ToxiRAE Pro CO
2
User’s Guide
45
13.3. Zero Calibration
This operation sets the zero point of the sensor calibration curve for clean air. Expose the
ToxiRAE Pro CO
2
to 100% nitrogen.
Note:
You must use the ToxiRAE Pro CO
2
Calibration Adapter.
Turn on the ToxiRAE Pro CO
2
. Once it has been through its startup, enter Programming
Mode:
1. Press and hold [MODE] and [Y/+] until you see the Password screen.
2. Input the 4-digit password:
•
Press [Y/+] repeatedly to select a desired number. Numbers increase from 0 to
9. Once 9 is reached, pressing [Y/+] again “wraps” around back to 0.
•
Step from digit to digit using [MODE].
•
When you are done, press [MODE] until OK or Cancel is highlighted.
•
Press [Y/+] to register the password (if OK is highlighted) or to exit without
entering the password (if Cancel is selected).
If you make a mistake, you can cycle through the digits by pressing [MODE] and
then using [Y/+] to change the number in each position.
Note:
The default password is 0000.
If you do not know the password, do not enter anything. Just press [MODE]
repeatedly to highlight OK, and then press [Y/+].
Note:
If the ToxiRAE Pro CO
2
is in Programming Mode and you do not press a key
within 60 seconds, it exits Programming Mode and re-enters Normal Mode.
