RKI Instruments EAGLE 2 Manual - Manual (Page 279)

EAGLE 2 Operator’s Manual Calibration • 269
indicating that the unit is measuring in full response mode.
15. Allow 2 minutes for the combustible sensor to stabilize before
monitoring the target gas.
16. Perform a demand zero. See “Performing a Demand Zero” on page 27 for
instructions.
17. Monitor for the target gas.
NOTE: The EAGLE 2 retains the methane elimination mode setting when it
is turned off. The methane elimination mode setting, ENABLED or
DISABLED, will remain in effect until it is changed in Display
Mode. So if methane elimination mode is enabled when you turn off
the EAGLE 2, it will remain enabled when you turn the EAGLE 2
on again.
Calibration
The EAGLE 2 stores calibration data for the instrument both in methane
elimination mode and in full response mode. When using the instrument for
applications where methane elimination mode is used, it is most common to
calibrate to hexane. If you are planning to use the EAGLE 2 in methane
elimination mode, RKI Instruments, Inc. recommends that you setup and
calibrate the instrument to hexane in both full response and methane
elimination mode unless your application requires a different setup and
calibration. See “Configuring the Combustible Gas” on page 108 for
instructions to setup the catalytic combustible channel gas.
CAUTION: The EAGLE 2 catalytic combustible sensor experiences a
significant gas response drop when it is changed from full
response mode to methane elimination mode. The EAGLE 2
must be calibrated in both full response mode and in methane
elimination mode to account for this.
To properly calibrate the instrument, do the following:
1. With the EAGLE 2 catalytic combustible channel set up for hexane,
perform a demand zero and a calibration while in full response. See
“Chapter 4: Calibration Mode” on page 55 for instructions.
2. Enable methane elimination in Display Mode.
3. Allow the unit to stabilize for 2 minutes.
4. Perform a demand zero and a calibration while in methane elimination
mode. See “Chapter 4: Calibration Mode” on page 55 for instructions.