MGL Avionics FF-1 Manuale utente

Introduction

The FF-1 fuel management computer is a 2.25” instrument intended for efficient monitoring of fuel related information for

single or dual fuel tanks onboard small aircraft and related applications.

The FF-1 unit can connect to one or two fuel flow senders, one or two fuel level senders or both. Full functionality is

available with both senders or only with a fuel flow sender using calculated fuel levels based on fuel usage. Differential

fuel flow calculations are also supported for fuel return systems. Fuel injector systems are also supported.Standard

automotive fuel level senders can be used, even with odd shaped tanks due to a comprehensive, multi-point calibration

system. Most fuel flow senders can be used and the K-factor of the sender can be entered into the system for simple

calibration. MGL Avionics supplies a lightweight dual range fuel flow sender that is ideally suited for the FF-1.

In addition, the FF-1 can use the airspeed (via the airtalk cable connected to a Infinity ASI-1/ASX-1 indicator) or actual

ground speed (by using the optional FF-1 to RS232 GPS cable connected to a RS232 NMEA enabled GPS receiver) to

determine fuel range.

1 Features

•Advanced fuel computer with 17different modes of operation

•Supports single or dual fuel tanks

•The FF-1 can connect to one or two fuel flow senders, fuel level senders or fuel injectors

•Differential fuel flow calculations are also supported for fuel return systems

•The FF-1 has the ability to connect to anASI-1/ASX-1 or a NMEA enabled GPS receiver for range based

calculations. It can also accept a manually entered estimate cruising speed if an ASX-1/GPS is not

available.

•Standard automotive fuel level senders can be used, even with odd shaped tanks due to a comprehensive,

multi-point calibration system

•Bilingual support (English and French)

•Standard 2.25” aircraft enclosure (can be front or rear mounted)

•Rotary control plus 2 independent buttons for easy menu navigation and user input

•Alarm output as well as a red LED illuminates when the fuel level is below the fuel level alarm value

•Large backlit graphic LCD with adjustable contrast

•On board voltage reversal and over voltage protection for harsh electrical environments

•SMPS (switch mode power supply) for use in both 12V and 24V systems as well as for reduced power

consumption

•1 year limited warranty

FF-1

Fuel management computer for

single or dual fuel tanks

Operating Manual –English 1.10

FF-1Operating Manual Page 2

2 FF-1Layout

3 Main Displays

The FF-1 has 17different modes of operation.The display modes can be selected in the fuel setup menu by selecting

different configurations of the number of fuel flow/level senders installed. The FF-1 will automatically adjust the display

according to these settings.

Backlit g

raphic

LCD d

isplay:

Contrast and backlight can be adjusted

in the menu system

Harness:

Harness connects

to power, fuel flow

and fuel level

senders

Up/F1 Bu

tton:

Up button in menu system

Normal mode:

Manual speed input if the

speed setting is set to

“MANUAL”

Speed display if the speed

setting is set to “AIRTALK”

or “NMEA”

Down/F2 Button

Down button in menu

system

Normal mode:

Manually enter your

current fuel level after

fueling or defueling your

aircraft

Rotary Control (Up/Down) & Enter Button

Press the rotary control during normal mode to access the menu system. Rotate anti/clockwise

for up/down menu scrolling. During normal mode turning the rotary control will display

the

alternate fuel information screen (Display mode dependant, see section 3.1).

LED a

larm:

The red LED will illuminate if any of the

fuel tank levels are below the fuel level

alarm

value

FF-1Operating Manual Page 3

3.1Single fuel flow and calculated tank level (single tank)

Single fuel flow and fuel level sender (single tank)

Differential fuel flow and calculated tank level (single tank)

Differential fuel flow and fuel level sender (single tank)

Summed fuel flow and calculated tank level (single tank)

Summed fuel flow and fuel level sender (single tank)

Alternate main screen for the above display modes

This display can be selected by rotating the rotary control.

