Filter Weighing Method is the only standard method of dust concentration monitoring adopted by the national environment protection authorities. Its principle is to acquire a small sample of smoke from the chimney or exhaust funnel, then the smoke and dust is captured and collected for quantitative analysis to obtain emission concentration value smoke and dust. It is a direct measurement method.
 

Weighing Method is a direct dust concentration measurement method. According to its definition, the dust concentration is obtained by dividing the weight of dust trapped on the filter membrane by the volume of gas flowing through in the same time. Except for weighing method, all other dust concentration measurement methods are indirect. Though the weighing method reflects the definition of dust concentration, its operation is offline and discontinued, and repeated manual operation also generates errors. The Micro-charge Dust Detector can continuously and automatically detect the dust flow rate and concentration in a real- time and online manner. It does not need filter membrane and other consumables, and it only needs very simple maintenance.