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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
2
Product Description
2.1
Measuring principle, measured variables
2.1.1
Functional principle
The DUSTHUNTER C200 measuring system operates as transmissometer with double
beam path and as scattered light measuring device with forward dispersion.
Fig. 1: Measuring principle with transmission and scattered light measurement with forward
dispersion
2.1.1.1
Transmission measurement
A high performance LED sends light in the visible range (white light, wavelength approx.
450 to 700 nm) through the active measuring path containing particles to the reflector
where it is bounced back to the receiver. A highly sensitive measurement receiver accepts
the signal weakened by particles, amplifies the signal electrically and feeds it to the
measuring channel of a microprocessor as central part of the measuring, control and
evaluation electronics.
Continuous monitoring of the sender output (partial beam to monitor receiver) registers the
smallest changes in brightness of the light beam sent which then serves to determine the
measurement signal.
Measured variables
The measuring system uses transmission (T) as primary optical measured variable. The
other measured variables opacity (O), relative opacity (ROPA), extinction (E) and dust
concentration (c) are derived from this variable.
à
Concave mirror
Reflector
Monitor receiver
Beam splitter
Active measuring volume
Scattered light measurement
Measurement receiver
(4-quadrant element)
Active measuring path
Effective active measuring path
à
LED
Transmission measurement
Scattered light measurement
Scattered light receiver
Laser diode