horiba GA-370, Instruction Manual

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2 Preparations
10
2.4.2 Connections
Connect the tubes as shown in the figure below.
Fig. 8 Tube connection diagram
2.4.3 About reference gas
If the reference gas contains impurities (in particular, measurement component gas, moisture,
or large amount of interfering gas), the analyzer specifications cannot be met and correct
measurement becomes impossible.
The following table shows the reference gas properties required for analyzers.
Table 7 Reference gas list (base gas same as sample gas)
If the above level of purity is not possible, provide a commercially available zero gas purifier.
Exhaust outlet
Sample gas /
span gas inlet
Reference gas inlet
Reference gas Sample gas / span gas
Measurement
component
Allowable concentration of impurities (ppb)
H
2
O CO CO
2
CH
4
CO analyzer 5000 10 1000 1000
CO
2
analyzer 5000 1000 10 1000
CH
4
analyzer 5000 1000 1000 10