Today, I will introduce a national invention authorized patent-a method and device for determining the zero offset in a vibrating flowmeter. The patent was applied for by Micro Motion, and the authorization was announced on December 28, 2016.
Content descriptionThe present invention relates to a vibrating flow meter, and more particularly, to a method and apparatus for determining a change in the zero point offset of a vibrating flow meter.
Background of the inventionVibration sensors (such as, for example, vibratory densitometers and Coriolis flow meters) are commonly known and are used to measure the mass flow and other information of the substance flowing through the conduit in the flow meter.
Substance flows into the flow meter from the connected pipe on the inlet side of the flow meter, is guided through the conduit(s), and flows out of the flow meter through the outlet side of the flow meter. The natural vibration mode of the vibrating, substance-filled system is determined in part by the combined mass of the conduit and the substance flowing in the conduit. When there is no flow through the flow meter, the driving force applied to the conduit(s) causes all points along the conduit(s) to have a uniform phase or small "zero offset" Vibration, which is the time delay in the zero flow measurement. When the material starts to flow through the flow meter, Coriolis force causes each point along the duct(s) to have a different phase. For example, the phase at the inlet end of the flowmeter lags the phase at the centralized driver location, and the phase at the outlet leads the phase at the centralized driver location. The pick-off sensor on the catheter(s) generates a sinusoidal signal representing the movement of the catheter(s). The signals output from the pick-up sensors are processed to determine the time delay between the pick-up sensors. The time delay between the two or more pickup sensors is proportional to the mass flow rate of the substance flowing through the conduit(s).
In many vibration sensors (including Coriolis flowmeters), the zero offset may exist, and the prior art method initially corrects it. Although this initially determined zero offset can adequately correct the measurement in limited circumstances, due to changes in various operating conditions (mainly temperature), the zero offset may change over time, resulting in only partial Correction. However, other operating conditions may also affect the zero offset, including pressure, fluid density, sensor installation conditions, and so on. In addition, the zero point offset may change at different rates from one flow meter to another. This may be particularly important in situations where more than one flow meter is connected in series, so that if the same fluid flow is being measured, each of the flow meters should read the same. Therefore, there is a need in the art for a method for determining and compensating for the change in the zero point offset of the vibration sensor. The present invention overcomes this and other problems, and achieves progress in the field.
Summary of the inventionAccording to an embodiment of the present invention, a method for operating a vibrating flow meter having a pre-established zero offset and an offset correlation between one or more operating conditions is provided. The method includes the steps of receiving a sensor signal from the vibrating flow meter and determining a current zero point offset for the vibrating flow meter based on the received sensor signal. The method also includes the steps of determining one or more current operating conditions and comparing the one or more current operating conditions with one or more predetermined operating conditions of the offset correlation. According to an embodiment of the present invention, if the offset correlation includes a predetermined zero offset corresponding to the current operating condition, the method generates an average zero point based on the current and predetermined zero offset Offset.
The invention provides a metering electronic device for a vibrating flow meter. The metering electronics includes a processing system configured to receive sensor signals from the vibrating flow meter. The processing system may also be configured to determine a current zero point offset for the vibrating flow meter and determine one or more current operating conditions based on the received sensor signal. According to an embodiment of the present invention, the metering electronic device may also be configured to compare the one or more current operating conditions with one or more pre-set operating conditions of the offset correlation, and if all The offset correlation includes a predetermined zero offset corresponding to the one or more current operating conditions, and an average zero offset is generated based on the current and predetermined zero offset.
According to an aspect of the present invention, a method for operating a vibrating flow meter having a pre-established zero offset and an offset correlation between one or more operating conditions includes the following steps: receiving a sensor signal from the vibrating flow meter ; Determine the current zero offset for the vibrating flowmeter based on the received sensor signal; determine one or more current operating conditions; compare the one or more current operating conditions and the offset to each other Compare one or more predetermined operating conditions of the relationship; and if the offset correlation includes a predetermined zero offset corresponding to the current operating condition, then based on the current and predetermined zero offset Shift produces an average zero offset.
According to another aspect of the present invention, a metering electronic device for a vibrating flow meter includes a processing system configured to: receive a sensor signal from the vibrating flow meter; The current zero point offset of the vibrating flowmeter; determine one or more current operating conditions; compare the one or more current operating conditions with one or more pre-determined operating conditions of the offset correlation; And if the offset correlation includes a predetermined zero offset corresponding to the one or more current operating conditions, an average zero offset is generated based on the current and predetermined zero offset.
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