A.J.,

That pressure sensor measures gauge pressure (0 psi = 1 atm),
not absolute pressure.  Does the voltage actually swing negative
when the pressure drops below atmospheric?  Usually the
pressure gauges I work with will just stop at 0 V.

Mark

>At 04:23 PM 6/4/02 -0400, A.J. Tufgar wrote:
>>To answer pauls questions:
>>1. This is the sensor I'm using from digi-key:  MSP6800-ND
>>2. It's 0-5 psi guage.
>>3. All I need to detect is any negative pressure at all (so very low
>>res.)

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