There aren't many sensors optimized for Barometry and, the few I've seen are
very expensive. Any pressure sensor rated for 0-15psia (a=absolute) will
work OK.

SenSym has a good selection http://www.pressure.invensys.com/. Fujikara and
Motorola also have good units.

Not sure about the H1 designation from Phillips. The only Phillips %RH
sensor I've seen is part# 2322-691-90001 also referred to as the Series 691
Relative Humidity Sensor. It works well but is for indoor use only. It's
primarily intended for use in humidifiers and clothes dryers for automatic
shutoff. Phillips had it in their 1990-91 resistor/capacitor data book in
the non-linear resistor section. We used it in a design and the purchasing
guys nearly went nuts trying to find it because the vast majority of
Phillips salespeople and engineers didn't even know it existed.

Paul

> That reminds me of something I've been meaning to ask. What kind of
> sensor would one use to measure barometric pressure electronically?
> I've seen "pressure sensors" that only measure a few PSI, but never
> something that is optimized for collecting weather data. Surely there
> is such a thing?
>
> And on a similar topic, I'm interested in the Philips H1 humidity
> sensor, but I can't find a source (even a price) for it. Part of
> the problem is the name "H1" is too short for some of the search
> engines (e.g. findchips.com). Thanks in advance for any help!

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