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8012428/YWL2/3-0/2016-08| SICKO P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER T
Subject to change without notice
2 PRODUCT DESCRIPTION
Dust concentration:
Based on the Beer-Lambert law, the dust concentration is derived from the extinction as
follows:
Extinction is directly proportional to dust concentration for constant particle size and
uniform dust distribution.
Particle size, dust density and dust distribution during differing load states influence trans-
mission and extinction values and therefore the measuring system must be calibrated
using a gravimetric comparison measurement for exact dust concentration measurement.
The calibration coefficient determined can be entered directly in the measuring system as
c = cc2
· E² + cc1 · E + cc0
(Entry see “Calibration for dust concentration measurement”, page 80; standard factory
setting: cc2 = 0, cc1 = 1, cc0 = 0).
2.1.2 Response time
The response time is the time required to attain 90% of the signal peak after a sudden
change in the measurement signal. It can be set anywhere between 1 and 600 s. As the
response time increases, transient measured value fluctuations and interruptions are
damped stronger and stronger which “smoothes out” the output signal.
Fig. 2: Response time
c
231, E•
kL•
---------------------
KE•==
k= extinction constant
L = 2x active measuring path (due to double beam path)
100
98
96
94
92
90
88
86
84
Response time
t in s
Measured value with response time
90% of the signal peak
Process change
0 10 20 30 40 50 60 70 80 90
Measured value
in %
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