Product description
MCS100E Operating Instructions 8009504/VYWA7/V3-1/2018-01 © SICK AG
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2.7
QAL3 (DIN EN 14181)
2.7.1
Evaluation of zero and reference point data
In regular intervals – at the latest within the maintenance intervals as specified in the
aptitude test - an internal readjustment of the measuring device is performed either
automatically or manually at certain
time intervals by either automatic or manual sampling of reference gases for zero point and
reference
point. As an option, the readjustment of the reference point can be performed by swiveling
in an optical calibration filter (
If the limit for readjustment is reached (usually a deviation > 6% off the
preceding calibration), an error is indicated.
Zero point
The value for the zero point is determined by sampling zero gas (usually dry instrument air)
and
reading the instrument display resp. determining the corresponding analog signal. In
practice, the
same zero gas that is used for internal readjustment can also be used for this procedure.
Reference point
The value for the reference point is determined by sampling a reference gas of known gas
concentration and reading the instrument display resp. determining the corresponding
analog signal. In practice, the
same reference gas that is used for internal readjustment can also be used for this
procedure.
2.7.2
Use of the calibration filter option
As an option, the MCS100E HW measuring device can be equipped with a third filter wheel
which allows to swivel-in so-called calibration filters (
).
This function can either be started program-controlled or manually using the MCS100E
standard software.
Zero point
As described above
Reference point, conventional method
As described above
Reference point, alternative method with calibration filter
The value for the reference point is determined by sampling zero gas and swiveling-in the
calibration
filters one after the other by selecting the corresponding menu functions. Then the value is
displayed
resp. the corresponding analog signal is given for each component.
The set reference value corresponds to the value of the calibration filter.
The procedure described in the following is TÜV-tested for MCS100E in the
MCS100E HW emission measuring system.
During gas calibration, the last measured deviation of the calibration filter
values is overwritten and set
to zero until the next gas calibration is performed.
