MGL Avionics Stratomaster Ultra Horizon XL Owner’s manual
Page 35
This is now the “level sender reading at 0 Lt” position. Move the highlight to this position and
wait until the sender reading has stabilized (You will see the sender reading at the top line).
This could take up to a minute so have patience.
Should this number not react to changes of your level sender position, then you have a
problem. Please check your wiring according to the installation section of this manual.
If you see the number changing then everything is well. Once it has stabilized and the
highlight is on the 0 Lt position, press the “select” key to transfer the reading from the sender
to the calibration point.
Now you are ready for the next step. Add the required amount of fuel to get to the next level
(In our case 9 Lt – this is 20% tank capacity). Once done, wait for the reading to stabilize and
press “select” again after you have moved the highlight to the “9 Lt” position.
Proceed in a similar manner until you have reached the last calibration position at 100% tank
capacity.
You are done !
Press “Menu” to exit this function. This will write the new calibration to permanent memory in
the instrument. You can repeat this calibration many times so do not worry if you do not get it
right the first time.
The instrument uses the 6 calibration points to work out a correction curve that takes into
account the tolerances of your fuel level sender and the shape of your fuel tank. This results
in an incredibly accurate and usable fuel level display that far exceeds that available from
ordinary dial type gauges.
Note:
The calibration positions may be edited by using the + and – keys. This allows you, in theory,
to copy calibration settings from one instrument to another. We however recommend that you
do go though the calibration procedure even if the two aircraft are identical in all respects.
Tolerances do exist and the calibration cancels these out.
Accurate fuel level displays are a vital safety factor for an aircraft and a very useful feature for
peace of mind during cross county flights.
Notes on Slope error
Sender value is a value determined by the Stratomaster Ultra. It is used to calculate e.g. fuel
level, fuel bingo estimate and current range estimate. The fuel tank setup sender value can
either increase in value as fuel is added on decrease in value if fuel is added. This is
dependant on the type of fuel level sender used. However should the second reading be
larger than the first reading all readings will have to be larger than the previous reading.
Likewise should the second reading be smaller than the first reading all readings will have to
be smaller than the previous reading. If this is not the case the wording "Slope error" will be
displayed. This could happen when fuel was removed instead of added between steps, no
fuel was added between steps or when the fuel level sender was moved in the wrong
direction e.g. moving the fuel level sender manually when it is not inserted in to the fuel tank.
Should you get a slope error message determine the cause of the error. If you do not know
the cause of your error it is best to start from scratch. It should be remembered that accuracy
is the fuel tank calibration is very important to enable your Stratomaster Ultra to display the
correct data.
