Dave, Will the fuel will act as a di-electric material? If so you might try using 2 coaxially mounted metal tubes (air spaced as much as possible). Make the spacing between them as small as you can. Make sure they don't touch. Mount this assembly vertically in the tank, ensuring that the fuel level can rise and fall freely between the tubes. This will cause a change in capacitance between the tubes which is proportional to the level of fuel. I use this method to measure the level of liquid Nitrogen in a tank. It gives a full range of levels. Can anyone comment if it will work for fuel or not? Joe ----- Original Message ----- From: "Dave VanEe" To: Sent: Friday, September 21, 2001 7:09 AM Subject: Re: [EE]: Conductive Liquid Sensor > The tank will be in a racecar travelling at speeds up to 100mph. There will > be sloshing (some effort will be put in to reduce this). The float idea > seems to require excess mechanical components. Weighting the tank is not > really an options since that's extra weight on the car. If I had the need > for a full range of fuel levels I would use a float for sure, but since I > only need a few values I figure there's a better (easier) method out there. > > Dave > > PS: I caught the hint to check archives more, will do. > > > >Hi Dave, > > > >I'm pretty sure that gas does not conduct since conduction in liquids > >requires ions in the liquid and gas should have very few ions. > > > >What conditions does this have to work under? Does it have to work even if > >the tank is not level? Does it have to deal with "sloshing"? I'm pretty > >sure that the general consensus of this list (based on previous similar > >threads) is that float sensing is the best and simplest way, although > >weighing the tank might also be a workable solution. > > > >Sean > > > >At 09:16 PM 9/20/01 -0700, you wrote: > >>Hello, > >>I'm trying to make a simple fuel level indicator for a fuel tank. I only > >>need to be able to sense a few levels (i.e. Full, ~1/3 full, Near Empty). > >>I'm thinking of having two wires (or other electrical contact) > actually -in- > >>the gas, and using the fuel to "close the switch". I'm pretty sure this > >>would work for water, but I don't know if the gas will be able to conduct > >>electricity well enough. There is also the ignition issue, but at the > >>voltages I'd use it shouldn't matter. I will be using 94 Octane gasoline > >>for my purposes. > >> > >>Does anyone have any idea if this would work, or possibly have another > >>suggestion? > >> > >>Thanks, > >>Dave > >> > >>PS: I will be putting some gas in a container and checking the resistance > w/ > >>a multimeter to test it myself, but there might be a better solution. > >> > >>-- > >>http://www.piclist.com hint: The PICList is archived three different > >>ways. See http://www.piclist.com/#archives for details. > > > >--------------------------------------------------------------- > >NetZero Platinum > >Only $9.95 per month! > >Sign up in September to win one of 30 Hawaiian Vacations for 2! > >http://my.netzero.net/s/signup?r=platinum&refcd=PT97 > > > >-- > >http://www.piclist.com hint: The PICList is archived three different > >ways. See http://www.piclist.com/#archives for details. > > > > > > > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.