EAGLE 2 Operator’s Manual
Infrared CO
2
Calibration • 203
Performing a Demand Zero for Carbon Dioxide Sensors
When setting the zero reading, the carbon dioxide scrubber mounted to the side of the
EAGLE 2 allows you to eliminate carbon dioxide normally found in fresh air. To perform
a demand zero, do the following:
1. Remove the black caps from the ends of the carbon dioxide scrubber. Be sure to grab
the scrubber by the EAGLE 2 fitting so that the fitting and tubing do not come off.
2. Connect the carbon dioxide scrubber directly to the EAGLE 2’s inlet fitting.
3. Wait one minute for the fresh air sample to flow through the carbon dioxide scrubber,
then press AIR
▲
YES to set the zero reading.
4. Remove the scrubber from the inlet fitting.
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 62 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 55 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 26 on page 213 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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