Fuel range Fuel endurance

hours:minutes

Fuel flow unit

Fuel level unit

Fuel level

Fuel low alarm level

Fuel flow

Digital fuel

level value

FF-1Operating Manual Page 4

3.2 Dual fuel flow and calculated tank levels (dual tank)

Dual fuel flow and dual fuel level senders (dual tank)

3.3 Single fuel flow and dual fuel level senders (dual tank)

Differential fuel flow and dual fuel level senders (dual tank)

Summed fuel flow and dual fuel level senders (dual tank)

3.4Single fuel flow only indicator

This mode is displayed if either fuel flow 1 or fuel flow 2 is selected and no fuel level senders are selected.

Fuel flow unit

Fuel flow value

Fuel tank 1 level

Fuel tank 2 level

Fuel flow unit

Fuel endurance

hours:minu

tes

Fuel range

Fuel flow 1 value

Fuel flow 2

value

Digital fuel

level 1 value

Digital fuel level 2 value

Fuel low alarm level

Digital fuel

level 2 value

Digital fuel

level 1 value

Fuel flow unit

Fuel endurance

hours:min

utes

Fuel range

Fuel tank 1 level

Fuel tank 2 level

Fuel low alarm level

Fuel flow value

FF-1Operating Manual Page 5

3.5Dual fuel flow indicator

This mode is displayed if both fuel flow 1and fuel flow 2 are selected and the fuel mode is selected for dual flow.Both fuel

level senders are disabled.

3.6Single tank level indicator

This mode is displayed if either fuel level 1 or fuel level 2 is selected.Both fuel flow senders are disabled.

3.7 Dual tank level indicator

This mode is displayed if both fuel level 1 and fuel level 2 are selected. Both fuel flow senders are disabled.

Fuel flow 1

display

Fuel flow 2

display

Fuel flow unit

Fuel level unit

Remaining fuel

in tank

Full tank value

Fuel low alarm

level

Fuel level unit

Remaining fuel in tank 1

Remaining fuel

in tank 2

FF-1Operating Manual Page 6

3.8 Differential/Summed fuel flow

This mode is displayed if both fuel flow 1 and fuel flow 2 are selected and the fuel mode is selected for either differential

or summed.

3.9Enter cruising speed

Press the F1key during the main display screen to manually enter your aircraft’s cruising

speed. This value will be used to calculate the fuel range, i.e. how far you can fly with the

remaining fuel at zero wind speed. For this calculation, your current remaining fuel, your

current fuel flow and the speed entered here are taken into account. You can easily

change the speed during flight to reflect changes in ground speed or cruising speed. Use

this function with care and do not use it to extend your range. You must at all times have a

secondary indication of available fuel. Note that flow senders and level senders may be

subject to malfunction that may result in incorrect fuel levels being displayed or calculated.

This function is only available in certain display modes and if the speed menu option is set

to manual.

3.10 Airtalk airspeed /GPS ground speed display

Pressing the F1key during the main display will show the

current airspeed (using the ASX-1 indicator) or ground

speed (using a NMEA enabled GPS receiver). This value

is used for fuel range calculations.

3.11 Enter starting level of fuel tanks

Press the F2key during the main display screen to manually enter your current fuel level

after fueling or defueling your aircraft. This function is only available if you have a mode

selected where fuel level is calculated from fuel flow.

Note:It is good airmanship to take into account a “silent” fuel reserve. For example, if you

have a 50 liter tank and you fill it, enter 40 or 45 liters as your available fuel.

Fuel flow reading

from fuel flow

sender 1

Fuel flow reading

from fuel flow

sender 2

Differential (fuel flow 1 minus fuel flow 2)

or Summed (fuel flow 1 plus fuel flow 2)

fuel flow reading. Fuel flow unit

FF-1Operating Manual Page 7

3.12 Incorrect fuel setup message

The following message will be displayed if the FF-1 is setup incorrectly. For example if

both fuel flow senders are disabled and a single/dual fuel level(s)are setup for calculated

fuel tanks.

4 Menu System

Pressing the rotary control button during the normal display mode will cause the FF-1 to enter the menu system. Use the

up/down keys or the rotary control to navigate through the menu system.

4.1 Exit Menu

Pressing the rotary control on this menu item will cause the FF-1 to exit the menu system. All

changes made during navigation of the menu system will be saved in non-volatile memory on exiting

the menu system.If you remove power before exiting the menu the instrument will not save any

changes.

