RKI Instruments EAGLE 2 Manual - Manual (Page 90)

80 • Checking the Combustible Gas Sensor’s ConditionEAGLE 2 Operator’s Manual
the flow chamber and push it in until it bottoms out.
9. Insert the charcoal filter endcap into the end of the charcoal filter and
push it in until it bottoms out.
10. 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, then it may be damaged when the top case is re-installed.
11. 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.
12. Turn the EAGLE 2 upside down and tighten the three case screws to
secure the top case to the bottom case.
Checking the Combustible Gas
Sensor’s Condition
If you suspect that the combustible sensor has been contaminated or may be
reaching the end of its operational life, do the following to confirm it is still
operating properly:
1. Perform a calibration using single calibration as described in “Calibrating
Using the Single Calibration Method” on page 64.
2. When you perform the span adjustment, note the adjustment range on the
result screen as described in Step 12 and Step on page 68.
3. A new sensor can typically be adjusted to more than twice the calibration
gas concentration. If the result screen indicates that the EAGLE 2 could
not adjust the combustible gas reading to be at least 10% higher than the
calibration gas concentration, then the sensor should be replaced as soon
as possible.
Replacing a 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.