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AO2000
CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Pressure in the sample gas path in normal operation p
e
≤
100 hPa; in the
event of faults in the sample gas supply, the pressure may not exceed the
maximum value of p
e
= 500 hPa.
A housing purge with nitrogen must be provided for the measurement of
flammable gases and vapors. Flame barriers can be used as an option (with
the exception of the 'Safety Concept' version (see page 20)). Pressure drop
at the flame barriers approx. 40 hPa with a sample gas flow rate of 50 l/h.
Material of the flame barriers: Stainless steel 1.4571.
Prior to using the analyzer module, the corrosion resistance of the sample
gas must be tested.
Test gases
Zero-point calibration
Oxygen-free process gas or nitrogen
End-point calibration
Process gas with a known oxygen concentration or a substitute gas, e.g.
dried air
Magnos28 with a suppressed measuring range
Test gas with an oxygen concentration in the selected measuring range
Magnos28 with single-point calibration
Test gas with an oxygen concentration in an existing measuring range or
nitrogen or ambient air. Same moisture content as process gas.
ATTENTION
In order to avoid accumulations of explosive gas mixtures, do not use air
as a test gas for single-point calibration when measuring flammable gas-
es!
Dew point
The dew point of the test gases must be approximately the same as the dew
point of the sample gas.
NOTE
The notes for calibrating (see page 255) must be considered.
Pressure sensor
The pressure sensor is installed in the gas analyzer as an option. It is con-
nected to a connection port via an FPM tube.
With measurements in suppressed measuring ranges the connection of the
pressure sensor and the sample gas outlet are to be connected to each oth-
er via a T-joint and short lines.
Particular care should be taken that the gas discharge line is as short as
possible or – in the case of a greater length – has a sufficiently wide inside
diameter (at least 10 mm).
Gas connections
see section "Magnos28: Gas connections" (see page 89)
