hey!
That's the trouble with capacitance - it wants to know what it's
looking at.......
However, it IS capacitance. Therefore one could 'fudge' the reading by
adding or applying a subsidiary capacitance (or if it's calculated to
resistance at the gauge) to fool it. That would mean working out a circuit
to insert for whichever parameter one wants - say, 100LL or Mogas. I'm not
there yet, but will have to do something like that if I want accuracy.
Failing that, one could apply a secondary scale to the gauge to
read the secondary fuel type quantity. Whichever method means measuring,
measuring and plotting.
Good luck, I think,
Ferg
A064
Oh, oh. I think PFA may want a word over there...................
----- Original Message -----
From: "Rmi Guerner" <air.guerner@wanadoo.fr>
Subject: Europa-List: funny fuel gauge
|
|
| Hi all,
| Surprisingly I get just the opposite with the Avelec capacitance fuel
gauge: when full with mogas I consistently read 60 liters, and with Avgas
100LL I read 50 liters.
| I also have another problem with this fuel gauging system: from time to
time I have an "fuel tank fault" indication, or zero indication while the
tank is full. Very difficult to troubleshoot as the problem is intermittent.
Yesterday it happened only during a few minutes in the middle of a 3 hours
flight. Any idea?
| Remi Guerner
| F-PGKL, XS 912S, s/n 395 monowheel, 320 hours
|
|
| Subject: Re: Europa-List: Funny fuel gauge
|
<peter.rees05@ntlworld.com>
|
| Thats exactly the problem we had. Problem is that the gauge was calibrated
| for Avgas - when we changed to Mogas, the gauge said that the tank was
| always 3/4 full.
|
|
|
|
|
|
|