ABB EasyLine EL3000 - Page 132

132 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 9 Calibration
… Magnos28 – notes for calibration
Test gases – Magnos28
Analyzer
Test gas for zero point calibration and single
-point
calibration
Test gas for the end
-point calibration
Magnos28
Oxygen-free process gas
Process gas with a known O
2
concentration
Magnos28
with a suppressed measuring
range
•
Zero point calibration: pure nitrogen or hydrogen-free
operating gas
•
Single-point calibration: 100 Vol.-% O
2
or test gas
with O
2
concentration in the measuring range
Test gas with O
2
concentration near the end point of the
measuring range, or pure oxygen
Magnos28
with single-point calibration
Test gas with O
2
concentration in an existing measuring
range or ambient air.
—
Magnos28
with substitute gas calibration
Oxygen
-free process gas or substitute gas (O
2
in N
2
)
Substitute gas, for
example dried air
Magnos28 + Caldos27
(manual calibration)
In addition to the above mentioned test gases for Magnos28, additional test gases are need
ed for the calibration of
Caldos27.
The requirements are shown in the table in section Test gases – Caldos27 on page 32.
Magnos28 + Caldos27
(automatic calibration)
See the table in section
Test gases – Caldos27 on page 32 for instructions on test gases and possible limitations in
automatic cali
bration.
Dew point
The dew point of the test gases must be approximately equal to the dew point of the sample gas.