What is the meaning of Current Carbon if we measure DPM by using Airtec Monitor?
Current carbon is the build up of Carbon Black generated by Diesel fumes during a work shift. Operation of the Airtec is described as follows: Mine air is drawn by a flow controlled diaphragm pump through a particle size selector which only permits the passage of submicron particles. These particles are collected on a filter.
A laser illuminates the filter and the transmittance of the laser beam is measured in real-time by the instrument. As DPM particles accumulate on the filter, the light transmittance decreases. The instrument converts this decrease in transmittance into a real-time concentration of elemental carbon in the air using calibration data obtained by the NIOSH laboratory using the NIOSH 5040 Method.