RKI Instruments EAGLE 2 Manual - Manual (Page 250)

240 • Start Up and Normal Operation EAGLE 2 Operator’s Manual
other two sensor chamber locations depending on the particular version of the
EAGLE 2. Some infrared methane instrument configurations do not include
the 4-sensor flow chamber.
Infrared Methane Sensor
The infrared methane sensor is a cylindrical sensor with a diffusion opening
on the front and a 12 pin circular connector on the back. A 12 wire cable
plugs into the back of the infrared methane sensor with a circular connector
that includes a locking lever. The other end of the cable plugs into an infrared
sub PCB (see description below) that is installed on the main PCB. The
sensor is held in the infrared flow chamber by a bracket on standoffs.
Infrared Sub PCB
The infrared sub PCB is a circuit board that is installed on the main PCB in
one of the 3 sub PCB positions when an infrared methane sensor is used with
the EAGLE 2. The infrared methane sensor connects to the sub PCB with a
12-position connector. The sub PCB plugs into the main PCB and is held in
place with a screw/flat washer/lock washer. There are no user serviceable
parts on the infrared sub PCB.
Start Up and Normal Operation
For instructions to startup and use an EAGLE 2 that includes an infrared
methane sensor, reference “Start Up” on page 22, “Measuring Mode, Normal
Operation” on page 29, and “Measuring Mode, Alarms” on page 35.
Detection Ranges
The infrared methane sensor can be factory set to detect gas in a 0-100 %LEL
configuration, an autoranging configuration, or a 0 - 100.0 %volume
configuration. The autoranging configuration detects gas on a 0-100 %LEL
and a 5.0-100.0 %vol scale. The gas reading will be displayed in %LEL until
the gas level reaches 100 %LEL, or 5.0 %vol for methane. Once the gas
reading is above 100 %LEL, it is displayed in %vol. Alarm points exist for
the %LEL range but do not exist for the %vol range.
Catalytic (LEL) Sensor Screen
When either a TC sensor or an infrared combustible sensor is installed in an
EAGLE 2 along with a catalytic combustible LEL sensor, the user has the
option of turning off the catalytic combustible LEL sensor in Display Mode.
If the unit is going to be used for sampling known high-levels of combustible
gas or in areas with known catalytic sensor poisons such as silicone vapors,
the catalytic combustible sensor should be turned off. Even though this