EAGLE 2 Operator’s Manual
Maintenance • 235
If the infrared hydrocarbon channel cannot be adjusted to the proper value, a screen
displays that indicates a calibration failure and indicates that the infrared hydrocarbon
sensor failed to calibrate.
The buzzer and alarm LEDs activate in a double pulsing pattern. Press and release the
POWER ENTER RESET button to reset the alarm and continue to the Calibration
Mode Screen. Attempt to calibrate the infrared hydrocarbon channel again. If the
failure continues, investigate the cause. See “Troubleshooting” on page 67.
37. Disconnect the tubing from the probe.
38. Unscrew the demand flow regulator from the calibration cylinder.
39. Use the RANGE
▼
SHIFT button to place the cursor next to the
NORMAL
OPERATION
menu option, then press and release the POWER ENTER RESET
button to return to Measuring Mode.
Maintenance
This section includes a procedure to replace an infrared hydrocarbon sensor.
Replacing the IR Hydrocarbon Sensor
1. Verify that the EAGLE 2 is off.
2. Place the EAGLE 2 upside down on a flat surface or hold it upside down.
3. Unscrew the three case screws until they disengage from the top case. They are
captive screws so they will not fall off of the bottom case.
4. Turn the EAGLE 2 right side up and carefully lift the top case away from the bottom
case. Be careful not to lift it so far that it pulls on the main PCB with the cable that
connects the top case to the main PCB.
5. Lay the top case down next to the bottom case to allow access to the flow system.
6. Locate the infrared hydrocarbon sensor. It has a twelve wire cable with a connector
that mates to an infrared sub PCB that is installed on the main PCB and is normally
located next to the pump. Figure 43 on page 227 shows an infrared hydrocarbon
sensor in a typical location.
7. Unscrew and remove the two screws that hold down the infrared hydrocarbon sensor
bracket.
8. Grasp the sensor firmly and pull it out of the infrared hydrocarbon flow chamber.
Rock it back and forth gently if necessary to pull it out. Take care not to pull the cable
from the sub PCB.
9. Rotate the locking lever counterclockwise on the cable connector that mates to the
infrared hydrocarbon sensor to unlock it.
10. Unplug the old infrared hydrocarbon sensor from the cable.
FAILED SENSOR
ENTER TO CONTINUE
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