RKI Instruments Inert Gas Testing Eagle with Two Pumps - Manual (Page 59)

Eagle Instruction Manual Maintenance • 53
CAUTION: Verify that you install the H
2
S sensor in the appropriate flow
block position. The Eagle will display inaccurate H
2
S readings if
the sensor is not installed in the correct flow block position.
The Eagle continues to display H
2
S readings in the same
channel as it did previously regardless of which socket (EC1 or
EC2) the sensor is wired to or into which flow block position the
sensor is installed. However, the H
2
S reading will be inaccurate
due to the charcoal filter installed before the CO flow block
position.
Replacing the CO Sensor
Replace the CO sensor when:
• The CO channel cannot be calibrated correctly.
• The CO reading cannot be set to 0 by the Demand Zero command.
NOTE: RKI Instruments, Inc. recommends that you return the Eagle
for replacement of the H
2
compensated CO sensor. The
following procedure is provided to allow you to replace the
sensor if necessary.
To replace the CO 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. In the front half of the bottom case, locate the H
2
compensated CO
sensor.
4. Disconnect the sensor amplifier plug from the analog PCB. Avoid
pulling on the wires.
5. Remove the two screws at the base of the sensor flow block.
6. Disconnect the two brass barb fittings from the flow block.
7. Lift the sensor assembly up enough to remove the two screws that
connect the amplifier to the flow block. Be careful not to lose the
screws or the plastic washers that go with them.
8. Remove the CO sensor from the amplifier board by pulling them
apart.
9. Before installing the new sensor, remove the jumper from the