Eagle Instruction Manual Maintenance • 48
Replacing the oxygen sensor
Replace the oxygen sensor when:
•The O
2
channel cannot be set to 00.0% on an oxygen-free sample.
•The O
2
display cannot be set to 20.9% by the Demand Zero
command.
•The O
2
reading drifts noticeably. For example, if the O
2
reading
varies from 20.5 to 21.5 while you view the display for a few
seconds.
To replace the oxygen sensor:
1. Take the Eagle to a non-hazardous location, and turn the power
off.
2. Unscrew the two large screws on the top of the case, then carefully
lift the top of the case and lay it aside.
3. Locate the oxygen sensor. With the batteries closest to you, the
oxygen sensor is at the bottom left corner of the sensor block.
4. Unplug the cable leading from the oxygen sensor at the large
multi-pin connector.
5. Loosen the screws on the metal strap that covers the oxygen
sensor.
6. Push the strap toward the screw that is furthest away from the
battery compartment.
7. Swing the strap aside.
8. Remove the oxygen sensor.
9. Install the replacement sensor in reverse order.
Replacing the H2S or CO sensor
Replace the H
2
S or CO sensor when:
•The H
2
S or CO channel cannot be calibrated correctly.
•The H
2
S or CO reading cannot be set to 00 by the Demand Zero
command.
NOTE: Allow up to 1/2 hour after you replace the H
2
S or CO sensor,
or if charged batteries have not been installed for an extended
period, for the channel to show a normal response, then
calibrate the sensor.
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