RKI Instruments Eagle 1 Manual - Manual (Page 74)

67 • Appendix D: Carbon Dioxide Sensors Eagle Instruction Manual
7. With the Single Calibration menu displayed, press the SHIFT/▼
button until the prompt is next to the last channel, then press the
SHIFT/▼ button again. The
ESCAPE message displays.
8. Press the POWER/ENTER button to return to the Calibration
menu.
9. Press the SHIFT/▼ button to place the prompt next to the
NORMAL OPERATION menu option, then press the POWER/
ENTER button to return to the normal screen.
Adjusting the Sensor Controls
CAUTION: Only perform the following steps if you are unable to set the
correct calibration reading with the AIR/
▲ and SHIFT/ ▼
buttons.
1. Use the AIR/▲ and SHIFT/▼ buttons to set the reading to the
middle of the range in which you can currently adjust the reading.
For example, if you can set the reading from a minimum of 1.00%
CO
2
to a maximum of 3.00% CO
2
, set the display to 2.00% CO
2
.
2. Unscrew the two large screws on the top of the case, then carefully
lift the top of the case and lay it aside.
3. Locate the carbon dioxide sensor in the front half of the bottom
case. A sensor with wires connected to EC3 on the analog PCB
displays its reading on the third line of the screen. A sensor
connected to EC4 on the analog PCB displays its reading on the
fourth line of the screen.
4. Adjust the carbon dioxide sensor’s SPAN control one turn and
observe the display reading. Continue to adjust the SPAN control
until the display reading matches the concentration of the
calibration cylinder.
The SPAN control is located on the top edge of the amplifier and is
the control closest to the front of the instrument. (The front of the
instrument has the scrubber attached to it.)
5. Press the POWER/ENTER button to set the span value. SINGLE
CALIBRATION END displays, then the Single Calibration menu
displays.
6. Place the top of the case in its original position, then secure it with
the large screws you loosened in step 5.
7. Disconnect the tubing from the probe.
8. Unscrew the regulator from the calibration cylinder.