ppbRAE 3000 User’s Guide
Zero (Fresh Air) Calibration
This procedure determines the zero point of the sensor calibration
curve. To perform a fresh air calibration, use the calibration adapter to
connect the instrument to a “fresh” air source such as from a cylinder
or Tedlar bag (optional accessory). The “fresh” air is clean, dry air
without organic impurities and an oxygen value of 20.9%. If such an
air cylinder is not available, any clean ambient air without detectable
contaminants or a charcoal filter can be used.
At the Zero Calibration menu, you can proceed to perform a Zero
calibration or bypass Zero calibration and perform a Span calibration.
You may also go back to the initial Calibration menu if you want to
exit calibration.
•
Press [Y/+] to start calibration.
•
Press [MODE] to quit and return to the main calibration
display.
If you have pressed [Y/+] to enter Zero calibration, then you will see
this message:
1.
Turn on your Zero calibration gas.
2.
Press [Y/+] to start calibration.
Note:
At this point, you may press [MODE] if you decide
that you do not want to initiate calibration. This will take you
directly to the Calibration menu, highlighted for Span
calibration.
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