Apparatus, methods and articles of manufacture to calibrate valve-mounted instruments

Abstract

Example methods, apparatus and articles of manufacture to calibrate valve-mounted instruments, such as a position controllers and/or a position transmitter, are described. An example tangible computer-readable medium comprises instructions that, when executed, cause a machine to receive a first value representative of a current position of a valve, receive a second value representative of a sensitivity of a position sensor, compute a first estimated value corresponding to an expected fully-open position of the valve based on the received first and second values, compute a second estimated value corresponding to an expected fully-closed position of the valve based on the received first and second values, receive a control signal representative of a desired position of the valve, and in response to the received control signal, position the valve at substantially the desired position based on the first and second estimated values.

Dependencies are inferred from the claim text.