9-8
Chapter 9: Inspection and Maintenance
42/24-10 EN Rev. 9
Limas11, Uras26: Relinearization
When should
relinearization be
performed?
Sample component relinearization should be performed
•
If the linearity deviation exceeds the permissible 1% of span
•
If the start of a suppressed measurement range is to be calibrated
•
After a component (lamp / emitter, sample cell, calibration unit / cell, detector) is
installed in or removed from a beam path.
We recommend to perform the relinearization of a sample component after
measurement range limits have been changed (see “Limas11, Uras26: Notes for
Changing Measurement Range Limits” section, page 7-A-3).
Test Gases
Depending on the number and type of measurement ranges, test gases with
varying concentrations are required for relinearization.
Number and Type of Meas. Ranges
Test Gas Concentration
1 Measurement Range
Approx. 40–60% of the measurement
range end value (“center point gas”)
2 Measurement Ranges
End value of smaller measurement range
2 Measurement Ranges,
1 of which is suppressed
Start value of suppressed measurement
range
Menu Path
MENU
→
Maintenance/Test
→
Analyzer spec. adjustm.
→
Relinearization
Step Action
Relinearization is performed separately for each sample
component.
1
Perform the basic calibration for the zero and span of the sample
component to be relinearized (see page 9-30).
2 Select
the
Relinearization
menu item.
3 Select
the
Sample component
.
4
Turn on the test gas supply.
5
Enter the test gas concentration set point value.
6
Wait until the measurement value reading stabilizes and activate the
alignment procedure.
Procedure
7
Repeat steps 3-6 for all sample components.