38 • T2A Transmitter
5. Screw the regulator into the calibration cylinder.
6. Use the sample tubing to connect the regulator to the calibration cup.
7. Turn the regulator knob counterclockwise to open the regulator.
8. After 20-30 seconds, start using the ADD and SUB buttons to adjust the reading to match
the concentration listed on the calibration cylinder.
9. For all calibration gases except Cl
2
, ClO
2
, and HCl: Let the gas flow for 1 minute.
For Cl
2
and ClO
2
calibration gas: Let the gas flow for 6 minutes.
For HCl calibration gas: Let the gas flow for 5 minutes.
10. Use the ADD and SUB buttons to finish adjusting 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 2 on page 36.
NOTE:
Even if the reading does not need adjustment to match the calibration cylinder’s
concentration, you must adjust it up and then back down to reset the Cal field in the
Zero/Calibration Timer Information screen.
11. When calibration is complete, remove the calibration cup from the sensor housing and
reinstall the rain guard.
12. Use the MENU button to return to Normal Operating Mode.
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