Hi Dan,
Assuming that you are looking for a pressure transducer (I'm not familiar with "transmitter" name), I'll suggest PX971 from Omega. It's a piece of equipment and it seems to be exactly what you are looking for.
You can find a short description here [http://www.omega.com/ppt/pptsc.asp?ref=PX971&Nav=prew01] or complete specs [http://www.omega.com/Pressure/pdf/PX971.pdf].
Anyway, take a look to their entire presure related product line.
Hope this helps.