阅读说明：本技术 用于电磁流量计的标定装置及电磁流量计 (Calibration device for electromagnetic flowmeter and electromagnetic flowmeter ) 是由 史晓春 于 2019-03-18 设计创作，主要内容包括：本公开提供了一种用于电磁流量计的标定装置及电磁流量计。所述用于电磁流量计的标定装置,其特征在于,包括：流速分段器,其将流体的流速划分为多个区间段；以及标定系数计算器,其针对所述多个区间段中的每个区间段分别计算标定系数。使用根据本公开的用于电磁流量计的标定装置采用分区段多点拟合技术产生标定系数,以对电磁流量传感器进行标定,有利地克服了针对低流速标定系数相差较大的问题。(The disclosure provides a calibration device for an electromagnetic flowmeter and the electromagnetic flowmeter. The calibration device for the electromagnetic flowmeter is characterized by comprising: a flow rate segmenter that divides a flow rate of the fluid into a plurality of segment sections; and a calibration coefficient calculator that calculates a calibration coefficient for each of the plurality of block sections, respectively. The calibration device for the electromagnetic flowmeter disclosed by the invention is used for generating the calibration coefficient by adopting a sectional multipoint fitting technology so as to calibrate the electromagnetic flow sensor, and the problem of large difference of low flow velocity calibration coefficients is favorably overcome.)

1. A calibration arrangement for an electromagnetic flowmeter, comprising:

a flow rate segmenter that divides a flow rate of the fluid into a plurality of segment sections; and

a calibration coefficient calculator that calculates a calibration coefficient for each of the plurality of block sections, respectively.

2. The calibration apparatus as defined in claim 1, further comprising a flow rate selector that selects two or more different flow rates for each of the plurality of segments, respectively.

3. The calibration apparatus as defined in claim 2, wherein the calibration coefficient calculator calculates the calibration coefficient using a linear regression fit based on two or more different flow rates for each of the plurality of segments.

4. The calibration apparatus of claim 1, wherein the flow rate segmenter divides the flow rate of the fluid into a plurality of segments based on a caliber of the electromagnetic flow meter.

5. The calibration device according to any one of claims 1 to 5, wherein the plurality of block sections is two.

6. An electromagnetic flow meter, comprising:

a sensor, and

a calculator that calculates an actual flow rate of the fluid based on an output of the sensor and a calibration coefficient determined for a section of the fluid in which the flow rate is located.

7. The electromagnetic flowmeter of claim 6, wherein said calculator further comprises:

a first calculator that calculates a first flow rate of the fluid based on a calibration coefficient of a reference flow rate of the electromagnetic flowmeter;

a flow rate judger which judges the section of the first flow rate; and

and the second calculator adopts the calibration coefficient corresponding to the section where the first flow rate is positioned to recalculate the actual flow rate of the fluid.

Technical Field

The disclosure relates to the field of flowmeters, in particular to a calibration device for an electromagnetic flowmeter and the electromagnetic flowmeter.

Background

This section provides background information related to the present disclosure, which is not necessarily prior art.

The ideal electromagnetic flow sensor output is linear with the fluid flow rate, but the reality is usually high flow rate, low flow rate repeatability and accuracy are poor, and the lower the flow rate, the worse its behavior is in the form of a bell mouth. The existing calibration process usually adopts two points to carry out linear regression fitting, which causes poor precision when the flow rate is low, even individual flow rate exceeds the precision allowable range and can not pass the calibration. Therefore, the present disclosure provides a new calibration apparatus for an electromagnetic flow meter and an electromagnetic flow meter, so as to solve the above-mentioned drawbacks.

Disclosure of Invention

This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

An object of the present disclosure is to provide a calibration apparatus for an electromagnetic flowmeter, characterized by comprising: a flow rate segmenter that divides a flow rate of the fluid into a plurality of segment sections; and a calibration coefficient calculator that calculates a calibration coefficient for each of the plurality of block sections, respectively.

Preferably, the calibration device according to the present disclosure is characterized by further comprising a flow rate selector that selects two or more different flow rates for each of the plurality of block sections, respectively.

Preferably, the calibration device according to the present disclosure is characterized in that the calibration coefficient calculator calculates the calibration coefficient using a linear regression fit based on two or more different flow rates of each of the plurality of sections.

Preferably, the calibration device according to the present disclosure is characterized in that the flow rate segmenter divides the flow rate of the fluid into a plurality of segment sections based on a bore of the electromagnetic flow meter.

