RKI Instruments Eagle Series - Manual (Page 64)

Diffusion Eagle Instruction Manual Appendix B: Methane Elimination • 59
3. Perform the demand zero procedure as described in “Preparing for
Calibration” on page 46.
Monitoring combustible gases other than hexane
Use Table 7 to determine the concentration of combustible gases other than
hexane. This table is based on Eagle’s in methane elimination mode (methane
elimination switch set to HEX ON) and calibrated to hexane. Multiply the
display reading by the factor in the appropriate column. For example, if you
are using the Eagle to detect toluene and the display reads 10% LEL, the
actual toluene reading is 10% x 0.90 = 9% LEL toluene.
To determine the concentration of other combustible gases with the Eagle in
full response mode, see Table 4 on page 17.
WARNING: The Eagle’s alarms are initiated by the DISPLAY reading not
the FACTORED reading. If you are monitoring for toluene as
in the above example and the low alarm is set for 10% LEL, the
Eagle will initiate a low alarm at 9% LEL toluene (display
reading of 10% LEL).
Table 7: Methane Elimination Mode Conversion Factors (Hexane Calibration)
Target Gas
LEL Factor
(Hexane Calibration)
PPM Factor
(Hexane Calibration)
Benzene 0.90 0.98
Ethane Low response Low response
Ethanol 0.75 2.25
Ethylene 0.53 0.57
Hexane 1.00 1.00
Hydrogen 0.55 2.00
IPA 0.98 1.77
Isobutane 0.74 1.21
MEK 0.91 1.49
Methane No response No response
Methanol 0.91 4.56
Propane Low response Low response
Propylene 0.69 1.26
Toluene 0.90 0.98