Sartrex - Poison Tank Ball Position Detector - Brochure

The Sartrex Poison Tank Ball Position Detector uses a photoconductive cell detection system to monitor the level of fluid in liquid poison tanks of the Liquid Injection Shutdown System. The tanks contain high purity, oxygen tree heavy water that is light straw in colour. Two light emitting diodes are screwed into the sides of the tanks, directly opposite each other. Normally a polyethylene ball, floating on the fluid, blocks the optical link between the two units. If the ball drops low enough, the photo-transistor in unit two sees the radiant output from unit one and triggers the alarm. A power failure can also trigger the alarm condition.