Method for generating a diagnostic from a deviation of a flow meter parameter
A method for detecting a deviation in a flow meter parameter of a flow meter that is adapted to measure a fluid flow rate is provided. The method comprises measuring a differential pressure across at least a portion of the flow meter. The method further comprises comparing the measured differential pressure to an expected differential pressure; the expected differential pressure being based on the measured flow rate. The method further comprises detecting a deviation in the flow meter parameter if the difference between the measured differential pressure and the expected differential pressure exceeds a threshold limit.
1. A method for detecting a deviation in a flow meter parameter of a Coriolis flow meter, comprising steps of:
measuring a differential pressure across at least a portion of the Coriolis flow meter;
determining an expected differential pressure based on a known fixed fluid viscosity;
measuring a flow rate with the Coriolis flow meter;
comparing the measured differential pressure to the expected differential pressure based on the measured flow rate; and
detecting a deviation in the flow meter parameter if the difference between the measured differential pressure and the expected differential pressure falls outside of a predetermined threshold limit;
wherein the deviation in the flow meter parameter indicates the presence of a coating in the Coriolis flow meter.
2. The method of claim 1 , further comprising a step of measuring a differential pressure across the entire Coriolis flow meter.
3. The method of claim 1 , wherein the expected differential pressure is obtained from a previously prepared plot of differential pressure v. flow rate.
4. The method of claim 1 , further comprising a step of storing the expected differential pressure in a meter electronics.
5. A method for detecting a deviation in a flow meter parameter of a Coriolis flow meter, comprising steps of:
measuring a differential pressure across the Coriolis flow meter;
measuring a fluid flow rate with the Coriolis flow meter;
calculating an expected fluid flow rate based on the measured differential pressure;
comparing the measured fluid flow rate to the calculated fluid flow rate; and
detecting a deviation in the flow meter parameter if the difference between the measured fluid flow rate and the calculated fluid flow rate exceeds a predetermined threshold limits;
wherein the deviation in the flow meter parameter indicates the presence of a coating in the Coriolis flow meter.
6. The method of claim 5 , further comprising a step of determining a flow meter coefficient.
7. The method of claim 5 , further comprising a step of storing the expected fluid flow rate in meter electronics.