Technology for dust concentration measurement for the dust loadings found after Electrostatic Precipitators or in large stacks

An LED source shines light through the particulate in a stack and the variation in the amount of transmitted light is measured by a receiver mounted on the opposite side of the stack. The variation derives from temporal distributions of particulate which attenuates the light beam. The instrument calculates the dynamic response (ratio of light variation to light intensity) which, for appropriate applications, is proportional to dust concentration and can be calculated in mg/m³ by reference to an iso-kinetic or gravimetric test.

• Compared to Opacity systems, DynamicOpacity™ systems are far less susceptible to errors caused by lens contamination. In practice, this means they need far less instrument maintenance and smaller air purging systems.
• Due to its ratiometric algorithm, DynamicOpacity™ is much less subject to misalignment.
• Compared to other ratiometric opacity systems, the instruments use an optimised frequency bandwidth which improves the quality of the dust measurement to be accurate enough to pass TUV and MCERTS approvals.

PCME DynamicOpacity™ instruments are available with a full range of quality assurance features and options, some of which are unique and patented to PCME Ltd:

• Automatic electronic Opacity zero and span checks performed by varying the light intensity in the transmitter head.
• Automatic electronic DynamicOpacity™ zero and span checks, to test scintillation count at zero and full scale.
• Optional hand held external Electronic Audit Unit for zero and linearity checks
• Comms check, to test control unit correctly communicating with and reading dynamic opacity readings from the sensor(s).