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8011952/YWL2/3-0/2016-08| SICK
O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER C200
Subject to change without notice
PRODUCT DESCRIPTION
2
Determining the dust concentration
Measured scattered light intensity (SI) is proportional to dust concentration (c). Scattered
light intensity not only depends on the number and size of particles but also on the optical
characteristics of the particles and therefore the measuring system must be calibrated
using a gravimetric comparison measurement for exact dust concentration measurement.
The calibration coefficients determined can be entered directly in the measuring system as
c = cc2
·
SI² + cc1
·
SI + cc0
see “Calibration for dust concentration measurement”, page 76
; 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
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 %
