Technology

The model P-5CU mass concentration monitor is an optical device utilizing an LED light source with typical lifrtimes well in excess of 100,000 hours.
The emitted beam passed through a sampling volume, optically defined and external to the instrument probe, where particulate matter causes incident light scattering backscatted light is then focused onto a detector and converted into an dlectriaal output.

¹ Shofner, F.M., Kreikbaum, G., and Schmitt, H. W., "In Situ, Measurements of Particulate MassConcentration", presented at the 68th Annual Meeting and exhibition, Air Pollution Control Association, Boston,Massachusetts, June 1975.