Abstract
We developed a monitoring system which enables monitor of plant equipment at low cost without construction of new signal cables. This system transmits the CCD camera image and wireless sensor data, which are vibration, and hand-operated valve position using established signal cables. This system uses a limit switch cable which detects opening and closing of a motor operated valve (MOV) and superimposes the CCD camera image and the wireless sensor data on the voltage signal of the signal cable of MOV by modulating these monitoring signals. The monitoring signal is separated with the voltage signal, and is demodulated and is displayed as the image and vibration data. It was clarified that this system can transmit the monitoring signal without influencing detection of opening and closing of MOV.
