Hello,

I think the reply from Menno summed it nicely. A few more points to add :

1. As to the selection of pressure and flow transducers the internet is full of resources and I dont think I need give you any brand names. Or if you need specific links - I can directly mail you - the forum may not be the right place.

2. While selecting the output of the transducer ( if the option is there ) then select 4-20mA if the distance from ouput to your instrument if large ( > 10Meters )+ the environment is noisy ; if it is short then a 0-5VDC is esay to handle.

3. Using a dp transmitter to measure flow will generally restrict your final accuracy levels. If your application calls for anything better than 3%, then a direct reading turbine type flow meter is OK. And if it like 0.1% accuracy that you want then your only option is the ( costly ) gear type flowmeters.

4. Finally the ADC resolution - 12 Bits is just the optimum. And you can easliy achieve this with not too much worry on noise threshold like for a 16bit or more. Even when handling 12bits, your target noise threshold should be less than 5mV on the 0-5VDC range. Good grounding and shielding can get you there easily.

Hope the above help.

Bye

Raghunathan