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Vibrating element densimeter

Vibrating element densimeter

Vibrating element densimeter

(OP)
Hello there,

I am currently working on a vibrating element densimeter.
Here is the principle: an element is putted at his resonant frequency thanks to a magnetic drive. If this element is imersed in a liquid, the vibration will vary with fluid properties.

In that way I would like to measure a liquid at low pressure (near to atmospheric), temperature of -161°C and density near to 500kg/m3. The viscosity is weak.

I could use a coriolis U tube densimeter which are well known for that, if it was on line mounted. But I need to immerse my sensor in a tank. (no fluid circulation is possible)

Here is the question:
I am wondering which structure of the element could be the best for this work.
A tube ? A tuning fork ? A rod ? ...

I hope you understood well my approximative english and will be happy to see all your ideas,

Many thanks in advance.
 

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