Converting Digital Multimeter Frequency Readings To Ethanol Percentage; Diagnostic Procedures; Ethanol Blended Fuel (E85) Diagnostic Procedure - Kent-Moore J-44175-A Manuel D'instructions

"Air frequency"
Fuel example A
Fuel example B
Fuel example C
"Acetone frequency"

DIAGNOSTIC PROCEDURES

Converting Digital MultiMeter frequency
readings to ethanol percentage
To convert the frequency output of the tester into
ethanol percentage, subtract 50 from the AC
frequency displayed on the Digital Multi Meter. The
result will be ethanol percentage. See examples
listed below.
AC frequency Hz displayed on DMM
Should be between 35 Hz and 48 Hz
50 Hz
58 Hz
135 Hz
Should be between 130 Hz and 142 Hz
ETHANOL BLENDED FUEL (E85)
DIAGNOSTIC PROCEDURE
The term "blended fuel" used in this manual refers
to an alternative fuel ethanol/gasoline mixture
called E85. This fuel has also been called Flexible
Fuel or Alternative Fuel-Ethanol. The ethanol
percentage of E85 is much higher than the
maximum allowable10% ethanol often found in
"normal" gasoline. Fuel stations that sell this type
of fuel have dispensing pumps that are clearly
marked E85, meaning a mixture of up to 85%
ethanol with the remainder of the mixture being
gasoline. The actual ethanol percentage varies
according to seasonal requirements.
When using the J-44175-A fuel Composition Tester,
measured ethanol values between 60% and 91%
(the tester's AC frequency signal between 110 Hz
and 141 Hz) are acceptable for E85. Measured
ethanol limits are slightly larger than ASTM
specifications due to the combination of equipment
Figure 6
9
Subtract 50 Ethanol Percentage
—
– 50 0% Ethanol
– 50 8% Ethanol
– 50 85% Ethanol
—
—
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