An intelligent control system for plugging indicator has been developed and successfully implemented to measure the impurities level in liquid sodium. A firing angle based silicon controlled rectifier (SCR) power controller (phase angle) based method has been adopted to vary the speed of the plugging indicator (PI) blower to do the automation along with application software written in Turbo C 3.0. On execution of this software, control system finds the plugging temperature corectorsponding to 80% of normal flow of the sodium and deduced the impurities in sodium using the mathematical relations. This integrated control system supports both continuous as well as discontinuous mode of operation.

Key words : Breeder reactor, DACs, phase angle