RKI Instruments Eagle Series - Manual (Page 22)

Diffusion Eagle Instruction Manual Operation • 17
Monitoring Combustible Gases Other than Methane
If the combustible gas sensor is calibrated to methane (CH
4
), use
Table 4 to determine the concentration of combustible gases other than
methane. This table is based on Eagles in full response mode (methane
elimination switch set to CH4) and calibrated to methane. Multiply the
display reading by the factor in the appropriate column in the table. For
example, if you are using the Eagle to detect hexane and the display reads
10% LEL, the actual hexane reading is
10% x 3.00 = 30% LEL hexane.
WARNING: The Eagle’s alarms are initiated by the DISPLAY reading not
the FACTORED reading. If you are monitoring for hexane as
in the example above and the low alarm is set for 10% LEL, the
Eagle will initiate a low alarm at 30% LEL hexane (display
reading of 10% LEL).
To determine the concentration of other combustible gases with the Eagle in
methane elimination mode, see Table 7 on page 59.
Table 4: Full Response Mode Conversion Factors (Methane Calibration)
Target Gas
LEL Factor
(Methane Calibration)
PPM Factor
(Methane Calibration)
Benzene 2.80 0.67
Ethane 1.40 0.84
Ethanol 2.25 1.5
Ethylene 1.58 0.4
Hexane 3.00 0.67
Hydrogen 1.65 1.4
IPA 2.83 1.13
Isobutane 1.93 1.21
MEK 3.00 1.08
Methane 1.00 1.00
Methanol 2.33 2.57
Propane 2.30 0.92
Propylene 2.00 0.80
Toluene 2.80 0.67