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Tribo-electric

The principle of tribo-electric dust measurement is that whenever a dust particle hits an electrically loaded metal stick, which has been placed across a flue gas duct, the charge of the metal stick is changed. The more dust particles hitting the stick per time unit, the more it influences the metal stick.

The changes in the charging of the metal stick are an expression of the dust concentration of the process. As the dust particles do not have a well-defined density and as their own charging is different from process to process, the tribo-electric dust meters must be calibrated by an accredited test laboratory to relate the relative measurement into mg/m3.
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