Zo23 - ABB EasyLine EL3000 Operating Instruction

208 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
... 16 Specification

ZO23

The following data is valid under the condition that all
Influencing quantities (for example, flow, temperature and air
pressure) are constant.
Stability
Linearity error
Owing to the measurement principle, zirconium dioxide cells
are base linear.
Repeatability
< 1 % of the measuring span or 100 ppb O
greater
Zero drift
The zero point (reference point) is displayed if ambient air is
present on the sample gas side. The value for air of
20.6 vol.-% O (at 25 °C and 50 % relative humidity) may
2
deviate through aging of the cell.
< 1 % of the measuring range per week or 250 ppb O
whichever is greater
Span drift
Depends on possible interfering components (catalyst
poisons) in the sample gas and the aging of the cell.
For pure gas measurements in N
measuring range per week or 250 ppb O
greater
Output signal fluctuation (2 σ)
< 0.5 % of the measured value or 50 ppb O
greater)
Influences
Flow effect
≤ 300 ppbv O in the range from 5 to 10 l/h
2
Associated gas effect
Inert gases (Ar, CO , N ) have no effect.
2 2
Flammable gases (CO, H
concentrations to the oxygen content:
conversion O < 20 % of the stoichiometric conversion.
2
If higher concentrations of flammable gases are present,
higher O conversions must be expected. The concentration
2
of flammable gases in the sample gas must not exceed
100 ppm.
, whichever is
2
, CO and Ar: < 1 % of the
2 2
, whichever is
2
(whichever is
2
, CH ) in stoichiometric
2 4
Temperature effect
The effect of the ambient temperature in the permissible
range of 5 to 45 °C is < 2 % of the measured value or
50 ppb O
2
whichever value is greater
Air pressure effect
No effect through a change in air pressure; sample gas must
flow out of the outlet without back pressure.
Position effect
No position effect for permanently installed instruments
Dynamic response
Warm-up time
• The operating temperature of the cell is reached after
approx. 15 minutes. Offset calibration with reference gas
,
2
(ambient air) after 2 hours flow.
• The measurement is ready-to-run after valves and lines
have been purged with sample gas. Typical purging time
for valves and lines: approx. 2 to 5 hours.
T time
90
T < 60 sec for the alternation of 2 test gases in the
90
measuring range 10 ppm with a sample gas flow rate = 8 l/h
and electronic T
per 10 °C change in the ambient temperature,
time = 3 sec
90