53 • Appendix B: Methane Elimination Eagle Instruction Manual
2. Allow 2 minutes for the combustibles sensor to stabilize.
3. Perform the demand zero procedure as described in “Preparing
for Calibration” on page 41.
Monitoring Combustible Gases Other Than Hexane
Use Table 7 to determine the concentration of combustible gases other
than hexane. This table is based on the Eagle being 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 0.67 = 7% LEL toluene.
To determine the concentration of other combustible gases with the
Eagle in full response mode and calibrated to methane, see Table 4 on
page 12.
Table 7: Methane Elimination Mode Conversion Factors (Hexane Calibration)
Target Gas LEL Factor PPM Factor Target Gas LEL Factor PPM Factor
Acetone .63 2.53 Isopropanol .73 .96
Benzene .95 1.06 Methane No
Response
No
Response
Butyl Acrylate
**
1.23 Methanol .6 2.02
Butyl Acetate 1.45 3.30 Methyl Acetate .56 1.20
2-Butyl Alcohol 1.5 3.41 Methyl Acrylate .65 1.20
1-Butyl Alcohol 2.10 2.02 Methyl Ethyl
Keytone
.99 1.94
Cyclohexane .93 1.26 Methyl Isobutyl
Keytone
.99 1.03
Cumene 1.96 .96 Mixed Xylenes .99 1.06
Ethylene
Dichloride
1.85 .85 Nonane 1.43 1.52
Ethyl Alcohol .68 1.23 Pentane .76 1.04
Ethyl Chloride .57 .60 Propane .63 1.20
Ethyl Acrylate 1.19 2.53 Styrene 1.37 1.14
Hydrogen .44 1.36 Toluene .67 1.45
Isobutane .71 1.16 Vinyl Acetate
Monomer
1.18 1.97
** Vapor pressure too low for significant LEL reading.
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