RKI Instruments EAGLE 2 Manual - Manual (Page 274)

264 • Maintenance EAGLE 2 Operator’s Manual
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 41 on page 253
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.
11. Connect the new infrared hydrocarbon sensor to the sensor cable and
rotate the locking lever clockwise to lock the connector.
12. Insert the sensor into the infrared hydrocarbon flow chamber and push it
in until it bottoms out.
13. Line up the holes in the infrared hydrocarbon sensor bracket with the two
standoffs on the infrared hydrocarbon 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.