>>Is what you get from a boiled water distiller machine,
>>an insulating fluid?
>>
>>
>>Thanks
>>
>>Or, will a two probe capacitance level sensor
>>work on this product mentioned above?
>>
>>
>
>Possibly. Have a read of this page. Saves me a lot of typing ;-)
>
>http://www.ganoksin.com/orchid/archive/9909/msg00420.htm
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics
>
>
>
>
>

>On 20 Aug 2003 at 22:48, rad0 wrote:
>
> > OK, what I meant to say was:
> >
> > Is what you get from a boiled water distiller machine,
> > an insulating fluid?
> >
> >
> > Thanks
> >
> > Or, will a two probe capacitance level sensor
> > work on this product mentioned above?
>
>Depends what type of capacitive sensor you mean.
>
>The kind that changes frequency due to the dielectric characteristic
>of liquid between two fixed plates may still be OK for detecting
>presence/abcence of pure water.
>
>The other kind that relies on capacitive coupling into a conductive
>liquid to load down an oscillator might be a different story.
>
>--
>Brent Brown, Electronic Design Solutions
>16 English Street, Hamilton, New Zealand
>Ph/fax: +64 7 849 0069
>Mobile/txt: 025 334 069
>eMail:  brent.brownKILLspamclear.net.nz
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics

>On 20 Aug 2003 at 22:48, rad0 wrote:
>
> > OK, what I meant to say was:
> >
> > Is what you get from a boiled water distiller machine,
> > an insulating fluid?
> >
> >
> > Thanks
> >
> > Or, will a two probe capacitance level sensor
> > work on this product mentioned above?
>
>Depends what type of capacitive sensor you mean.
>
>The kind that changes frequency due to the dielectric characteristic
>of liquid between two fixed plates may still be OK for detecting
>presence/abcence of pure water.
>
>The other kind that relies on capacitive coupling into a conductive
>liquid to load down an oscillator might be a different story.
>
>--
>Brent Brown, Electronic Design Solutions
>16 English Street, Hamilton, New Zealand
>Ph/fax: +64 7 849 0069
>Mobile/txt: 025 334 069
>eMail:  EraseMEbrent.brownspam_OUTTakeThisOuTclear.net.nz
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics

>The contamination of the water may also not affect measurement of
>dielectric constant with insulated probes. I made some calibration
>equipment for the oil industry that determines how much water is mixed
>with the oil in a pipeline. A section of pipe had an insulated probe in
>the middle of the pipe (a sort of symmetrical bullet shaped thing that was
>co-axial with the pipe) with a contact outside the pipe. The instrument
>measured the capacity between this probe and the grounded pipe. I don't
>recall how the capacity measurement was actually done (I did the
>calibrator, not the instrument).
>
>Finally, speaking of capacity measurement, I find the capacity measurement
>circuit in many hand held digital meters to be clever. The ones that I've
>looked at have either a Wein Bridge or Twin-T sine wave oscillator driving
>one terminal of the capacitor. The other terminal drives a standard op-amp
>current to voltage converter. The voltage out of the current to voltage
>converter is proportional to the capacity. Real simple! This does,
>however, require the capacitor to be floating.