76 • Checking the Combustible Gas Sensor’s ConditionEAGLE 2 Operator’s Manual
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 62.
2. When you perform the span adjustment, note the adjustment range on the result
screen as described in Step 12 and Step on page 65.
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.
5. Lay the top case down next to the bottom case to allow access to the flow system.
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