50 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Shut-off valve in the combustion gas supply line
A shut-off valve must be installed in the combustion gas supply line to in-
crease the safety in the following operating states:
• Shutting down the gas analyzer,
• Failure of the instrument air supply,
• Leakage in the combustion gas feed path inside the gas analyzer.
This shut-off valve should be installed outside the analyzer house in the vi-
cinity of the combustion gas supply (cylinder, line).
ABB recommends the use of a pneumatic shut-off valve which is actuated by
the instrument air. This shut-off valve can be purchased from ABB: Part
number 0769440.
If a pneumatic shut-off valve of this kind cannot be installed, precautionary
measures must be taken, so that the overall status or the "failure" status of
the gas analyzer is monitored (see section "Fidas24: Troubleshooting" (see
page 335)).
Test gases
Zero-point calibration
Quality Nitrogen, Quality 5.0, synthetic air or catalytically cleaned
air with an organic C content < 1 % of span
Inlet pressure p
e
= 1000 ± 100 hPa
Flow 130 to 250 l/h
End-point calibration
Quality Sample component or substitute gas component in ni-
trogen or synthetic air with concentration adjusted to the
measuring range
Inlet pressure p
e
= 1000 ± 100 hPa
Flow 130 to 250 l/h
NOTE
The notes for calibrating (see page 238) must be considered.
Gas connections
see section "Fidas24: Gas connections" (see page 83)
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