Preferably, the calibration device according to the present disclosure is characterized in that the plurality of block sections is two.

Another object of the present disclosure is to provide an electromagnetic flowmeter, comprising: the flow rate control device comprises a sensor and a calculator, wherein the calculator calculates the actual flow rate of the fluid based on the output of the sensor and a calibration coefficient determined for the section where the flow rate of the fluid is located.

Preferably, the electromagnetic flow meter according to the present disclosure, wherein the calculator further includes: a first calculator that calculates a first flow rate of the fluid based on a calibration coefficient of a reference flow rate of the electromagnetic flowmeter; a flow rate judger which judges the section of the first flow rate; and the second calculator adopts the calibration coefficient corresponding to the section where the first flow rate is positioned to recalculate the actual flow rate of the fluid.

The calibration device for the electromagnetic flowmeter disclosed by the invention is used for generating the calibration coefficient by adopting a sectional multipoint fitting technology so as to calibrate the electromagnetic flow sensor, and the problem of large difference of low flow velocity calibration coefficients is favorably overcome. In other words, the precision at low flow rate is effectively improved by adopting the calibration coefficient based on the flow rate. In addition, the calibration coefficient obtained by adopting multi-point fitting of the subsections is closer to the true value, the error sum of each flow velocity point is minimum, and the precision of the electromagnetic flowmeter is effectively improved.

Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

Drawings

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. In the drawings:

FIG. 1 is a result of a 2 inch caliber electromagnetic flowmeter calibrated using a default calibration factor (10000050).

FIG. 2 shows the results of a linear regression fitting check using two points, 1 fe/s and 3 fe/s.

FIG. 3 shows the results of a linear regression fit check using two points, 6 and 10 feet/s.

FIG. 4 shows a block diagram of a calibration arrangement for an electromagnetic flow meter according to one embodiment of the present disclosure.

FIG. 5 shows a block diagram of a calibration arrangement for an electromagnetic flowmeter according to another embodiment of the present disclosure.

FIG. 6 is a verification result of a calibration apparatus for an electromagnetic flowmeter according to an embodiment of the present disclosure for the electromagnetic flowmeter having a 2-inch caliber as described above, including a regression equation and a straight line obtained by fitting with 1, 3, and 3, 6, 10, and 15, respectively, jet flow data.

FIG. 7 is the results of linear regression fitting based on the flow data of FIG. 6 using 1, 3 and 3, 6, 10, 15, respectively, feet/s flow rate data.

FIG. 8 shows a block diagram of an electromagnetic flow meter according to an embodiment of the present disclosure.

Fig. 9 shows a block diagram of a calculator of an electromagnetic flow meter according to one embodiment of the present disclosure.

While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure. It is noted that throughout the several views, corresponding reference numerals indicate corresponding parts.

Detailed Description

Examples of the present disclosure will now be described more fully with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known structures, and well-known technologies are not described in detail.

Under the condition of certain repeatability of the sensor of the electromagnetic flowmeter, the calibration coefficient directly determines the precision of the electromagnetic flowmeter.

FIG. 1 is a graph of a 2 inch diameter electromagnetic flowmeter calibrated using a default calibration factor (10000050) for 5 runs each at flow rates of about 1, 3, 6, 10 and 15 feet/s. Table 1 below is the corresponding data.

TABLE 1

As can be seen from Table 1, the accuracy deviation is preferable when the flow rate is only 1 feet/s. The deviation of accuracy is less than ideal in the case of flow rates of about 3, 6, 10 and 15, especially in the case of 3, and even outside the range of accuracy allowed, so that calibration cannot be passed.

In addition, in the prior art, calibration takes two flow rate points, e.g., 1feet/s and 10feet/s, runs 5 times each, and then performs linear regression to calculate Gain (Gain) and Offset (Offset). However, at low flow rates, this may also result in poor accuracy of the sensor, failing to pass calibration.

FIG. 2 is the results of a linear regression fit check using two points, 1 and 3, with 5 runs each at flow rates of about 1, 3, 6, 10 and 15, and a calibration factor of 09680059. Table 2 below is the corresponding data.

TABLE 2

As can be seen from Table 2, the accuracy deviation is more preferable when the flow rates are about 1 and 3 feet/s. The deviation in accuracy is less than ideal at flow rates of about 6 and 10feet/s, and in particular at about 15feet/s, almost close to the required limit.

