The p2000 is an electrical resistance tomography instrument. The instrument operates by taking data from an array of 16 electrodes in contact with the process media. These are either mounted on a baffle / dip-pipe or around the circumference of the pipe or vessel. These data are processed to provide a conductivity map of the sensing zone. In contrast to many systems-based measurement techniques, tomography sensors are able to rapidly sense throughout a volume. Thus providing a dynamic picture of what is going on inside a pipe or vessel, e.g. whether a system is homogeneous.