Re: Conductivity Sensor

In article <_crve.3416$Qo.1737@fed1read01>,
Luhan Monat <x@xxx> wrote:

> Also, making an 'air core' capacitor using two closely spaced
> insulated plates. Capacitors are known to be sensitive to the
> dielectric used between the plates.

A Co I once worked for used coaxial tubes as a capacitor
for a liquid level sensor, with conductive liquids.

The designer didn't use the change in capacitance though,
he used the change in the tuned circuit losses. In fact
he kept the amplitude constant with an agc loop, and
measured the change in agc voltage.

--
Tony Williams.
.