Nuvair O2 Quickstick - Appendix: Calibration Correction Values

O
2
Quickstick
TM
Oxygen Analyzer
NUVAIR Page 9
O
2
Quickstick Oxygen Analyzer Operation Manual
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 your temperature and relative humidity. If the oxygen percent value falls in the
shaded portion of the chart, calibrate the Analyzer to the corrected chart value.
To use the correction value, follow the standard Calibration procedure except as follows:
• Make sure Oxygen Sensor is exposed to the ambient temperature and humidity corresponding to the
correction value.
• Adjust the Calibration Adjustment Screw 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.
OXYGEN COMPENSATION CHART FOR MOISTURE IN THE ATMOSPHERE
ATMOSPHERE OXYGEN PERCENT IN RELATION TO TEMPERATURE AND RELATIVE HUMIDITY
TEMPERATURE (
o
F) -->
32 40 50 60 70 80 90 100 110 120
TEMPERATURE (
o
C) -->
0 4 10 16 21 27 32 38 43 49
RELATIVE HUMIDITY (%) ATMOSPHERIC OXYGEN PERCENT (% O2)
10 20.9 20.9 20.9 20.9 20.8 20.8 20.8 20.8 20.7 20.7
20 20.9 20.9 20.8 20.8 20.8 20.8 20.7 20.6 20.5 20.4
30 20.9 20.8 20.8 20.8 20.7 20.7 20.6 20.5 20.4 20.2
40 20.8 20.8 20.8 20.7 20.7 20.6 20.5 20.4 20.2 19.9
50 20.8 20.8 20.8 20.7 20.6 20.5 20.4 20.2 20.0 19.7
60 20.8 20.8 20.7 20.7 20.6 20.5 20.3 20.1 19.8 19.5
70 20.8 20.8 20.7 20.6 20.5 20.4 20.2 19.9 19.6 19.2
80 20.8 20.8 20.7 20.6 20.5 20.3 20.1 19.8 19.5 19.0
90 20.8 20.7 20.7 20.6 20.4 20.3 20.0 19.7 19.3 18.7
100 20.8 20.7 20.6 20.5 20.4 20.2 19.9 19.5 19.1 18.5
H20 at 100% RH 0.6 0.8 1.2 1.8 2.5 3.4 4.7 6.5 8.6 11.5
I f t h e T e m p e r a t u r e a n d R e l a t i v e H u m i d i t y a x i s m e e t i n t h e s h a d e d p a r t o f t h e c h a r t , c a l i b r a t e t o t h e c h a r t O 2 l e v e l o r w i t h d r y a i r
t o m a i n t a i n 0 . 5 % O 2 a c c u r a c y i n N I T R O X .