Patent ID: 7904257
Filing Date: 2011-03-08
Classification: G01F,G05D

Abstract:
1. A flow verification system for verifying a flow rate in a gas piping system comprising: a first cutoff valve; a flow control device installed downstream from the first cutoff valve; a pressure sensor for measuring pressure downstream from the flow control device, the flow verification system being adapted to verify the flow (rate) based on the pressure measured by the pressure sensor; a benchmark storage device for storing a benchmark which is calculated by integrating the pressure values measured by the pressure sensor during a normal operation of the flow control device; an abnormality detection device for detecting an abnormal flow of process gas by integrating the pressure values measured by the pressure sensor to calculate a pressure integrated value and comparing the pressure integrated value with the benchmark when the process gas is supplied to the flow control device through the first cutoff valve, controlled in flow rate by the flow control device, and supplied to the pressure sensor; and a benchmark set mode setting device arranged to cause the pressure sensor to measure the pressure while the flow control device controls flow rate of the process gas when the flow control device is installed in the gas piping system, and cause the benchmark storage device to store, as the benchmark, the pressure integrated value calculated by integration of the measured pressure values.