Dust measurements by the gravimetric methods currently used are inherently delayed and are susceptible to tampering and accidental dislodgement of dust. This paper presents a special structure of dust measurement instruments, the light way and design method of electric circuit. Based on scattering and transmission of light principle using infrared, since the principle of instruments is advanced technology and the speed of measurement is fast. The instruments are very fit for fast detect in inflammable and explosive situation and it is also reproducibility, long-term stability and high accuracy instrument of dust measurement.
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