MultiExact Gas Analyser
Appendix
A9.3 Performance data: O
2
trace measurement
☞
The display indication given below is the default indication. You can configure
the analyser to provide other display indications (see Section 5.10).
☞
Performance data has been determined in accordance with EN61207.
Display indication
ppm O
2
Full scale range
0 to 5 ppm O
2
(minimum)
0 to 999,999 ppm O
2
(maximum)
Analogue output range
User selectable (minimum difference – 1 ppm)
Resolution
0.01 ppm O
2
(0 – 10 ppm)
Repeatability
< 0.1 ppm O
2
(0 – 10 ppm)
Linearity
± 0.05 ppm O
2
(0 – 10 ppm)
Intrinsic error (accuracy)
± 0.1 ppm O
2
(0 – 10 ppm)
Zero drift per week
± 0.25 ppm
Span drift per week
± 1% of measurement or 0.25 ppm **
Output fluctuation
± 0.5% of measurement or 10 ppb **
Response time *
10 seconds (for a 2 – 10 ppm change)
Flow effect
Flow driven
± 0.15 ppm or 2% of reading **
†
Pressure driven
± 0.15 ppm or 2% of reading **
‡
Zero temperature coefficient
0.01 ppm per 10 °C
Span temperature coefficient
± 1% of measurement or 0.01 ppm per 10 °C **
Cross sensitivity
Typical effect of < 1 ppm O
2
: 15 ppm H
2
;
100 ppm CH
4
; 80 ppm CO
Pressure effects
None
#
* T
90
at 400 ml min
-1
or 68.9 kPa gauge (7 psig, 0.48 bar gauge) sample gas supply
pressure.
†
For a 200 to 400 ml min
-1
change in sample gas flow rate.
‡
For a 14 to 55 kPa (0.14 to 0.55 bar, 2 to 8 psi) change in sample gas inlet pressure.
#
Assuming that the sample is vented to atmosphere.
** Whichever is the greater.
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