204 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 16 Specification
Limas23
Stability
The following data only applies if all the influence variables (e.g.
flow, temperature and air pressure) are constant. They relate to
the smallest measurement range.
Linearity error
≤ 1 % of measuring span
Repeatability
≤ 0.5 % of span
Zero drift
• For NO:
≤ 2 % of span per week
• For NO
2
and SO
2
:
≤ 3 ppm per week for measuring ranges ≤ 100 ppm (daily
automatic zero-point check is recommended), ≤ 2.5 % of
span per week for measuring ranges > 100 ppm
Span drift
≤ 1 % of measured value per week
Output signal fluctuation (2 σ)
≤ 0.5 % of span at electronic T
90
-time = 20 sec
Detection limit (4 σ)
≤ 1 % of span at electronic T
90
-time = 20 sec
Influences
Flow effect
Flow rate in the 20 to 100 l/h range:
Within the detection limit
Associated gas effect / Cross-sensitivity
Analyzer calibration should be based on an analysis of the
sample gas. Selectivation measures to reduce the associated
gas effect (options): internal adjustment or internal
electronic cross-sensitivity correction for one sample
component by other sample components measured with the
gas analyzer.
Temperature effect
Ambient temperature in permissible range.
• At zero point:
≤ 1 % of span per 10 °C
• on the sensitivity
≤ 1.5 % of the measured value per 10 °C
Air pressure effect
• at the zero point:
no influence effect
• On sensitivity with pressure correction using an
integrated pressure sensor:
≤ 0.2 % of the measured value per 1 % of air pressure
change
Dynamic response
Warm-up time
Approx. 2 hours
T
90
time
T
90
≤ 3 s at sample gas flow = 60 l/h and electronic
T
90
time = 0 s
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