the count of the electrical pulse is used to determine the particle concentration. What kind of instrument is measured The angle of scattered light has a great influence on the performance of the instrument. The instrument response curve of the near forward scattering instrument is hardly affected by the refractive index, but it cannot change monotonously with the particle size. The response curve of 90° scattering instrument has a good linear relationship, but it is greatly affected by the refractive index of the particles. Taking into account the above factors, the DLJ-06 aerosol particle size analyzer is designed with a 60°scattering light path, so the response curve of the instrument has a good linearity, and at the same time it is not very sensitive to changes in the refractive index of the particles. Aerosol particle size analyzers produced by domestic and foreign factories are generally only suitable for use in purification industrial sites, and the particle size is relatively small. Such an instrument is not suitable for studying aerosol spectra. The instrument suitable for natural atmospheric aerosol research must be multi-channel simultaneous measurement. The instrument developed here consists of two parts: a photoelectric measuring box and a data processing computer. The A/D conversion board converts the voltage signal into a digital quantity for computer processing, and the measurement of the particle spectrum is completely completed by software. The flow rate of the sampled air through the scattering cavity is 300 ml/min. The software divides the particles from 0.3μm to 12μm into 17 channels, and the concentration measurement range can reach 500,000/liter. The instrument uses a light emitting diode as the light source, and the light source can be used up to 20,000 Over hours, the aerosol particle size analyzer also uses an intelligent control system, which can automatically measure atmospheric aerosols in real time. Features: 1.Multi-sampling channel configuration, which can be expanded to 17-50 sampling channels according to user needs; 2.Compared with similar foreign products, OPC-06 has good performance, low price, full functions, and can work in harsh environments. The product quality has reached military standards. 3.The instrument is easy to maintain, has a long service life, and has low operating costs. It does not require personnel to be on duty. It has wireless data transmission and a mobile phone short message reminder to realize remote monitoring of the instrument. Technical Parameters: Concentration range: 0 to 1000 pcs/cm3 Particle size range: 0.3 to 12 μm Particle size channel: 17-50 channels Sampling time: continuous, freely set Sampling flow rate: total flow rate 0.9 L/min Flow accuracy: +/-15% Particle size accuracy: +/-15% Long-term stability: +/-15% Measuring principle: light scattering Analysis cycle: 1 minute to 5 minutes
Introduction: The optical particle counter converts the light scattered by the aerosol particles in the sampled air through the scattering cavity into electrical signals. The amplitude of the electrical pulse is used to reflect the size of the particle, and the count of the electrical pulse is used to determine the particle concentration. What kind of instrument is measured The angle of scattered light has a great influence on the performance of the instrument. The instrument response curve of the near forward scattering instrument is hardly affected by the refractive index, but it cannot change monotonously with the particle size. The response curve of 90° scattering instrument has a good linear relationship, but it is greatly affected by the refractive index of the particles. Taking into account the above factors, the DLJ-06 aerosol particle size analyzer is designed with a 60°scattering light path, so the response curve of the instrument has a good linearity, and at the same time it is not very sensitive to changes in the refractive index of the particles. Aerosol particle size analyzers produced by domestic and foreign factories are generally only suitable for use in purification industrial sites, and the particle size is relatively small. Such an instrument is not suitable for studying aerosol spectra. The instrument suitable for natural atmospheric aerosol research must be multi-channel simultaneous measurement. The instrument developed here consists of two parts: a photoelectric measuring box and a data processing computer. The A/D conversion board converts the voltage signal into a digital quantity for computer processing, and the measurement of the particle spectrum is completely completed by software. The flow rate of the sampled air through the scattering cavity is 300 ml/min. The software divides the particles from 0.3μm to 12μm into 17 channels, and the concentration measurement range can reach 500,000/liter. The instrument uses a light emitting diode as the light source, and the light source can be used up to 20,000 Over hours, the aerosol particle size analyzer also uses an intelligent control system, which can automatically measure atmospheric aerosols in real time.
