SICK DUSTHUNTER SB30, Руководство по эксплуатации, Страница: 12 / 72

12 8026957/AE00/V1-0/2021-08| SICK O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER SB30
Subject to change without notice
2
PRODUCT DESCRIPTION
2.1.3 Function check
The measuring system has an integrated function check with selectable interval times
allowing an automatic check for correct function (necessary settings
see “Factory
settings”, page 43 ). Any unallowed deviations from normal behavior that may occur are
signaled as errors.
The function check can also be triggered manually by switching the supply voltage off and
on again.
The function check comprises:
●
Approx. 30 s measurement of zero and control value
●
Output of values determined every 90 s (standard value)
Fig. 3: Function check output on a plotter
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). A warning 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 determination.
The light intensity received is compared against the standard value (70%). The measuring
system generates an error signal for deviations greater than ±2%. The error message is
cleared again when the next function check runs successfully. The control value is
determined with high precision through statistical evaluation of a high number of intensity
changes.
The value calculated theoretically (70%) is output for very low dust concentrations
(< approx. 1 mg/m³).
Further information

Service Manual
Zero value output (Live Zero)
Control value output
(70% value, span)
Function check
end
Paper feed
Control value
determination
Function check
start
●
The analog output must be activated to output control values on the analog output
(
see “Factory settings”, page 43 ).
●
The value measured last is output on the analog output during control value determi-
nation.
●
If the control values are not output on the analog output, the current measured value
is output when control value determination has completed.
●
A function check is not started automatically when the measuring system is in “Main-
tenance” mode.