[Braehill]

Coldman,
It probably doesn't warrant the large price tag of a guided radar indicator, if the level doesn't have to be maintained at an accurate level then there's no need. Steve's assessment is probably right on the money.

Len

[Otto Nobedder]

Len,

Capacitive sensors can be millimeter accurate when the conductance of the medium is constant.

Steve S

[Braehill]

Steve,
I didn't mean to say that they were not well suited for some things, because they are. I was just thinking of their use in boilers and things of that nature that have constant changes in conductivity, we find the higher priced radar units more suitable for them.

Len

[Otto Nobedder]

Fair enough, Len,

I first explored capacitive sensors as a very low power consumption way to montor flow, i.e. the height of water behind a v-notch weir. The idea was to montitor the flow in a cave creek versus the rainfall above. Ultimately, the capacitance method was a "no" because the water itself was conductive, as dissolved calcium ions in a mild carbonic acid solution, and that conductance changed with flow rate, but it was fun learning about all of the above.

Steve S