Product Description
DUSTHUNTER T · Operating Instructions · 8012428 V 2.0 · © SICK MAIHAK GmbH Germany 17
Zero value measurement
The sender diode is switched off for zero point control so that no signal is received. This
means possible drifts or zero point deviations are detected reliably in the overall system
(e.g. due to an electronic defect). An error signal is generated when the "zero value" is
outside the specified range.
Control value measurement (Span test)
Sender beam intensity changes between 70 and 100% during control value deter-
mination. The light intensity received is compared against the standard value (70%). The
measuring system generates an error signal for deviations greater than ±2%. The fault
message is cleared again when the next check cycle runs successfully. The control value is
determined with high precision through statistical evaluation of a high number of intensity
changes.
The control value is determined with the control reflector swiveled in on versions with
integrated contamination measurement.
Figure 4 Swivel plate position during control value measurement
Control reflector
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