EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D 135
Associated gas effect
The Caldos27 analyzer measurement technique is based on the
differing thermal conductivity of various gases.
Since this technique is non-selective, the concentration of a
sample component can be accurately measured only in a binary
or quasi-binary gas mixture.
If other associated gas components are present in the sample
gas their effect on initial factory calibration must be considered.
Test gases – Caldos27
Test gas for zero point calibration and single-point
Test gas for the end-point calibration
Sample component-free test gas or process gas
Test gas or process gas with a known sample component
concentration
with a suppressed
range
Test gas with a sample component concentration near
the starting point of the measuring range
Test gas with a sample component concentration near
the end point of the measuring range
with single-point calibration Test gas with a known and constant rTC value (standard
gas; possibly also dried room air)
—
In addition to the above mentioned test gases for Caldos27, additional test gases are needed to calibrate
Magnos28.
The requirements are provided in the table in Test gases – Magnos28 on page 26.
Same as manual calibration, with the following limitation:
Zero point and single point calibrations are performed
for all sample components simultaneously, since for thid
purpose, only one common digital output can be used for
valve control (unlike with end point calibration) for this
purpose (Automatic calibration: settings on page 119).
This results in limitation
s with regard to the possible test
gases, which in particular depend on the configuration of
the
• Measurement components
• Measuring ranges
• Gas paths (series or isolated)
Depending on these conditions, certain automatic
calibration methods cannot be performed in a practical
sense.
As in the case with manual calibration, a separate end
point gas valve must be available for each sample
component without a single point calibration, which is
controlled via a correspondingly configured digital
output (Automatic calibration: settings on page 119).
Dew point
The dew point of the test gases must be approximately equal to the dew point of the sample gas.
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