EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
203
Uras26
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
≤
1 % of span per week
Span drift
≤
1 % of measured value per week
Output signal fluctuation (2
σ)
≤
0.2 % of span at electronic T
90
-time (static/dynamic) = 5/0
sec
Detection limit (4
σ)
≤
0.4 % of span at electronic T
90
-time (static/dynamic) = 5/0
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): incorporation of interference filters or filter cells,
internal electronic cross-sensitivity or carrier gas correction
for one sample component by other sample components
measured with the gas analyzer.
Temperature effect
Ambient temperature in permissible range.
• At zero point:
≤
2 % of span per 10 °C
• On the sensitivity without thermostat effect:
≤
3 % of the measured value per 10 °C;
• On the sensitivity with thermostat effect (optional):
≤
2 % of the measured value per 10 °C
Thermostat temperature = 55 °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. 30 minutes without thermostat; approx. 2 hours with
thermostat
T
90
time
T
90
≤
2.5 sec for sample gas flow = 60 l/h and electronic T
90
time (static/dynamic) = 5/0 sec
