224 • Maintenance
EAGLE 2 Operator’s Manual
Maintenance
This section includes a procedure to replace an infrared methane sensor.
Replacing the IR Methane 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 methane 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 42 on page 215 shows an infrared methane sensor in
a typical location.
7. Unscrew and remove the two screws that hold down the infrared methane sensor
bracket.
8. Grasp the sensor firmly and pull it out of the infrared methane 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 methane sensor to unlock it.
10. Unplug the old infrared methane sensor from the cable.
11. Connect the new infrared methane sensor to the sensor cable and rotate the locking
lever clockwise to lock the connector.
12. Insert the sensor into the infrared methane flow chamber and push it in until it
bottoms out.
13. Line up the holes in the infrared methane sensor bracket with the two standoffs on the
infrared methane chamber.
14. Install the two sensor bracket screws.
15. Confirm that the main PCB is seated in its slots and that its bottom edge is resting on
the bottom of the bottom case. If the main PCB is not seated properly, it may be
damaged when the top case is re-installed.
16. Make sure that the top case gasket is fully seated in its groove and carefully put the
top case back on the bottom case. If you have any difficulty mating the top and
bottom cases, inspect the placement of the main PCB and the placement of the top
case gasket.
17. Turn the EAGLE 2 upside down and tighten the three case screws to secure the top
case to the bottom case.
18. Calibrate the infrared methane channel as described in “Infrared Methane
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