Patent ID: 11860018
Assignee: HORIBA STEC, CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method for use with a rate-of-change flow measurement device comprising a block body having a flow path, a chamber comprising a part of the flow path of the block body, a position control valve comprising an actuator, a valve position sensor configured to measure a valve position of the actuator of the position control valve, an isolation valve configured to seal the chamber, a first pressure sensor located on a first side of the flow path from the position control valve and configured to detect a first pressure at the first side of the flow path, and a second pressure sensor located on a second side of the flow path from the position control valve and configured to detect a second pressure at the second side of the flow path adjacent the chamber, the method to perform a rate-of-rise (ROR) measurement comprising:
installing the rate-of-change flow measurement device downstream of a device-under-test (DUT) so that the DUT is on the first side of the flow path;
setting a pressure set point for the position control valve;
opening the isolation valve and controlling the position control valve to control the pressure at the first pressure sensor to stay at the pressure set point;
upon stabilizing pressure readings of the first pressure sensor and the second pressure sensor, closing the isolation valve;
collecting actuator position data of the position control valve while gradually opening the position control valve to maintain the pressure reading of the first pressure sensor constant until the position control valve is fully opened;
calculating a volume of the chamber based on the actuator position data of the position control valve;
calculating a pressure differential based on pressure readings from a time when the isolation valve is closed until the position control valve is fully opened;
calculating a flow rate based on the calculated volume of the chamber and the pressure differential; and
outputting the flow rate for display or for downstream processing.