AirLink 6940XP Operator’s Manual
Sensor Settings and Calibration
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42
5. Press
ADD
again to confirm and advance to the set calibration point screen.
To cancel calibration and return to the Sensor Settings menu, press
SUB
. Pressing
MENU
or
BACK
will also return the instrument to the Sensor Settings menu.
6. Press the
ADD
and
SUB
buttons to adjust the reading on the screen to match the concentration
listed on the calibration cylinder.
For detectors using a surrogate gas, adjust the reading to match the surrogate gas
concentration multiplied by the factor listed in Table 4 on page 41.
NOTE:
For 10.6 eV and 11.7 eV PID sensors, if you are calibrating with a gas other than
isobutylene, you must take the calibration gas’ factor to isobutylene into account
when setting the calibration gas concentration.
7. Press
MENU
to save the gas concentration setting and advance to the calibration start screen.
8. Unscrew and remove the rain guard from the assembly.
9. Install the calibration cup to the AirLink 6940XP’s sensor housing.
10. Use the sample tubing to connect the regulator to the calibration cup.
11. For toxic gas cylinders, like Cl
2
, it is important to vent the regulator while installing it onto the
cylinder. Open the regulator by turning the knob counterclockwise and install it onto the
cylinder.
