RE: Europa-List: sight tubeGreg
I too am looking at going with the Odyssey, and i asked the australian
distributor about fuel senders. and they indicated that the resistive sender
is preferred, but only because they feel it to be more accuate, I was told
it would work fine with the capacitance type sender but readings will vary
depending on fuel type used, which i believe has been covered quite a bit
here already. It is possible though that the distributor has it wrong.
One thing i was considering was another circuit between
the EFIS and my capacitance sender so i can calibrate the sender to the fuel
type to get a more accurate reading depending on AVGAS / MOGAS / Blend of
the two
contents in the tank itself.
craig
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Greg Fuchs
Sent: Tuesday, 5 August 2008 2:34 PM
To: europa-list@matronics.com
Subject: RE: Europa-List: sight tube
Yes, it looks like I would be able to use the same input conditioning for
an EFIS that you used for the PIC. I would need both the 12V regulator
(sensor and Burr-Brown amp) and 5 volt regulator to use the clamping
diodes.
I looked up info on the Odyssey again, and it will handle up to two tank
inputs, but it wants resistive inputs to its engine management system.
Remembering back, this is another reason I went with a standard float type
sensor.
That said, I think an analog fuel level gauge would look nice (and fit) on
the center console, close to the fuel valve. Could simplify, and get rid of
the clamp circuit. Linearity of fuel used might be my only problem then,
and that is where reverting back to the PIC circuitry may have to happen.
Chasing my tail in this paragraph. J
If I had stuck with the Dynon EFIS idea, it would have made this part
easier.
Greg F
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From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Tony Krzyzewski
Sent: Monday, August 04, 2008 4:44 PM
To: europa-list@matronics.com
Subject: RE: Europa-List: sight tube
> My current plan is to go with an MGL Avionics Odyssey. I bet I can take
the
> sensor output and slightly re-scale it to match the Odyssey input
needed,
> but have not looked at it yet.
If you are using a system that a 0-5v input and has it's own scaling
capability (such as the Dynon) then all you need is the power supply,
pressure transducer, amplifier and clamping diode part of my circuit. I'd
just add a 22k ohm resistor in the output line to limit the current.
Fill the tank and then adjust the potentiometer on the amplifier to give
you 5v at the input of your instrument. Once you have done that you can
follow the linearisation process provided by the instrument manufacturer.
Tony
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