Have you thought of using a piezo fluid sensor? I have found information on a sensor that can be used in any type of fluid. In the specs that I have it is called a "Singing Tube." I can scan the info and send to you if you want it. Arnold achord2@home.com ----- Original Message ----- From: "Gennette, Bruce" To: Sent: Friday, September 21, 2001 12:55 AM Subject: Re: [EE]: Conductive Liquid Sensor > At the bottom of the tank put a stretchy membrane (urethane resists petrol?) > and place 3 micro switches below/beside it (depends on where the hole is, > bottom/lower side of tank). > Put a little fuel in the tank and clamp #1 micro switch so that it is just > open. You have a near empty indicator. > Put more fuel in the tank and clamp #2 micro switch so that it is just open. > You have a part full indicator. > 7/8 fill tank and clamp #3 micro switch so that it is just open. You have a > near full indicator. > > Debounce the switches with a L O N G G G G delay. > > Bye. > > -----Original Message----- > From: Dave VanEe [mailto:dvanee@MECH.UBC.CA] > Sent: Friday, 21 September 2001 15:17 > To: PICLIST@MITVMA.MIT.EDU > Subject: [EE]: Conductive Liquid Sensor > > > 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. > > -- > 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.