Electronics International FP-5L - Manual (Page 22)

3. The ability of the line attendant to fill the tank to the same mark. Also, the shape of the tank and the
dihedral of the wings can aggravate the situation.
Note: K Factor settings below 580 will cause the display resolution to increase above .1 Gal/Hr. when used
with a Display Update Time setting of "UP2." K Factors below 180 will cause the display resolution to
increase above .1 Gal/Hr. when used with a Display Update Time setting of "UP1." The FT-90 Flow Trans-
ducer has a K Factor around 198.
4. Filter:
There are two filters used by the FP-5(L) to remove fluctuation or jump in the fuel
flow readings. Selecting either filter will not affect the accuracy of the FP-5(L). Use
filter “F 1” for most fuel-injected engines. This filter has the fastest response time
(eight times faster than other flow gauges). Use filter “F 2” for most carbureted
engines. This filter has a slightly slower response time than F1 (still faster than other
flow gauges) but will take out any fluctuation or jump you may have seen using the F1 filter.
5. Display Update Time:
The Display Update Time may be set to "UP2" or "UP1." An "UP2" setting
causes the display to update two times per second and a .1 Gal/Hr. resolution can be
maintained for K Factors from 580 to 1999. A "UP1" setting causes the display to
update once per second and a .1 Gal/Hr. resolution can be maintained for K Factors
from 180 to 999. When using the FT-60 Flow Transducer use the "UP2" setting. When
using the FT-90 Flow Transducer use the "UP1" setting if .1 Gal/Hr. resolution is
required, otherwise a "UP2" setting would be preferred.
6. Fuel Flow at 75% Power (rich mixture) Setting:
This setting calibrates the % Horsepower Display Mode to your engine. This
procedure should be done after your have verified the calibration of the FP-5(L).
Changing the K Factor on the FP-5(L) will change the displayed Fuel Flow and the
displayed % Horsepower.
Fly your aircraft at cruise altitude (or, if necessary, at lower altitude where you can achieve 75% power) with
a rich mixture. Refer to operating charts from your aircraft or engine manufacturer to determine your power
setting. Record the fuel flow displayed on the FP-5(L) at 75% power (rich mixture). For this setting, program the
recorded fuel flow into the FP-5(L). When displaying the Fuel Flow at 75% Power a "r" will be displayed in the
lower left corner of the display.
The FP-5(L) can be set up to display raw horsepower by using the following procedure:
A. Record the Fuel Flow at 75% Power as described above. This value will be designated FF@75%
rich.
20
F 1
Blinking Digit
UP2
Blinking Digit
r 17.0
Gal/Hr
Blinking Digit