42/24-10 EN Rev. 9 Chapter 8: Gas Analyzer Calibration 8-C-3
Caldos27: Single-Point Calibration with Standard Gas
Single-Point
Calibration with
Standard Gas
For measurement ranges ≥ measurement range class 1 in the Caldos27 analyzer
module, standard gas can be used for single-point calibration. This standard gas
calibration is carried out exclusively as span calibration and causes an amplifi-
cation correction. Safety-related measurements are excluded from this technique.
Depending on the measurement task involved, the zero- and end-points should be
verified periodically (Recommendation: once a year).
Note: Classification of measurement ranges into class 1 and class 2 is specified in
Data Sheet 10/24-1.20 EN.
Measurement Range
for Standard Gas
When the Caldos27 analyzer module is ordered with standard gas calibration, the
factory-set measurement range for the standard gas is 0–60,000 rTC (rTC = relative
thermal conductivity). During basic calibration in the factory one standard gas is
calibrated in this measurement range. Due to sensor tolerances the values of other
standard gases can differ by up to 5 % from this scaling (see following table for
set-points).
N
2
10,000 rTC Ar 7,200 rTC CH
4
14,000 rTC H
2
60,000 rTC Set-points for
Standard Gas
Air 10,070 rTC CO
2
7,500 rTC He 50,000 rTC
Calibration Method Standard gas calibration is fundamentally a substitute gas calibration without zero
calibration (see also “Calibration Methods” section, page 8-A-10). The correction
values are transferred to all the analyzer module’s sample components and meas-
urement ranges.
Calibration Data Calibration data for manual calibration
Calibration method Substitute gas calibration
Zero component Standard gas
1)
Span component Standard gas
Test gas concentration Value depending on standard gas
3)
Calibration data for automatic calibration
Calibration method Substitute gas calibration
2)
Single zero calibration never
Single span calibration always
Common zero and span calibration never
Test gas concentration Value depending on standard gas
3)
1) Though standard gas calibration is carried out exclusively as span calibration,
standard gas must also be chosen as zero component.
2) Settings of sample components and measurement ranges for zero and span
calibration are taken over from the calibration data for manual calibration.
3) See table “Set-points for Standard Gas”
Manual Calibration Manual standard gas calibration must be carried out exclusively as span
calibration (see also “Analyzer Module Manual Calibration” section, page 8-D-1).
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