Note:

(“ADC Values”menu item is only visible when powering up the unit and pressing the

rotary

control). The text “CALIBRATE” will appear on the intro screen when entering this mode.

FF-1Operating Manual Page 8

4.2 Fuel Totals

These are 2 independent accumulators for fuel tank 1 and fuel tank 2 that totalize the amount of fuel

burn since the last time the accumulators were reset to zero.

Move the highlight over the “DONE” menu item and press the rotary control to return to the main

menu.

Select this menu option to reset the fuel totalizers to zero.

4.3Display Setup

Move the highlight over the “DONE” menu item and press the rotary control to return to the main

menu.

Select this menu option to adjust the display contrast.

Select this menu option to turn the backlight on or off.

Select your preferred language for the FF-1. English or French.

4.4Fuel Setup

This menu will customize itself to the various options you choose. The full fuel setup menu is shown.

FF-1Operating Manual Page 9

Move the highlight over the “DONE” menu item and press the rotary control to return to the main

menu.

Select your desired units for distance and fuel quantity. The following options are available:

L/sm: Liters and statute miles

G/sm: U.S. Gallons and statute miles

L/nm: Liters and nautical miles

G/nm: U.S. Gallons and nautical miles

L/km: Liters and kilometers

G/km: U.S. Gallons and kilometers

Select which speed will be used for range based calulations. You can select beteween “MANUAL”

(Manually enter a cruising speed), “AIRTALK” (airspeed obtained from the ASX-1), or “NMEA”

(obtained from a RS232 NMEA enabled GPS receiver) .

Select the Baud rate of your NMEA GPS receiver.

Select if there is a fuel flow sender connected to the FF-1’s fuel flow 1 input.

The K-Factor is the number of pulses generated by the fuel flow sender for one liter of fuel. The dual

range fuel flow sender supplied by MGL Avionics has a K-Factor of 7000 in the low flow mode (jet

installed) and 1330 for the high flow mode (no jet installed). The Flowscan 201A-6 has a K-Factor of

8454. You can use the K-Factor to calibrate your fuel flow sender. See the installation section for

more details on how to calibrate and install the fuel flow sender.

Select if there is a fuel flow sender connected to the FF-1’s fuel flow 2input.

The K-Factor is the number of pulses generated by the fuel flow sender for one liter of fuel. The dual

range fuel flow sender supplied by MGL Avionics has a K-Factor of 7000 in the low flow mode (jet

installed) and 1330 for the high flow mode (no jet installed). The Flowscan 201A-6 has a K-Factor of

8454. You can use the K-Factor to calibrate your fuel flow sender. See the installation section for

more details on how to calibrate and install the fuel flow sender.

Select if you want to measure fuel flow using a fuel flow sender or by using fuel injectors.

Select whether the FF-1fuel flow input is connected to the high or low side fired fuel injector.

If both fuel flow sendersare selected then select if theyare operating on individual fuel tanks (dual)

or if they are operating in a supply/return type fuel system (differential).

FF-1Operating Manual Page 10

Select this menu item to setup the fuel level for fuel tank 1. See below for more details.

Select this menu item to setup the fuel level for fuel tank 2. See below for more details.

Fuel level setup. (Only tank 1 setup is shown, follow the same steps

for tank 2 setup)

Move the highlight over the “DONE” menu item and press the rotary control to return to the fuel

setup menu.

Select if fuel tank 1 has a physical fuel level sender connected to it or if the FF-1 must use a

calculation based virtual fuel tank. If you do not want any fuel level information then set this

parameter to off.

Enter the size of the fuel tank in your system. It is recommended to choose a size that is slightly less

than actual size so you can compensate for sender inaccuracies and give you a measure of reserve

fuel.

Select whether to turn the fuel tank 1 level alarm on or off.

Enter your desired minimum fuel value that you would like to trigger the fuel low alarm. The fuel low

alarm will result in the flashing of the fuel level display and remaining fuel readout. You can also

connect a warning lamp to the external alarm output (see installation diagram). Note that the fuel low

level will be displayed as a vertical line on your fuel level display. This level is over and above your

“silent” fuel reserve.

See section 4.4.1 on how to calibrate the fuel level senders.

Select the damping factor for the fuel level. A selection of none, low, med or high can be made.

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