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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Oil level gauge
On Sat, 15 Feb 1997, Hydee wrote: > Hi all, > Could you replace the dipstick with some sort of capacitive proximity > sensor type doo-dah thingummy..... > > > I've given this some thought and did a LITTLE research. Can't find > > anything off the shelf but the idea of sensors on the dipstick > > sounds intriguing. My limited electrical experience tells me that > > some small thermistors mounted at intervals along the dipstick and > > connected to a few op-amps would do the job. The output could be a <snip> To everyone with dreams of a great product that will fully fund their retirement account: The idea of using thermistors (yes, that is a valid name for a real device) along the dipstick, or any other type of electrical device INSIDE the crankcase means that the device needs to be intrinsically safe (voltage and current so low that it can not generate a spark), or explosion proof (not very practical for autos), since it would be exposed to the crankcase atmosphere, which can be flammable/explosive. If you have never designed instrumentation for hazardous environments, you probably want to leave this one alone. Both you and your cat could live longer. And product liability lawyers will hate you for not doing it! Larry Lee, P.E. Auburn, AL, USA Follow-Ups:
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