ToxiRAE Pro CO
2
User’s Guide
46
1.
At the Calibration screen, press [Y/+].
2.
“Zero Calib” is highlighted. Make sure the ToxiRAE Pro CO
2
is zeroed in
nitrogen.
3.
Press [Y/+]. The message “Apply zero gas…” is displayed.
4.
Start the flow of the zero gas (if used) and press [Y/+] to start the zero calibration.
5.
There is a 60-second countdown, during which time the screen shows the word
“Zeroing…” and the countdown.
6.
Upon completion, it says “Zeroing is done! Reading = 0.0ppm” along with the
reading (it should be 0.0 ppm or very close to it).
7.
“Span Calib” is highlighted.
Note:
You can abort the zero calibration during its countdown by pressing the [MODE] key.
Important!
You must remove the Calibration Adapter from the ToxiRAE Pro CO
2
. If the
Calibration Adapter is attached during normal operation, inconsistent and lower-than-
normal readings will occur because of decreased concentration of the gas being
monitored.
13.4. Span Calibration
This procedure determines the second point of the sensor calibration curve for the sensor.
You must use 5000 ppm CO
2
to calibrate the sensor.
To begin calibration, connect the calibration gas cylinder, flow regulator, and calibration
adapter to the ToxiRAE Pro CO
2
.
With the ToxiRAE Pro CO
2
in Programming Mode, and with Span Calib highlighted,
follow this procedure:
1.
Press [Y/+]. The screen displays the current (or default) calibration gas and its
concentration. For example:
Cal. Gas: CO2
Span=5000ppm
Change?
•
Press [MODE] if you do not want to change it.
•
Press [Y/+] if you want to change it.
If you entered the Calibration Menu without supplying the correct password, or
supplied the correct password but chose not to change the Cal.Gas, you will see a
message like this:
Cal.Gas: CO2
Span=5000ppm
Apply gas…
2.
Press [Y/+] to start calibration.
