228 • Infrared CO
2
Calibration EAGLE 2 Operator’s Manual
5. Put the caps back on the scrubber.
Infrared CO
2
Calibration
An infrared CO
2
channel can be calibrated using the auto calibration method
or the single calibration method. To calibrate an infrared CO
2
channel using
the single calibration method, see “Calibrating Using the Single Calibration
Method” on page 64 and follow the instructions for calibrating a single
channel. If your instrument is a multi-channel instrument that includes one or
more infrared CO
2
channels, RKI Instruments, Inc. recommends using the
auto calibration method for convenience. The calibration instructions below
show a 5 channel instrument which has the four standard channels, LEL/
oxygen/H
2
S/CO, and an infrared CO
2
channel for 0-5 %vol. To use the auto
calibration method to calibrate a multi-channel instrument that includes an
infrared CO
2
channel, do the following:
NOTE: If your instrument has more than one infrared CO
2
sensor, you will
need a calibration cylinder for each sensor.
1. See “Calibration Supplies and Equipment” on page 56 for a description
of the necessary calibration supplies. In addition to an appropriate multi-
gas cylinder that is used to calibrate any active standard channels, you
will also need a cylinder to calibrate the infrared CO
2
channel. See
Table 25 on page 238 for available cylinders. Make sure your calibration
cylinder is appropriate for the infrared CO
2
detection range.
2. Find a fresh-air environment. This is an environment free of toxic or
combustible gases and of normal oxygen content (20.9%).
3. While in Measuring Mode, press and hold the RANGE ▼ SHIFT button,
then press the DISPLAY ADJUST NO button and release both buttons.
4. If the unit prompts you for the password, enter it by using the AIR ▲
YES and RANGE ▼ SHIFT buttons to select each password number and
then pressing and releasing POWER ENTER RESET to enter the number
and move on to the next one.
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