Example of test tolerances:
Vapor with 5 vol.% maximum concentration
3 vol.% setting,
at which 15 % Vapor tolerance = 0.45 vol.%
and, for example, 5 % measuring device tolerance =
0.15 vol.%.
Total tolerance limits = (3
±
0.6) vol.% = 2.4 to 3.6 vol.%
With O
2
sample gas:
Shifted by +0.15 = 2.55 to 3.75 vol.%
When measuring in volume percentage and at
atmospheric pressures which deviate from 1013 hPa,
convert to partial pressure: (see also pages 32 and 36).
Concentration =
[% partial pressure]
Example:
Measured value: 4.5 vol.% and
atmospheric pressure: 900 hPa
Concentration = % partial pressure =
After test
●
Switch off Vapor = turn to »0« –
»0« button engaged.
●
Switch off Air and O
2
flow.
Do not use Vapor if the concentration is not within the
tolerances given.
Vapor must be checked by trained service personnel.
25
Care
Checking concentration
4.5
●
900
1013
Measured value [vol.%]
●
atmospheric pressure [hPa]
1013
4.0 % partial pressure
Set vol.%
Increase in vol.% delivered
when O
2
is used
<1.0
+0.05
1.0 to 2.0
+0.10
2.5 to 3.5
+0.15
4.0 to 6.0
+0.20
6.0 to 8.0
+0.25
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