ABB EasyLine EL3000 Operating Instruction page 132

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