CODEL
OPS. 141 63
Issue : A
Revision : 1
Date : 14/06/18
Doc i/d : 0118/6
050028
Appendix A - Optical Transmissivity Measurement
& Solid Content
Since the aim of all optical transmissivity measurements is to assess the level of
solids emission, it is important to consider the relationship between various
optical measurements and the particulate content of the gas. It must first be
recognised that the optical methods can only be applied if the particulate size is
small enough for the mass of the solids to be considered as spread evenly over
the cross section of the flue. In general this limits the optical techniques to
particles of 20 micron or less diameter.
Providing the particle size criterion is met, there are certain very specific
relationships between the optical measurements and the particulate
concentration.
Figure 13
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