Sensors like this working in current mode typically need a wetting supply.
The typical implementation to read it will a voltage A/D would be:

pos side of supply --- sensor --- /\/\/\/\ ---- neg side of supply

where /\/\/\/\ is a high precision 250R and the analog input is taken across
the 250R.

Note that a single wetting supply can drive many sensors.

A sensor can drive more than one input if the inputs are isolated, the
wetting supply voltage is high enough, and the sensor has enough compliance.

Bob Ammerman
RAm Systems


----- Original Message -----
From: "Ray Gallant" <rayg@NB.SYMPATICO.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, November 12, 2002 3:08 PM
Subject: [EE] 100Pa low cost presure sensor


> There are some pressure transmitters available but I think they are
> 4-20ma, 0-5volts or 0-10V.  Can get 1-5v by placing a 250R resistor across
> the 4-20ma.  There can be a loading issue with multiple devices.  I don't
> how accurate they would be close to 0 Pa.
> Do a Google on pressure transducer, tons available.
> i.e. http://www.kamstrup-process.com/datashet/3601-1gb.pdf
> {slewrate}
>
> ----- Original Message -----
> From: "Mauricio Jancic" <info@JANSO.COM.AR>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, November 12, 2002 3:31 PM
> Subject: [EE] 100Pa low cost presure sensor
>
>
> > Hi, anybody knows a suplier for a 0 to 100-200 Pa range presure sensor,
> with 0-20mA, 0-5V or anything like that as an output?
>
> --
> http://www.piclist.com hint: To leave the PICList
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>
>

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