Dynon Avionics FlightDEK-D180 Installation Guide - Manual (Page 72)

EMS Configuration
Fuel Flow
If the fuel flow transducer has been installed,
set the DISPLAY parameter to either TEXT
or DIAL. When set to TEXT, the fuel flow
indication is displayed as a numerical value
above a graphical fuel pressure dial. When set
to DIAL, the opposite is true. Note that
changing this value toggles the equivalent
value in the FUEL PRESSURE menu. Fuel
flow can also be displayed as an info bar, as
described in the FlightDEK-D180 Pilot’s User
Guide > Global Configuration Settings > Info Item Configuration
section.
6-14 FlightDEK-D180 Installation Guide
Select the alarm mode and the analog bar thresholds as described in
Alarm and Color Threshold Configuration on page 6-2. Next, find the
K-value associated with your fuel flow transducer. If you have the
Floscan 201B (Dynon P/N 100403-001), this number can be found
on the tag that came with the transducer. The K-value for your
transducer is 10 times the number shown after the dash. So, if
your transducer had the tag shown at right attached to it, you would
enter a K-value of 29590 in the K-VALUE section of the Fuel Flow
configuration menu. If you have lost your tag, a starting K-value of
30000 will be close enough to begin using the function.
If you have the EI FT-60 “Red Cube” (Dynon P/N 100403-003),
enter a starting K-VALUE of 68000.
Over time, you may notice that the instrument’s computation of
gallons or liters remaining (based on fuel flow) is either high or low. This is a result of many
factors, including individual installation. To correct for this, follow this procedure:
Over several fill-ups keep a running total of the amount of fuel added. Keep a running total of
the GALS (or LTRS) USED parameter over this same time span.
Perform the following calculation:
) (
) (
actual FuelFilled
computed FuelUsed
. You should obtain a number that is
close to 1. We’ll call this number, KFactorRatio.
Now perform this calculation: CurrentKFactor*KFactorRatio. Enter this number as your new K-
Factor.
Observe the results over your next tank for accuracy. Repeat the above if necessary.
The general rule of thumb: if your GALS (or LTRS) USED reads higher than you expect,
increase the K-factor; if it reads lower than you expect, decrease the K-factor.
If the GLOBAL > ENGINE TYPE setting is set to ROTAX, a return flow (RETRN FLOW)
setting is available in this menu. This function is generally used only by Original Equipment
Manufacturers (OEMs).