MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 75
Connecting a fuel level sender
Typical float
based level sender
We recommend
VDO senders
Connection to engine
ground (aircraft frame) and
negative terminal of battery
The Stratomaster RDAC EIS permits the connection of a standard automotive fuel level sender.
These senders can be obtained at automotive spares outlets at reasonable cost.
When you choose a float level sender, ensure that you select a model that is sturdy and promises
reliable and long lifetime. In particular, select a model that does not have any metal parts that can
rust.
The RDAC EIS can interface to a large variety of these fuel level senders. It does not matter if the
sender resistance increases or decreases with the fuel level as long as it changes. The
calibration procedure outlined “Set fuel tank” in the owners manual describes in great detail the
procedure to follow.
In essence, the calibration procedure will measure the resistance of the fuel level sender at
various fuel levels and then work out the readings in between those known settings.
Typical fuel level senders that can be used with the RDAC EIS have resistance ranges in the
region of 100 ohms to 500 ohms.
Tip:
It is possible to wire two fuel level senders in series if you have two fuel tanks. In this case the
reading will be shown of the combined fuel level in both tanks.
(Fuel level sender – continued from previous page)
Safety Hazard ! Please read this:
Be careful when installing fuel level senders into fuel tanks. Ensure that the fuel tank is
completely empty when you proceed with the installation. Ensure that the fuel tank is well
ventilated and does not contain any fuel vapors – these are highly explosive when mixed with air.
Ensure that at all times the ground connection (the connection of the fuel level sender mounting
flange) is securely connected to the aircraft frame (in case of a metal frame) and to the negative
terminal of the battery. In addition the negative terminal of the battery must at all times be
connected to the Supply ground terminal of the RDAC EIS.
