The fixed unit consists of a wall mount electronics package housed in a Nema 4X ( IP65) enclosure and two clamp-on sensors that are permanently clamped to the outside of the pipe. The electronics package offers an easy to read 2-line LCD display with a 16x pushbutton keypad for setting up purposes that utilises a simple menu driven process that makes setting-up very easy and convenient for the operator. A 4-20 mA current loop output as well as pulse and frequency outputs enable the unit to be used for continuous monitoring of flow as well as for totalising and batch operations. The unit is powered from a mains or DC voltage supply.