tmore22,
We bought a water in oil montor from Phase Dynamics for a crude oil metering system. Accuracy is good and cost was less than the alternative.
Full hazardous area approval also.
Goto:
http://www.phasedynamics.com
regards
Justin
adeboy,
I assume you mean Orifice Plate Meter when you refer to the RO? If so are you metering gas? If so is it indicative or is it fiscal metering?
Maybe I'm barking up the wrong tree but if it is fiscal gas metering you should look in your project nominated standards, if it mentions ISO 5167...