METHOD OF MEASURING PROCESS VOLUME, MEASURING DEVICE, AND PLANT MONITORING DEVICE

摘要

PROBLEM TO BE SOLVED: To grasp a possible range of a true process value with a high probability and to enable an accurate monitoring of plant operation by sampling at measuring points and also calculating accuracies of measured values changing according to process values and environmental conditions and displaying the measuring values and the accuracies at the same time. SOLUTION: A measured value T1 by a resistance bulb 33 is periodically inputted to a computer device 1 via a process input/output device 2, and is converted into a measured value of the temperature T1 by an engineering value calculation part 11 to store the value in a time-series data storage part 20. At this time, the temperature T2 of the device 2 is also picked up by a temperature sensor 34. An accuracy calculation part 13 calculates an accuracy E1 of a resistance body 33 to the condition T1 and an accuracy E2 of the device 2 to the condition T2, and then calculates an accuracy E3 of the measured value T1 as data in the computer. With respect to an accuracy calculation formula, input points and accuracy calculation formulae corresponding to an operation expression are stored in a calculated specification storage part 14 beforehand. A polygonal line chart plotting part 19 displays on a CRT 4 a polygonal chart showing the measured values and their accuracies in order of time of measurement.