Eagle Instruction Manual Appendix E: Infrared Methane Sensors • 66
Appendix E: Infrared Methane Sensors
Appendix E describes the Eagle’s non-standard, infrared methane
sensors. This appendix also offers additional information for
calibrating and replacing the infrared methane sensors.
Target Gases
The infrared methane sensors are setup for and factory-calibrated to
methane. This section lists other combustible gases known to respond
and to not respond to the infrared methane sensor. Consult RKI
Instruments, Inc. for combustible gases not listed below.
The following combustible gases are also known to respond to the
infrared methane sensors: ethane, hexane, IPA, isobutane, MEK,
propane, toluene.
The following combustible gases are known to not respond or
respond poorly to the infrared methane sensor: acetylene, hydrogen,
styrene.
Specifications
Table 13 lists specifications for the infrared methane sensors. The
alarm settings are user-adjustable (see “Updating the Alarm Point
Settings” on page 32.)
Description
The infrared methane sensor is mounted in the front half of the
instrument case. The sensor is attached and wired to a dedicated
amplifier, which includes ZERO and SPAN controls. A bracket secures
the sensor/amplifier assembly to the instrument case.
Eagles with an infrared methane sensor that has a 0 to 100% LEL
range do not include the standard catalytic combustible gas sensor. In
Table 13: Infrared Methane Sensor Specifications
Range Increment Alarm 1 Alarm 2 TWA STEL
0 to 100.0% LEL CH
4
0 to 50,000 ppm
0.5% LEL
100 ppm
10.0% LEL
5,000 ppm
50.0% LEL
25,000 ppm
N/A
N/A
N/A
N/A
0 to100.0% Volume CH
4
0.5% Volume 10.0% VOL 20.0% VOL N/A N/A
Autoranging %LEL/%Volume
0 to 100% LEL
0 to 50,000 ppm
0 to 100.0% Volume
1% LEL
500 ppm
0.5% Volume
10% LEL
5,000 ppm
N/A
50% LEL
25,000 ppm
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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