A plant protection instrumentation equipment, comprises, a sensor that detects a process signal indicating a quantity of a state of a plant, a plurality of A/D converters, each of the A/D converters converts the process signal into a digital signal and outputs a value corresponding to the digital signal,...http://www.google.ca/patents/US7606672?utm_source=gb-gplus-sharePatent US7606672 - Plant protective instrumentation equipment
