Servomex DF-310E, Руководство оператора

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User Interface DF-310E 79
8.6.2 Oxygen Calibration
Analyzer calibration checks and adjustments are made from the Oxygen Cal Menu which is
entered from the Setup menu, Figure 36. After accessing the Oxygen Cal Menu, the display will
present Figure 50.
If the system has been previously recalibrated by the user, when the Oxygen Cal selection is
made, an additional line will be added to the menu that states
Reset Orig Span . The section on
Maintenance and Calibration on page 93 provides more information about spanning the analyzer.
Figure 50: Oxygen Calibration Menu
8.6.2.1 Background Gas Correction (Optional)
The optional GSF (Gas Scale Factor) is used to correct for changes in the rate of oxygen
diffusion when background gases other than nitrogen are present in the sample gas. The GSF
menu can be entered through the Set Up Menu, Figure 36, or through the Oxygen Cal Menu,
Figure 50. In many applications, the GSF is not required, i.e., GSF=1.00. However, for some
background gases with significantly different diffusivities compared to nitrogen (such helium,
hydrogen, or C
3
and heavier hydrocarbons), the GSF can be useful. To use GSF, enter the
volumetric percentages of the sample gas as described below. The GSF is automatically
calculated. Alternately, the GSF factor can be entered manually. The software in the Analyzer
supports the following gases in the GSF calculation:
Ammonia
Argon
Butane
Carbon Monoxide
Ethane
Ethylene
Helium
Hexane
Hydrogen
Methane
Nitrogen
Propylene NH
3
Ar
C
4
H
10
CO
C
2
H
6
C
2
H
4
He
C
6
H
14
H
2
CH
4
N
2
C
3
H
6
Table 16: GSF Corrections
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          
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                 
                   
               