SV-EMS-220 Engine Monitoring System Installation and Configuration
10-28 SkyView HDX System Installation Manual - Revision E
Alarms are only triggered when ALARM: SELF-CLEAR or LATCHING and the value
enters a Red range on a gauge. When values enter into a Yellow range, their numerical
value is highlighted in Yellow to annunciate the caution condition.
10.7.3.5 Fuel Computer Configuration
Setting Pulses/Gallon
To find and configure the pulses/gallon value associated with your fuel flow sensor:
The fuel flow sensor requires a starting K-VALUE of 68000 under SETUP MENU >
HARDWARE CALIBRATION > EMS CALIBRATION > FUEL FLOW CALIBRATION.
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:
)(
)(
actualFuelFilled
computedFuelU sed
. You should obtain a number that
is close to 1. We’ll call this number, FuelFlowRatio.
Now perform this calculation: CurrentPulsesPerGallon*FuelFlowRatio. Enter this number
as your new pulses/gallon value.
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 pulses/gallon; if it reads lower than you expect, decrease the pulses/gallon.
If your engine has a return fuel flow sensor, note that there is a second pulses/gallon
setting that is mapped to a second set of input pins. When a second fuel flow sensor is
connected, and the pulses/gallon is adequately set, the fuel seen returning through the
second fuel flow sensor is automatically subtracted from the flow that is seen through the
primary sensor. If you do not have a second fuel flow sensor, you may ignore this setting
entirely.
In SETUP MENU > HARDWARE CALIBRATION > EMS CALIBRATION >
FUEL FLOW CALIBRATION, if you change PULS/GAL (C37 P14) or
PULS/GAL (C37 P19), for the new value to be active, you must push the
ACCEPT button, then the EXIT button. Until you EXIT the menu, the changed
value is not used by SkyView (despite the value being changed in the menu).
Fuel Computer Presets
Fuel Computer computations are based on measured fuel flow and the pilot’s input of the
aircraft’s starting fuel state. SkyView offers a few settings that allow the pilot to pre-
program full fuel and an optional second “preset” fuel quantity. Once programmed, typical
aircraft fuel loads are then quickly recalled under in the EMS > FUEL menu as described
in the Pilots User Guide.
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