This is a reoccurring question related to inline multiphase meters. Here is the answer for the Roxar MPFM 2600.
The Multiphase meter is non-intrusive, except for the venturi and has no moving or static parts limiting the flow area. The sensor electrodes are flush with the inside of the sensor wall and are not subject to erosion. In fact, Roxar has not experienced any installations where erosion has affected the performance of the venturi. Sand has dielectric properties very close to those of oil. Hence, any sand will be measured as a part of the oil. However, as the dielectric measurements are volume based and the volume of sand is typically very small in relation to the total volume of the flow, sand will have virtually no effect on the performance of the meter. Note that Roxar also offers a non-intrusive, acoustic sand monitor that can be integrated with the MPFM in order to detect, measure and quantify produced sand.
Let me know if you have any questions!
-Lars