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Test Gases
Test Gases
Note
Connection Diagram
Figure A-3-1
Connection Diagram
42/24-10 EN Rev. 9
Reference point
Clean ambient air; its oxygen concentration is established
(= electrical zero):
from the value for dry air and the factor for consideration of
the water vapor content
Example:
Water vapor content at 25 °C and 50 % relative humidity
= 1.56 % Vol. O
O
concentration = 20.93 % Vol. O
2
End-point:
Test gas with oxygen concentration in the smallest measuring
range (e.g. 2 ppm O
The pressure conditions at reference point and end point must be identical!
1 Sample gas inlet (3 mm Swagelok
2 Sample gas outlet (1/8 NPT female thread for
commercially available adapter, e.g. Swagelok
Appendix 3: ZO23 Trace Oxygen Analyzer Module
⇒ Factor = (100 % – 1.56 %) / 100 % = 0.984
2
× 0.984 = 20.6 % Vol. O
2
in N
)
2
2
8
2
1
®
)
7 Housing purge gas inlet
8 Housing purge gas outlet
®
)
1) only in IP54 version
2
7
1)
1)
A-3-3
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