206
EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 16 Specification
Magnos28
Stability
The following data only applies if all the influence variables (e.g.
flow, temperature and air pressure) are constant.
Linearity error
≤
0.5 % of the span or 0.005 vol.-% O
2
, the greater value
applies
Repeatability
≤
50 ppm O
2
Zero drift
≤
3 % of span of the smallest measuring range (in accordance
with order) per week, or 0.03 Vol.-% O
2
per week, whichever
value is greater
The value may be elevated during first commissioning or
after a longer service life.
Span drift
•
≤
0.1 vol. % O
2
per week or ≤
1 % of the measured value
per week (not cumulative), whichever is smaller;
•
≤
0.15 % of the measured value per three months or
0.03 vol.-% O
2
per 3 months, the larger value applies
Output signal fluctuation (2
σ)
≤
25 ppm O
2
at electronic T
90
time (static/dynamic) = 3/0 sec
Detection limit (4
σ)
≤
50 ppm O
2
at electronic T
90
time (static/dynamic) =
3/0 sec
Influences
Flow effect
• Sample gas N
2
:
≤
0.1 Vol.-% O
2
in the range 30 to 90 l/h;
• Sample gas air:
≤
0.1 vol.-% O
2
at a flow rate change of 10 l/h
Associated gas effect
Information on the influence of associated gases can be
found in IEC 61207-3:2002 ‘Gas analyzers – Expression of
performance – Part 3: Paramagnetic oxygen analyzers’.
Temperature effect
Average temperature effect in permissible ambient
temperature range:
• at zero point:
≤
0.02 vol. % O
2
per 10 °C
• on the sensitivity
≤
0.3 % of the measured value per 10 °C
• For highly suppressed measuring ranges (when factory
configured):
≤
0.01 vol.-% per 10 °C in the entire measuring range
Thermostat temperature = 60 °C (140 °F)
For highly suppressed measuring ranges
(≥
99 to 100 vol.-% O
2
) and very small measuring ranges
(≤
0 to 1 vol.-% O
2
) greater temperature fluctuations (≥
5 °C)
at the installation site should be avoided.
Air pressure effect
• on sensitivity without pressure correction:
≤
1 % of the measured value per 1 % of air pressure
change
• on sensitivity with pressure correction using integrated
pressure sensor (option):
≤
0.1 % of the measured value per 1 % air pressure
change;
for highly suppressed measurement ranges
≤
0.01 % of measured value per 1 % air pressure change or
≤
0.002 vol. % O
2
per 1 % air pressure change, whichever
is greater.
Position effect
Zero-
point shift ≤
0.05 vol. % O
2
per 1° deviation from
horizontal location.
Position has no effect on the hard-mounted unit.
Dynamic response
Warm-up time
< 5 hours
The value may be elevated during first commissioning or
after a longer service life.
T
90
time
T
90
≤
3 sec at a sample gas flow of 90 l/h and electronic T
90
time (static/dynamic) = 3/0 sec, gas change from nitrogen to
air (applies to a gas analyzer only with Magnos28)
