26 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 4 Preparation for Installation
… Magnos28
Test gases – Magnos28
Test gas for zero point calibration and single
-point
end-point calibration
Process gas with a known O
2
concentration
with a suppressed measuring
Zero point calibration: pure nitrogen or hydrogen-free
operating gas
Single-point calibration: 100 Vol.-% O
2
or test gas
with O
concentration in the measuring range
2
concentration near the end point of the
measuring range, or pure oxygen
with single-point calibration
2
concentration in an existing measuring
with substitute gas calibration
-free process gas or substitute gas (O
in N
)
example dried air
In addition to the above mentioned test gases for
Magnos28, additional test gases are needed for the calibration of
The requirements are shown in the table in section Test gases – Caldos27 on page 32.
Test gases – Caldos27 on page 32 for instructions on test gases and possible limitations in
Dew point
The dew point of the test gases must be approximately equal to the dew point of the sample gas.
Note
The instructions for calibration must be observed, see Magnos28 – notes for calibration on page 131.
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