MGL Avionics Stratomaster Ultra Horizon XL Owner’s manual
Page 47
Set the required alarm level in the Engine detail setup menu (page
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). Most requirements would use a minimum pressure of 1.5 to 2.0 Bars (20 – 30
PSI).
The oil temperature indicator
The RDAC EMS can interface to standard VDI oil temperature sender (these are used in
Rotax 912/914 engines as well).
These senders exhibits a resistance of 100 ohms at 85 degrees C and 1000 ohms at 20
degrees C.
It is also possible to use the MGL precision semiconductor sender instead of a standard
automotive sender. This sender, although more expensive, is very accurate and does not
suffer from the wide tolerances of standard automotive components. You need to select the
type of sender used for the oil pressure in the “sender setup menu”. The default sender
selected is the standard automotive type.
The Ultra HXL also allows you to use Westach NTC senders as well as a user
programmable probe (here you can set the Ultra to recognize the characteristics of just
about any NTC type sender).
You can enable minimum and maximum temperature alarms for oil temperature. Should any
alarm be active the temperature readout will flash.
Manifold pressure indicator
Manifold pressure is used in aircraft with variable pitch propellers to monitor and
set engine power. In turbo boosted engines it can also be used to monitor the
amount of boost pressure delivered by the turbo charger.
The MAP indicator can be setup to give a readout in millibars, inches of mercury or psi.
Select the required units in the Mode and units setup menu.
Manifold pressure is displayed relative to sea level atmospheric pressure on a standard day
(1013.25 millibars). You can select the width of the window you would like the display to use.
For example, if you select a 100 millibar range, the bargraph will show from 913 to 1113
millibars.
You select the display range in the Engine detail setup menu.
Please note: before you can use the MAP indicator for the first time, you must perform the
MAP sensor calibration as explained in the Calibration menu section of this manual.
The fuel flow and fuel level indicators
The Ultra Horizon XL provides you with options to connect up to two physical fuel
tank level senders plus a fuel flow sender.
You can choose to display a single or a dual tank system, any tank level can be
based on a calculated fuel level if you have a fuel flow sender.
The fuel flow indicator
If you have a fuel flow sender installed this instrument will show you your current fuel flow
per hour. The indication will be in liters per hour, imperial or U.S. gallons per hour. Select
this in the mode and units setup menu.
Fuel flow rate is an important and useful indicator showing you the health status of your
engine and fuel system. We recommend from actual past experience that you include the
fuel flow rate in your pre-flight checks at engine run up time. You will soon know what fuel
