MultiExact Gas Analyser
Appendix
A9.8 Performance data: 0-50ppm CH
4
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.
For either nitrogen or helium background gas, transducer to be calibrated
using the chosen background gas.
Display indication
ppm CH
4
Full scale range
0 to 50 ppm CH
4
Analogue output range
User selectable
(minimum difference – 10% of full range)
Resolution
0.01 ppm CH
4
Repeatability
< 0.5 ppm CH
4
Linearity
± 0.5 ppm CH
4
Intrinsic error (accuracy)
± 0.5 ppm CH
4
Drift per week
± 1 ppm ± 2% of reading
Output fluctuation
± 0.5 ppm CH
4
Response time *
< 20 seconds
Flow effect
Flow driven
< 0.5 ppm or 1.5% of reading **
†
Pressure driven
< 0.5 ppm or 1.5% of reading **
‡
Temperature coefficient
± 3% of measurement or 1 ppm per 10 °C
Pressure effects
1.5% of measurement
#
* T
90
at 500 ml min
-1
.
†
For a 200 to 500 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.
#
For a 1% change in pressure.
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