Coplanar vs Inline Pressure Transmitter

Hi Gents

I am trying to understand what is the difference between a coplanar and an inline pressure transmitter? I have to choose one of the two from the Rosemount 3015 Series.

This question is only limited to Gage pressure transmitters. Please ignore differential or absolute transmitters.

My understanding is that inline has only one inlet (no outlet) and sits away from the main flow of the process. But coplanar has an inlet and outlet and sits in the middle of the main flow of the process.

Please share your thoughts. Why would one select one over the other?

Thank you in advance.

Coplanar , inline are different styles of manifolds and how the process is connected to your transmitter.

See link below for more info and descriptions of the above.

http://www2.emersonprocess.com/en-US/brands/rosemount/Pressure/Instrument-Manifolds/Pages/index.aspx

http://www2.emersonprocess.com/EN-U...S/3051-PRESSURE-TRANSMITTERS/Pages/index.aspx

Industrial gauge pressure transmitters are one of two styles:
a) dual head, like a DP, but with a blind head on one side with the 'blind' side internally vented to atmosphere, for a gauge pressure measurement.

(not a Rosemount, but it is functionally a dual head gauge pressure transmitter)



This dual head style could use a 2 valve flange mounted manifold valve:
AG M4TP



b) in-line style, with the process port on the bottom, like bottom connected pressure gauges.




The in-line style is typically piped with a block and bleed valve:



It looks like this when close coupled: 3051T with block and bleed



c) Rosemount's coplanar is the one on the top and right, its in-line model is below and on the left.


The coplanar uses a coplanar manifold valve, unlike all other manifold valves which had been standardized prior to the CoPlanar design.

You can see from the generic diagram below that the coplanar design manifold has a drain/vent (bleed) plug on the manifold (two for DP). That function is accomplished with the block and bleed valve for an in-line style.

Thanks Mickey and Dan, your posts were helpful.