> Anyone know what the diffs are between the AP and GP versions
> of the motorola MPX4250, MPX5700, etc sensors?  The datasheet
> doesn't seem to be too clear on this.  What exactly does "gauge"
> mean on the GP versions and how would the output differ from
> that of the AP versions?

        I believe that refers to the type of sensor. AP is absolute, it reads the
absolute pressure (actually it is differential, it reads the difference in
pressure between what's on it's port and an almost total vaccumm), so if you
had it sitting on a desk it would read about 101kPa (current atmostpheric
pressure). GP is more differential, it gives the DIFFERENCE in pressure
between what's on it's port and the ambient pressure, so if I blew into it
it would show a psoitive reading, sucking it would show a negative reading.

        Minor warning, I'm not familiar with those models but not that the non
temperature compensated models are VERY sensitive to temperature, and must
be compesated by yourself. Even a couple degrees can throw off the reading
quite a bit. Of course if they are temp compensated then ignore my warning.
TTYL

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