Apparatus and method for compensating mass flow rate of a material when the density of the material causes an unacceptable error in flow rate
AssigneeMicro Motion, Inc.
InventorsPaul J. Hays, Andrew T. Patten
Life of this patent
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Abstract
An apparatus and method for determining a density compensated flow rate of a material flowing through a vibrating conduit. Signals are received from sensors affixed to the vibrating conduit. An uncompensated flow rate of said material is then calculated from the signals. A density compensation factor is then determined from the uncompensated flow rate and non-linear information relating density to errors in flow rate. The density compensated flow rate is then determined by applying the density compensation factor to the uncompensated flow rate.
Claims21
A method for determining a density compensated flow rate of a material flowing through a vibrating conduit comprising the steps of:
- receiving signals from sensors affixed to said vibrating conduit;
- calculating an uncompensated flow rate of said material from said signals;
- calculating a density of said material from said signals;
- determining whether said density surpasses a threshold value;
- and
- responsive to said density surpassing said threshold value,
- determining a density compensation factor from said uncompensated flow rate and non-linear information relating said density to errors in flow rate;
- and
- generating said density compensated flow rate by applying said density compensation factor to said uncompensated flow rate.
Meter electronics for a Coriolis flowmeter having a processing unit that provides a density compensated flow rate and comprising:
- instructions for directing said processing unit to:
- receive signals from sensors affixed to a vibrating conduit,
- calculate an uncompensated flow rate of said material from said signals,
- calculate a density of said material from said signals,
- determine whether said density surpasses a threshold value, and
- responsive to said density surpassing said threshold value,
- determine a density compensation factor from said uncompensated flow rate and non-linear information relating said density to errors in flow rate, and
- generate said density compensated flow rate by applying said density compensation factor to said uncompensated flow rate;
- and
- a media readable by said processing unit that stores said instructions.
Dependencies are inferred from the claim text.