Chris Loiacono wrote...

>I have seen commercial dive computers that have no port, tube or =
balloons
>visible, and yet they are amazingly accurate in sensing depth. I have
>searched and phoned sensor makers, foguring that someone must have a
>chip-scale sensing element, but have found nothing of the sort. Has =
anyone
>ever seen what I'm talking about? Know a way to sense pressure or depth
>without porting water or bagging air? This thread has me thinking of
>re-inventing my own rather small wheel...

If they're coupling the pressure sensor to the outside with a fluid, the
port may be extremely small- even a tiny capillary would do.  Maybe it's
there, but hidden or disguised somehow?

You could always rip one apart to see...

Dave

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