The dust concentration is the mass or number of particles containing dust per unit volume of air. Measurement method In order to understand and evaluate the hazards of dust in the workplace air to workers' health, we have studied the effects of improving dustproof technical measures and evaluating dust prevention measures. It is necessary to measure the dust concentration. There are two methods for expressing dust concentration: mass method and quantity method. The mass dust concentration is the mass of dust in a unit volume of air, expressed in mg/m3. The method for expressing the amount of dust concentration is the number of dust particles per unit volume of air, expressed in n/m3. Before the 1960s, the maximum allowable concentration of dust in many countries was expressed by quantitative concentration, and only countries such as China and the Soviet Union used mass concentration. Later, due to the discovery that the progress of silicosis was closely related to the mass concentration of suspended dust, after the 1970s, countries such as the United Kingdom, the United States, and Japan entered the phase of concentration and mass concentration, and countries gradually developed to the mass concentration, for asbestos dust, due to The nature and severity of the hazard are measured in quantitative concentrations. Concentration determination The determination of the mass dust concentration includes: 1. Determination of dust concentration in the workplace: The measurement was performed in order to understand the average concentration of dust in the workplace and the dust concentration at different locations. 2. The operator's personal exposure concentration: In order to understand the average concentration of dust that the production workers contact during the whole working hours, the individual dust sampler is hung on the worker's body near the breathing position, and a continuous dust collection is performed in a work shift. Find the average concentration of dust. 3. Determination of dust concentration in ventilation ducts: In order to obtain the data required to design the dust removal device or to evaluate the effect of the dust removal device, the determination of the dust concentration in the ventilation duct Beijing Heng Aode Instrument Co., Ltd.
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