Applications of time domain reflectometry in process control

Describes a fluid level sensor which provides a new approach to fluid level measurement. It has no moving parts, requires no maintenance, the sensing element can be easily manufactured and it is capable of measuring more than one fluid level and fluid levels in the presence of contaminants. The control electronics can be remote from the sensing element and the output from the control electronics can be either digital or analogue. One electronics unit can be designed to service many sensing elements and, since most of the cost resides in the electronics, this considerably reduces the cost per sensor. This sensor can be readily integrated into a process control system and provide continuous information on fluid levels in many vessels