268 • Description
EAGLE 2 Operator’s Manual
Appendix P: Internal Dilution Models
This appendix describes versions of the EAGLE 2 that contain an internal dilution fitting.
Description
Internal dilution versions of the EAGLE 2 have a 1:1 dilution fitting installed in the
bottom case. The dilution fitting blends ambient air into the incoming sample to provide
sufficient oxygen for the catalytic LEL sensor to function properly. The flow system is
arranged to allow the LEL sensor to see diluted sample while all other installed sensors
see normal, undiluted sample.
A vent is installed on the right side of the bottom case when viewing the instrument from
the front. This equalizes the pressure inside the EAGLE 2 as the instrument draws air from
inside the case through the dilution fitting’s hole.
The flow diagram for the internal dilution version is shown below. Depending on your
particular version, you may not have all of the sensor shown below. Any unused sensors
are replaced with a dummy sensor.
Calibration
The instrument must be calibrated with a sample bag. See “Appendix A: Calibrating with
a Sample Bag” for instructions.
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