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EAGLE 2 Operator’s Manual Infrared CO
2
Calibration • 227
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 237 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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