Eagle Instruction Manual Appendix C: Non-Standard Toxic Gas Sensors • 58
menu.
10. Press the SHIFT/▼ button to place the prompt next to the
NORMAL OPERATION menu option, then press the POWER/
ENTER button to return to the normal screen.
NOTE: If a non-standard toxics channel displays Zero Fail after the
Demand Zero procedure, adjust the ZERO control (next to
SPAN) until the reading displays the smallest increment
above 0.0. For example, 0.01 or 0.1. Repeat Demand Zero.
Replacing Non-Standard Toxic Gas Sensors
Replace the non-standard toxic gas sensor when:
• The toxic gas channel cannot be calibrated correctly.
• The toxic gas reading cannot be set to zero by the Demand Zero
command or zero potentiometer.
NOTE: RKI Instruments, Inc. recommends that you return the Eagle
for replacement of the non-standard toxic gas sensor. The
following procedure is provided to allow you to replace the
sensor if necessary.
1. Take the Eagle to a non-hazardous location, and turn the power
off.
2. Unscrew the two large screws on the top of the case, then carefully
lift the top of the case and lay it aside.
3. In the front half of the bottom case, locate the sensor you want to
replace. The sensor with wires connected to EC3 on the analog
PCB displays its reading on the third line of the screen. The sensor
connected to EC4 on the analog PCB displays its reading on the
fourth line of the screen.
4. Remove the two screws at the base of the bracket.
5. Lift the sensor assembly up enough to remove the flow adapter
(two screws). The flow adapter is attached to the sensor.
CAUTION:Avoid pulling on sensor wires. Always unplug at the connector.
6. Disconnect the connector from the analog PCB. Note to which
socket (EC3 or EC4) the connector is connected.
7. Remove the sensor assembly from the instrument case.
8. Remove the two screws that secure the sensor assembly to the
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