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Eagle Instruction Manual Appendix D: Carbon Dioxide Sensors • 59
Appendix D: Carbon Dioxide Sensors
Appendix D describes the Eagle’s non-standard, infrared carbon
dioxide (CO
2
) sensors. It also offers additional information for
calibrating and replacing CO
2
sensors.
Specifications
Table 10 lists specifications for the carbon dioxide sensors. The alarm
settings are user-adjustable (see “Updating the Alarm Point Settings”
on page 32.)
Description
The Eagle uses an infrared sensor to detect carbon dioxide. The
carbon dioxide sensor includes a dedicated amplifier with ZERO and
SPAN controls. A bracket secures the sensor/amplifier assembly to
the instrument case. A four-position connector plugs into the EC3
(channel 3) or EC4 (channel 4) socket on the analog PCB.
A carbon dioxide scrubber is mounted to the exterior front of Eagles
that are factory-shipped with carbon dioxide sensors for the ranges 0 -
5,000 ppm, 0 - 10,000 ppm, and 0 - 5%.
NOTE: Eagles with a range of 0 - 20% and 0 - 50% CO
2
do not include
a scrubber since the normal background of CO
2
in air is
negligible when compared to the full scale of these units.
This scrubber is for use when setting the carbon dioxide sensor’s zero
reading only. Replace the scrubber when it turns from white to a violet
color.
CAUTION: Do not connect the probe to the scrubber during normal
operation or when setting the span reading during calibration.
Table 10: Carbon Dioxide Sensor Specifications
Range Alarm 1 Alarm 2 TWA Alarm STEL Alarm
0 - 5000 ppm OFF OFF OFF OFF
0 - 10,000 ppm 5000 ppm OFF 5000 ppm OFF
0 - 5.00% CO2 0.50% CO2 3.00% CO2 0.50% CO2 3.00% CO2
0 - 20.0% OFF OFF OFF OFF
0 - 50.0% OFF OFF OFF OFF