RKI Instruments Eagle Series - Manual (Page 73)

Eagle Instruction Manual Appendix D: Carbon Dioxide Sensors • 66
carbon dioxide scrubber, then press the AIR/▲ button to set the
zero reading.
If the carbon dioxide sensor fails when you press the AIR/▲
button, use the zero control (marked F. ZERO) on the amplifier to
adjust the reading to zero.
CAUTION: Do not adjust the coarse zero potentiometer (marked C.ZERO).
4. Remove the tubing from the carbon dioxide scrubber and probe.
5. Put the caps back on the scrubber.
Calibrating Carbon Dioxide Sensors
Recommended calibration frequency for carbon dioxide sensors is
once every 3 months. Enter Calibration mode and calibrate carbon
dioxide sensors as described in the Calibration section of this manual.
Use the Auto Calibration method if a calibration cylinder is available
that includes all target gases for your Eagle. Use the Single Calibration
method if you are using a carbon dioxide calibration cylinder.
NOTE: If you are using the Auto Calibration method, go to the
Calibration Values screen, verify that the carbon dioxide
value matches the concentration of carbon dioxide in the four-
gas calibration cylinder, then proceed with step 2.
1. At the Single Calibration screen, press the SHIFT/▼ button to
scroll down to the carbon dioxide channel, then press the
POWER/ENTER button.
2. Screw the regulator to the appropriate calibration cylinder.
3. Connect the tubing from the regulator to the Eagle’s probe. Allow
1 minute for the reading to stabilize.
4. If necessary, use the AIR/▲ (increase) and SHIFT/▼ (decrease)
buttons to adjust the carbon dioxide reading to match the
concentration listed on the calibration cylinder.
Go to the next section, “Adjusting the sensor potentiometers,” if
you are unable to match the reading to the concentration of the
calibration cylinder.
5. Press the POWER/ENTER button to set the span value. SINGLE
CALIBRATION END displays, then the Single Calibration menu
displays.
6. Disconnect the tubing from the probe, then unscrew the regulator
from the cylinder.