A couple of days ago someone on the list was asking about sensors for =
picking up the level of a powder in a fill tube - found something in my =
browsing that may fit the bill ....

http://www.qprox.com/products/qt114.php3=20

"The QT114 QLevel* charge-transfer ("QT") sensor IC is specifically =
designed to detect point level in fluids and powders. It will project a =
sense field through almost any dielectric, like glass, plastic, or =
ceramic, to sense level on the inside of a vessel, from its exterior. It =
has the unique capability of independently sensing two trip points when =
used with structured electrodes having two tiers."

Eoin

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