T2A Transmitter • 37
f. Allow the gas to flow for 1 minute.
g. Press the ADD button to select “Yes” and continue to Step 5.
5. The unit will automatically begin the 6-second zero process. During the zero, the display
will show a countdown of the time remaining until the process is complete.
NOTE:
The zero process cannot be stopped without disconnecting the power from the unit.
6. When the zero process is complete, press the MENU button to advance to the calibration
screen.
7. If a zero air calibration cylinder was used, turn the regulator knob clockwise to close the
regulator.
Calibrating the Sensor (Manual Cal)
Either the Manual Cal screen or the Auto Cal screen appear, depending on how Calibration
Method is set in the Product Settings and Configuration Menu (see page 26).
NOTE:
HCl - It is recommended that HCl versions only be calibrated using Auto Cal but they
can be calibrated using Manual Cal, if desired.
O
2
- If calibrating with 100% N
2
, you must use Manual Cal. To calibrate using Auto
Cal, a gas concentration between 10 and 18% O
2
is recommended.
You should ONLY calibrate the sensor after completing the zero process.
1. If you are calibrating with HCl calibration gas, connect the tubing to the regulator, turn the
regulator on, and allow gas to flow for 10 minutes before proceeding.
2. If you followed the instructions in Zeroing the Sensor (20.9% for O
2
), the screen below is
displayed.
If you are accessing Manual Cal from Normal Operating Mode, press MENU twice.
3. Unscrew and remove the rain guard from the assembly.
4. Install the calibration cup to the T2A’s sensor housing.
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