Patent ID: 11920971
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A system comprising:
a gas flowmeter configured for being installed to sense a flow of a gas in a pipe section of a gas pipeline including an outer housing, an inlet and an output, a flow tube coupled to the outlet or to the inlet, with inlet piping coupled to the inlet, and outlet piping coupled to an outlet, and at least one sensor positioned for sensing the gas flowing through the flow tube, a controller including an associated memory communicatively coupled to receive a sensing signal from the sensor, and for controlling operation of the sensor;
wherein at least one of the gas flowmeter further comprises an integrated gas valve connected to the inlet or to the outlet, and an external valve positioned in-line outside the housing coupled to the inlet piping, to provide at least two position operation;
wherein the memory includes flow measurement software, and flow calibration hardware or software run by the controller;
wherein the flow calibration hardware or software is configured to create a zero-flow condition by at least one of closing or bypassing the integrated gas valve or manually closing the external valve, and
the flow measurement software is configured to measure a measured gas flow during the zero-flow condition;
from the measured gas flow, the flow calibration hardware or software is further configured to:
determine a flow offset correction factor;
determine if the flow offset correction factor is different than a predetermined limit, and
if the flow offset correction factor is determined to be different than a predetermined limit, in-line calibrate by adding the flow offset correction factor to the flow measurement algorithm.