ToxiRAE Pro User’s Guide
46
1.
At the Calibration screen, press [Y/+].
2.
“Zero Calib” is highlighted. Make sure the ToxiRAE Pro is in clean air.
Otherwise attach a cylinder of zero gas to the Calibration Adapter installed on the
instrument.
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!
If you used the Calibration Adapter and a zero air cylinder, you must remove
the Calibration Adapter from the ToxiRAE Pro. 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.
14.4. Span Calibration
This procedure determines the second point of the sensor calibration curve for the sensor.
To begin calibration, connect the calibration gas cylinder, flow regulator, and calibration
adapter to the ToxiRAE Pro.
With the ToxiRAE Pro 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: CO
Span=50ppm
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: CO
Span=50ppm
Apply gas…
2.
Press [Y/+] to start calibration.
