CODEL
OPS. 141 55
Issue : A
Revision : 1
Date : 14/06/18
Doc i/d : 0118/6
050028
whether the sampled data will be normalised to the other
conditions, they may be taken out of operation by bringing the
measured values to the standard levels, e.g., O
2
standard level
3%, value fixed at 3 %, Pressure standard level 101kPa, value
fixed at 101kPa, Water Vapour standard level DRY, value fixed at
0 %.
While the sampling is being conducted, record the minutes
average and normalised dust value mg/Nm
3
preferably from a
chart recorder, if used, (making sure of course, that the current
output has been correctly configured). If not available, however,
the displayed normalised dust value should be recorded regularly
for comparison.
After the sampling has been conducted, the two results may be compared, and
the dust factor adjusted if necessary, to bring the calibration to that measured
by iso-kinetic sampling.
! Important, take care to compare only like with like with regard to the
normalising data.
Estimate of a Dust Factor
For the EnergyTech 100 Series 101/102 to calculate the dust density from the
opacity data, the Dust Factor needs to be determined by iso-kinetic sampling.
However, if there is a delay before sampling can be conducted, an estimate of
the dust factor may be used.
Estimated Dust Factor = 2500 / pathlength in metres
It must be emphasised that this approximation of the dust factor cannot be
accurate and that it might be as much as a factor of 2 in error, particularly if the
particle size is large.
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