346 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Analyzer modules operating specifications
Note on the metrological data of the analyzer modules
The metrological data for the analyzer modules apply only when operated in
conjunction with the central unit. They have been determined according to
IEC 61207-1: 2010 "Expression of performance of gas analyzers – Part 1: Gen-
eral". They are based on nitrogen as the associated gas. Compliance with
these data when measuring other gas mixtures can only be assured if their
composition is known. The physical detection limit is the lower limit of the
performance characteristics relative to the measuring range span.
Caldos25: Operating specifications
Linearity deviation ≤ 2 % of span
Repeatability ≤ 1 % of span
Zero drift ≤ 1 % of span per week
Sensitivity drift ≤ 1 % of the measured value per week
Output fluctuation (2 σ)
≤ 0.5 % of smallest measurement range span at electronic T90 time = 0 s
Detection limit (4
σ)
≤ 1 % of smallest measurement range span at electronic T90 time = 0 s
Flow influence ≤ 1 to 5 % of span at a flow change of ±10 l/h. At the same sample and test
gas flow rate, the flow influence is automatically compensated.
Associated gas effect Knowledge of the sample gas composition is required for the analyzer con-
figuration. Measurement results can be greatly distorted by interfering
components in complex (non-binary) gas mixtures.
Temperature influence At each point in the measurement range: ≤ 1 % of span per 10 °C, with re-
spect to the temperature during calibration. Thermostat temperature =
60 °C; Ambient temperature in permissible range
Air pressure effect No effect in permissible operating condition range
Power supply influence 24 V DC ± 5 %: ≤ 0.2% of span
Position influence < 1 % of span up to 10° deviation from horizontal orientation
T
90
time T
90
typical = 10 to 20 s; Option: T
90
< 6 s (applies to a gas analyzer with
one analyzer module)
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