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Subject: Re: Fuel Tank Sender Drive/Read Circuit?
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Date: Thu, 31 Oct 2002 11:55:59 GMT
NNTP-Posting-Date: Thu, 31 Oct 2002 06:55:59 EST
Organization: RoadRunner - Tampa Bay
Shouldn't he be more worried about static electricity? My aftermarket fuel
cell came with a ground strap.
Bob Wilson wrote in message
> In article <firstname.lastname@example.org>,
> email@example.com says...
> >I am trying to read a potentiometer
> > based fuel tank sender with a microcontroller
> > and have seen a warning to not exceed 0.25Volts
> >and 0.25Amps to the sender. This warning is to limit
> >the amount of energy to the sender inside the tank for
> >ignition/explosion protection.
> >Are there any circuits available to meet this requirement?
> >Is there any place/source I could go to get more info on
> >this type of circuit?
> The warning is semi-bogus. 0.25V at 0.25A is only 1/16th of a Watt!
> Highly unlikely to trigger anything. Besides, the "atmosphere" inside a
> tank is FAR to rich to support any combustion. Beyond a certain percentage
> of gasoline-to-air ratio, there's no way it will ignite.
> You haven't stated what the pot's resistance is, but I'll bet that it is
> far too high to allow anything remotely close to 0.25A to flow when only
> volt is applied.
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