Patent ID: 9644796
Date: 2017-05-09
CPC Classifications: F17D,G01F,G05D,Y10T

Claim:
1. A method of in-situ calibration of a flow controller coupled to a process chamber, comprising: providing a flow controller that is configured to provide a first gas at a first value of a flow rate when set to a first value of a setpoint based on a calculated first relationship determined by using a standard gas that is different from the first gas; determining an actual first relationship between the flow rate and the setpoint for the first gas from a plurality of different values of the flow rate of the first gas determined at a corresponding plurality of different values of the setpoint of the flow controller, wherein each of the plurality of values of the flow rate is determined from flowing the first gas through the flow controller at corresponding ones of the plurality of values for the setpoint; and flowing the first gas at the first value of the flow rate from the flow controller into the process chamber, based on the actual first relationship.