By measuring clean water from 3.5†stainless steel pipe, the end user is able to control a pump.  The pump adds water treatment chemicals to the water variably based on the 4-20 output signal controlling it.
First, grease the transducers and clamp on the guide rail base to the pipe.
Move the transducers to the prescribed letter and number as dictated by the electronic head after programming. Release the transducers by removing the spring-loaded screws.
Attach the electronic leads to the the guide rail.
Snap the electronic head to the guide rail. Finished.