MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 36
Combined Oil temperature and Oil pressure indicator
Should you select both oil temperature and oil pressure indicators in
the “Engine detail setup menu” then you will get a display as shown on
the left.
Pressure is shown either in bar or psi as selected in the “mode setup
menu”. Temperature units are selected in the same menu and can be
either degrees F or degrees C.
Should you have a requirement to measure oil pressure, select the oil pressure bargraph
display by selecting the label to “OILP” in the engine detail setup menu.
Please select the required oil pressure sender setting under the “Sender setup menu”.
The RDAC IV EIS supports standard resistive automotive oil pressure senders. These are
available in a number of different resistance ranges and as a consequence, the Stratomaster
Ultra allows you to select resistance range in steps of 50 ohms from 50 ohms to 1000 ohms.
The sender fitted to a Rotax 912 for example has a 200 ohm resistance. The RDAC expects
resistance to increase with pressure, with the maximum resistance at 10 bars (145 PSI).
Should you have a sender with a maximum pressure rating of less than 10 bars, please
select the resistance setting in such a way that correct pressure reading would be obtained at
the maximum pressure sender output.
Oil pressure can be displayed in PSI or BAR. Select your preference in the “mode menu”
(see page 42).
Please note: Should you switch on alarms for the oil pressure reading, the alarm will be
activated if oil pressure falls below the set level. This implies that the alarm will be activated
should you switch your engine off.
Set the required alarm level in the Engine detail setup menu (page 42). Most requirements
would use a minimum pressure of 1.5 to 2.0 Bars (20 – 30 PSI).
Enabling the oil temperature display is done in the Engine detail setup menu. Select the
label for the oil temperature channel to “OILT”.
The RDAC IV EIS can interface to the oil temperature sender used in Rotax 912/914
engines. This is a standard sender that can be obtained from automotive spares outlets.
The Rotax sender 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.
