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Appendix
Calibration Correction Values for Temperature and Humidity
Oxygen Analyzer calibration should always be performed at the same temperature and humidity
conditions as the gas being measured. Where this is not possible, a calibration correction value
may be required. A common example is a tropical environment where dry breathing gas from a
high-pressure Scuba cylinder will be measured after Analyzer calibration has been performed in
the warm, humid ambient air.
To determine if a calibration correction value is required, you must first know the temperature
and relative humidity of the air in which calibration will be performed. Using the chart below, find
the atmospheric oxygen percent value corresponding to these values. If the oxygen percent
value falls in the shaded portion of the chart, calibrate the Analyzer to the corrected chart value.
OXYGEN COMPENSATION CHART FOR MOISTURE IN THE ATMOSPHERE
ATMOSPHERE OXYGEN PERCENT IN RELATION TO TEMPERATURE AND RELATIVE HUMIDITY
TEMPERATURE (
TEMPERATURE (
RELATIVE HUMIDITY (%)
10
20
30
40
50
60
70
80
90
100
H20 at 100% RH
If the Temperature and Relative Humidity axis meet in the shaded part of the chart, calibrate to the chart O2 level or w ith dry air
to maintain 0.5% O2 accuracy in NITROX.
To use the correction value, follow the standard Calibration in Air procedure with the following
exceptions:
• Make sure Oxygen Sensor port is exposed to the ambient temperature and humidity
corresponding to the correction value.
• Adjust the Calibrate Knob to achieve a Display reading equal to the correction value.
• Once you have calibrated the Analyzer for temperature and humidity using the, your
readings for gas analysis should be correct with no further adjustment.
• Re-calibrate Analyzer for any changes in temperature or humidity of the ambient
environment or the gas being analyzed.
Note that the calibration correction value is never used when the temperature and humidity
conditions of the gas being measured are the same as the conditions during calibration.
NUVAIR
Pro O
Oxygen Analyzer Operation Manual
2
o
F) -->
32
40
o
C) -->
0
4
ATMOSPHERIC OXYGEN PERCENT (% O2)
20.9
20.9
20.9
20.9
20.9
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.7
20.8
20.7
0.6
0.8
Pro O
50
60
70
10
16
21
20.9
20.9
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.8
20.7
20.7
20.8
20.7
20.7
20.6
20.8
20.7
20.6
20.5
20.7
20.7
20.6
20.5
20.7
20.6
20.5
20.4
20.7
20.6
20.5
20.3
20.7
20.6
20.4
20.3
20.6
20.5
20.4
20.2
1.2
1.8
2.5
22
Page
TM
Oxygen Analyzer
2
80
90
100
110
27
32
38
20.8
20.8
20.7
20.7
20.6
20.5
20.6
20.5
20.4
20.5
20.4
20.2
20.4
20.2
20.0
20.3
20.1
19.8
20.2
19.9
19.6
20.1
19.8
19.5
20.0
19.7
19.3
19.9
19.5
19.1
3.4
4.7
6.5
8.6
120
43
49
20.7
20.4
20.2
19.9
19.7
19.5
19.2
19.0
18.7
18.5
11.5
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