Monitoring Light Sensor
An indicator light, electrically or electronically activated, which is positioned in the effluent (product water) stream of a piece of water treatment equipment (deionizer, distiller, reverse osmosis unit, or electrodialysis unit) to detect and signal changes in the water quality which might indicate malfunction of the equipment.
Some lights remain on while water quality is within the desired range and go out if the quality of the water falls into the unacceptable range. Other sensors use red and green light signals.
See Also: Sensor Sensor Sensor