RKI Instruments Eagle Series - Manual (Page 71)

Eagle Instruction Manual Appendix D: Carbon Dioxide Sensors • 64
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 33).
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 - 60% 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.
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 - 60.0% OFF OFF OFF OFF