Re: toroidal conductivity sensor

hi again
well i was just wondering ,if i use a op-amp for the driver circuit,and
supply 8khz(3v max) can i still get the desired output to mesure
conductivity.And if i can assume that the resistance of the water at
27.7CF in that pipe is of the order of 500 Ohms. The voltage induced
into the water loop will be of the order of 10mV. And so can i now
work out the current and therefore the Ampere turns energising the
pickup coil. From there can estimate the flux and hence the induced
emf per turn of pickup.



If this emf is very small, and small in comparison with noise induced
in the water loop then you may need to consider using a synchronous
rectifier together with a sensitive amp at the pickup.


John Popelish wrote:
> timmy wrote:
> > hi
> > i have attached the picture of the pipe on which the two toroids are
> > mounted.
> > please see
> > thanks
> > rohan http://rapidshare.de/files/4274743/toroid1.doc.html
>
> One other comment: With this sort of arrangement, there is no need to
> have the two toroids right against each other. If it helps to
> eliminate any cross talk between them (any output signal when the
> sample loop is full of air, for example) you can place them anywhere
> around the sample loop. for instance, one may be on the top
> horizontal pipe and one on the bottom horizontal pipe. They need to
> be closely stacked only for the direct immersion application as is
> common with the commercial probes. The important thing is that one
> core induce current in the loop, and the other core measure that loop
> current.

.

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