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Fuel Tank Calibration
Posted: Thu Jul 28, 2022 3:21 pm
by Waldopilot
I have Dynon capacitance fuel tank sensors connected via the dynon capacitance to voltage converters to the mgl
RDAC XF. It seems impossible to calibrate these senders and I,m wondering if they are compatible?
Re: Fuel Tank Calibration
Posted: Fri Jul 29, 2022 7:29 am
by rainier
Yes they work quite well.
They output a voltage in a relatively narrow band so it is important that the ground supply of the level sender and the RDAC is the same (i.e. the two ground connections should run to a common point - usually at the RDAC itself. This avoids any additional voltages from adding and subtracting from the Dynon due to ground currents.
Make sure the pull-up resistors of your RDAC are switched off.
Also you must use avgas only - capacitive probes do not work with today's automotive fuels and tend to be next to useless as the fuel composition and the dialectric constant varies greatly.