[Phys-L] Re: question about instrument

[betwys1 at SBCGLOBAL.NET (Brian Whatcott)]

At 04:00 PM 8/2/2005, you wrote:
> Perhaps someone can help with this question.  Does anybody know
> anything about a humidity device named "Protimeter PLC digital
> hygrometer"? Or if anyone knows a website with info.  I can find the
> mfg site, but no info on this device.
> James Mackey


There are more than 100 web sources available detailing
Protimeter "digital Hygrometer" devices.
They offer photos and prices, but details of the working
  principle are much harder to find.

I started to suppose a conductimetric method when I read that
  hygroscopic or conductive materials can give false readings,
but I finally read that an RF loop  is held close to a surface
  of interest. I really don't think that a proton spin signal is
  being monitored, but  possibly the damping or frequency pulling
of a (pulsed?) tuned circuit may be involved.


Brian Whatcott    Altus OK    Eureka!