Electronics International FP-5L - Manual (Page 9)

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When displaying Fuel Flow, the FP-5(L) will operate as follows:
A. When set to display in Gallons the display will read in .1 Gal/Hr increments up to 199.9 Gal/Hr.
B. When set to display in Imperial Gallons the display will read in .1 Gal/Hr increments up to 162.0
Gal/Hr.
C. When set to display in Pounds the display will read in 1 Lb/Hr increments up to 1199 Lbs/Hr.
D. When set to display in Liters the display will read in 1 Ltr/Hr increments up to 749 Ltrs/Hr.
Special algorithms in the microprocessor are used to insure a quick response and a stable display. Also,
there are two programmable filter settings that will affect the stability and response of the fuel flow readings (see
the “Power-up Programmable Settings” section of this manual).
The accuracy of the displayed fuel flow is affected by the value of
the K Factor. The K Factor sets the calibration of the instrument to
match the flow transducer and the variations in the installation. The K
Factor may be changed by entering the "Power-up Programming
Mode" or it can be changed automatically by entering the "Auto Cali-
bration Mode."
When displaying % Horsepower, the FP-5(L) will operate as
follows:
A. Horsepower is calculated from fuel specifics (as is done
on engine dyno's) which takes into account manifold
pressure, RPM, altitude and OAT. Almost all spark ignition combustion engines have a fuel specific
of approximately .10 gallons per H.P. per hour at full rich mixture. The "Power-Up Programming
Mode" allows you to calibrate the FP-5(L) to match your engine at a full rich mixture.
B. If the AUX Channel is used to monitor an EGT, the FP-5(L) will compensate the displayed horse-
power as your lean your engine. Otherwise, as you lean for max power (100 ° to 150 ° F rich of peak
EGT) you may see a 5% to 8% drop in the displayed horsepower when you should see an approxi-
mately 3% increase in horsepower. Therefore, only display "HP" when your engine is running at
full rich mixture settings.
With EGT compensation on the AUX Channel, the FP-5(L) can be calibrated to your engine when
leaned (see the "Power-Up Programmable Settings" section in this manual).
C. The FP-5(L) was designed to display in % Horsepower (1% resolution). It is possible to calibrate the
FP-5(L) to display in raw horsepower. See the "Power-Up Programming Mode."
Warning: You should never lean your engine with power settings over the factory recommended level
(generally 65% to 75% power). Leaning with high power settings can cause detonation. Always verify your
power level with engine charts before leaning. As you lean past maximum horsepower (100°F to 150°F rich of
peak EGT) your engine will lose power and the FP-5(L) will show this.
Each flow transducer outputs a
different number of electical pulses
for each gallon of fuel that flows
through it. This value is called the
K Factor. The FT-60 has a K
Factor of approximately 68,000
pulses per gallon. The installation
and the type of engine (carbureted
or injected) can affect the K Factor.
What is a K Factor: