Long-term gas contaminant monitoring - by measuring reaction partner volume change from pressure change, using e.g. piezoceramic converter

摘要

Method for long term monitoring of gaseous or contaminant emissions esp. in air, involves quantitiative evaluation of the chemical reaction involving the contaminant gas as one reaction partner and a solid as another. These enable continuous monitoring independent of visual observation. The volume change brought about in the auxiliary reaction partner by the contaminant gas gives rise to a pressure change which is measured electrically. The pressure change is measured from a resistance change of graphite particles or by a piezoceramic or semiconductor pressure sensor. The reaction chamber is protected from components tending to hinder the reaction by filters. The reaction chamber has gas inlet and exhaust openings with a pressure measurement system at the end remote from the inlet.