RKI Instruments Eagle Series - Manual (Page 87)

Eagle Instruction Manual Appendix J: Infrared Hydrocarbon Sensor • 80
Appendix J: Infrared Hydrocarbon Sensor
Appendix J describes the Eagle’s non-standard, infrared hydrocarbon
(HC) sensor. This appendix also offers additional information for
calibrating and replacing the infrared HC sensor.
Target Gases
The infrared HC sensor is a general hydrocarbon sensor and is
factory-calibrated to isobutane.
Specifications
Table 18 lists specifications for the infrared HC sensor. The alarm
settings are user-adjustable (see “Updating the Alarm Point Settings”
on page 33.)
Description
The infrared HC 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.
The infrared HC sensor is wired to the EC4 socket on the analog PCB
and the gas reading is displayed in channel 1. The HC channel can
also be displayed in PPM by using the LEL/PPM button.
Eagles with an infrared HC sensor do not include the standard
catalytic combustible gas sensor. Table 19 lists the sensor
configuration for Eagles that include this sensor. Not all channels may
be active in your Eagle.
Table 18: Infrared HC Sensor Specifications
Range Increment Alarm 1 Alarm 2 TWA STEL
0 to 100% LEL HC
0 to 18,000 PPM 1% LEL
200 ppm 10% LEL
1,800 ppm
50% LEL
9,000 ppm
N/A
N/A N/A
N/A
0 to 30.0% Volume HC 0.5% Volume N/A N/A N/A N/A
Table 19: Sensor Configuration for Eagles with Infrared HC Sensors
Channel Sensor Analog PCB Socket
1 Infrared HC EC4
2 Oxygen CN2
3 Toxic gas or infrared carbon dioxide EC1, EC2, or EC3