ABB EasyLine EL3060 Series User Manual

EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A 79
Caldos25: Notes on calibration
Calibration methods
Automatic calibration: Zero-point/end-point calibration or substitute gas
calibration (set ex works if a substitute gas com-
ponent is installed, cannot be altered).
Manual calibration: Zero-point/end-point calibration (set ex works) or
substitute gas calibration (can be selected if a sub-
stitute gas component is installed)
Substitute gas calibration
If test gases are not available for calibration, e.g. because they cannot be
filled in test gas cylinders or because their components are not compatible
with each other, the analyzer can be set ex works as per the order for cali-
bration with a substitute gas. In addition to the measuring range of the
sample component, a measuring range for the substitute gas component is
installed ex works. This setting is documented in the analyzer data sheet
(see page 33).
The substitute gas calibration is a zero-point/end-point calibration of the
substitute gas component. The zero and end points of measuring range of
the sample component in the analyzer are then corrected by the values de-
termined in this calibration.
NOTE
Substitute gas calibration must always be used to calibrate all (sample gas
and substitute gas) components if the analyzer is set up for substitute gas
calibration. Zero-point/end-point calibration either in the sample compo-
nent or substitute gas measurement ranges leads to erroneous analyzer
calibration.
Associated gas effect
The measurement technique of the Caldos25 analyzer is based on the dif-
fering thermal conductivity of the various gases. Since this measurement
technique is nonselective, the concentration of a sample component can
only be measured exactly in a binary or quasi-binary gas mixture. If addition-
al associated gas components are present in the sample gas, their influence
must be considered in the ex-works initial calibration.
Test gases
Analyzer Test gas for zero-point calibration Test gas for end-point calibration
Caldos25 Sample component-free test gas or
process gas
Test gas or process gas with a known
sample component concentration
near the end point of the measuring
range
Caldos25 with substitute
gas calibration
Sample component-free substitute
gas
Substitute gas with a known sample
component concentration near the
end point of the measuring range
Dew point
The dew point of the test gases must be approximately the same as the dew
point of the sample gas.

ABB EasyLine EL3060 Series Specifications

General

Brand	ABB
Model	EasyLine EL3060 Series
Category	Measuring Instruments
Language	English