354 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Uras26: Operating specifications
Linearity deviation ≤ 1 % of span
Repeatability ≤ 0.5 % of span
Zero drift ≤ 1 % span per week; for ranges smaller than Class 1 to Class 2: ≤ 3 % of span
per week
Sensitivity drift ≤ 1 % of the measured value per week
Output fluctuation (2
σ)
≤ 0.2 % of span at electronic T90 time = 5 s (Class 1) or 15 s (Class 2)
Detection limit (4
σ)
≤ 0.4 % of span at electronic T90 time = 5 s (Class 1) or 15 s (Class 2)
Flow influence Flow rate in 20 to 100 l/h: within the detection limit
Associated gas effect /
cross sensitivity
The knowledge of the sample gas composition is necessary for the analyzer
configuration. Selectivity measures to reduce associated gas effect (option-
al): Installation of interference filters or filter cells or internal electronic
cross-sensitivity correction or carrier gas correction for a sample component
by other sample components measured with the Uras26.
Temperature influence At zero point: ≤ 1 % of span per 10 °C, for measurement ranges smaller than
Class 1 to Class 2: ≤ 2 % of span per 10 °C
On sensitivity with temperature compensation: ≤ 3 % of the measured value
per 10 °C
On sensitivity with thermostat effect at 55 °C (Option): ≤ 1 % of the measured
value per 10 °C
Ambient temperature in permissible range:
Air pressure effect At zero point: no influence effect
On Sensitivity by means of an integral pressure sensor: ≤ 0.2 % of the meas-
ured value per 1 % air pressure change
The pressure sensor is located in the sample gas path if hoses are used as
the internal gas lines. An external port is used for the pressure sensor if tub-
ing is used for the internal gas lines. Pressure sensor working range:
p
abs
= 600 to 1250 hPa
Power supply influence 24 V DC ± 5 %: ≤ 0.2 % of span
T
90
time T
90
= 2.5 s for measurement cell length = 200 mm and sample gas flow =
60 l/h without signal damping (low pass filter). Low-pass time constant
adjustable from 0 to 60 s.
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