45
..Sensor Adjustment…
O2 20.9%
6.2 Sensor Verification Procedure, O
2
CAUTION:
Be sure to observe all safety guidelines when generating and using
nitrogen.
Under ambient non-oxygen deficient environments,
Dual O2/CO2
monitor will indicate a
display reading of 20.9%. As the sensor ages, the reading may decrease in value. The
following procedure should be used to adjust the reading to 20.9%.
1) Ensure that the
Dual O2/CO2
monitor is in a clean non-oxygen
deficient environment.
2)
Enter the password.
Refer to Section 5.3
3) Select the
Sensor Adjust
menu.
This menu will permit fine-tuning of the oxygen readout to a known concentration of
oxygen. It is recommended to adjust the oxygen display to ambient oxygen levels of
20.9%. To access this menu push the joystick down to display the
Sensor Adjustment
menu. This will scroll on the digital display.
NOTE
:
It is recommended to warm up the Dual O2/CO2 monitor for two hours
before making any adjustments to the sensor.
Push the joystick right to access the first sub menu;
Set Sensor Span
will scroll on the
display. This is the menu that will permit fine adjustment of the ambient oxygen
reading to 20.9%.
Push the joystick right to access the sensor span. The display will indicate a value
between 0 and 255 counts. Pushing the joystick up increases the counts and decreases
the percent oxygen value displayed on the Dual O2/CO2. Pushing the joystick down
decreases the counts and increases the oxygen value displayed on the Dual O2/CO2.
As the counts increase and decrease the percent oxygen displayed will also increase
and decrease. Adjust the digital display until 20.9% +/- 0.2% is displayed.
..Set Sensor Span..
O2 20.9%