Hi Shawn,

If you are measuring air pressure then the tubing will not introduce
error.

The error from wiring will be easy to calculate or measure. And it will
be small to begin with, even with 25 feet of wire.

The sensor is ratiometric so the output span depends on what excitation
voltage is at the sensor itself. You also will have some offset because
of the ground current. But it will not be much error.

Cheerful regards,

Bob


On Tue, Feb 28, 2012, at 01:02 PM, Shawn Donohue wrote:
=20
> I am installing a circuit that measures a small pressure . The=20
> display circuit will be about 25 feet from the source. I am wondering=20
> if it is better to have the transducer as close to the source as=20
> possible and run the wires to the display board or locate the=20
> transducer in the display case and run the 1/4" tubing from the=20
> pressure source to the transducer. I am guessing that I may need to=20
> install a buffer/driver op amp at the source if the transducer is=20
> located there but by moving the transducer, I would cause (I think)=20
> error due to the length of tubing (1/4" plastic).
>=20
> The pressure is in the range of 1-2 psi and the sensor signal is 1-3
> volts.
>=20
> The sensor is similar to this=20
> one =20
> http://search.digikey.com/ca/en/products/MPX5010GP/MPX5010GP-ND/464055

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