42/24-10 EN Rev. 9 Chapter 7: Gas Analyzer Configuration 7-A-3
Limas11, Uras26: Notes for Changing Measurement Range Limits
Physical
Measurement Range
The Limas11 and Uras26 analyzer modules have one physical measurement range
per sample component. The limits of this measurement range are determined by
the minimum and the maximum value of the product of the gas concentration and
measurement cell length (c · l)
min
or (c · l)
max
.
Measurement Ranges
in a Delivered
Analyzer Module
Up to four measurement ranges – within the limits of the physical measurement
range – can be ordered for each sample component. The maximum ratio of the
spans is 1:20. The measurement ranges can be starting measurement ranges or
suppressed measurement ranges.
Analyzer Module with
Calibration Cells
If a calibration cell is provided for the measurement component, its set point will
always be the upper end of the largest measurement range.
If the new measurement range is smaller than the old measurement range, the
associated calibration cell can still be used.
After Changing
Measurement Range
Limits
It is recommended after changing the measurement range limits
• To verify the end point of the new measurement range,
• To verify the linearity of the new measurement range (see “Limas11, Uras26:
Relinearization” section, page 9-8).
• To measure the associated calibration cell (see “Limas11, Uras26: Measurement
of Calibration Cells” section, page 9-7).
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