FIG. 3 is the results of a linear regression fit check using two points, 6, and 10, with 5 runs each at flow rates of about 1, 3, 6, 10, and 15, and a calibration factor of 09659066. Table 3 below is the corresponding data.

TABLE 3

As can be seen from Table 3, the accuracy deviation is more desirable and completely meets the requirements when the flow rates are about 3, 6, 10 and 15 feet/s. At a flow rate of about 1feet/s, the accuracy deviation is poor, and the accuracy is beyond the range allowed by the accuracy, so that the calibration cannot be passed.

Therefore, a 2-point calibration mode is adopted, and due to the fact that the electromagnetic flowmeter sensor is not completely linear, the problems that the accuracy of the electromagnetic flowmeter sensor is not high, the accuracy of low flow velocity is poor, and the electromagnetic flowmeter sensor cannot pass through calibration once in a calibration process are caused.

Therefore, the present disclosure provides a new calibration apparatus for an electromagnetic flow meter and an electromagnetic flow meter, so as to solve the above problems.

According to an embodiment of the present disclosure, there is provided a calibration apparatus for an electromagnetic flowmeter, including: a flow rate segmenter that divides a flow rate of the fluid into a plurality of segment sections; and a calibration coefficient calculator that calculates a calibration coefficient for each of the plurality of block sections, respectively.

FIG. 4 shows a block diagram of a calibration arrangement for an electromagnetic flow meter according to one embodiment of the present disclosure.

As shown in fig. 4, the calibration apparatus 100 provided in the present embodiment may include a flow rate segmenter 101 and a calibration coefficient calculator 103.

The flow rate segmenter 101 may divide the flow rate of the fluid into a plurality of segments. According to an embodiment of the present disclosure, the flow rate segmenter 101 may divide the flow rate of the fluid into two segments, for example, bounded by 3feet/s, one segment below 3feet/s, and one segment above 3 feet/s. It should be clear to the skilled person that the two block sections and the flow rate limit of 3feet/s are only exemplary, and the skilled person can of course divide more block sections as desired, and the skilled person can of course set other limits as desired, such as 2.5feet/s, 3.5feet/s, etc.

Next, the calibration coefficient calculator 103 may calculate a calibration coefficient for each of the plurality of block sections, respectively. For example, the calibration coefficient calculator 103 may calculate one calibration coefficient for flow rates below 3feet/s, and the calibration coefficient calculator 103 may calculate one calibration coefficient for flow rates above 3 feet/s.

The calibration device for the electromagnetic flowmeter disclosed by the invention is used for generating the calibration coefficient by adopting a sectional multipoint fitting technology so as to calibrate the electromagnetic flow sensor, and the problem of large difference of low flow velocity calibration coefficients is favorably overcome. That is, by adopting the calibration coefficient based on the flow velocity, the precision at the time of low flow velocity is effectively improved.

According to an embodiment of the present disclosure, the calibration apparatus for an electromagnetic flow meter may further include a flow rate selector that selects two or more different flow rates for each of the plurality of block sections, respectively.

FIG. 5 shows a block diagram of a calibration arrangement for an electromagnetic flowmeter according to one embodiment of the present disclosure.

As shown in fig. 5, the calibration apparatus 200 provided in the present embodiment may further include a flow rate selector 102 in addition to the flow rate segmenter 101 and the calibration coefficient calculator 103.

The flow rate selector 102 may select two or more different flow rates for each of the plurality of block sections, respectively. Taking the flow rate limit of 3feet/s as an example, when the flow rate is below 3feet/s, the flow rate selector 102 can select two flow rate points, such as 1feet/s and 3feet/s, to calculate the calibration coefficient; when the flow rate is above 3feet/s, the flow rate selector 102 can select two flow rate points, e.g., 5feet/s and 10feet/s, for the calculation of the calibration factor. Here, it should be clear to those skilled in the art that the selection of such flow rate points as 1 and 3, and 5 and 10, is merely exemplary, and those skilled in the art can set other flow rate points as desired. Of course, where a flow limit of 3feet/s is included below the limit, it will be clear to those skilled in the art that a flow limit may also be included above the limit.

As described above, the calibration device for an electromagnetic flow meter according to the present disclosure employs a segmented multipoint fitting technique to generate calibration coefficients to calibrate an electromagnetic flow sensor, which advantageously overcomes the problem of large difference in calibration coefficients for low flow velocity.

According to one embodiment of the present disclosure, the calibration coefficient calculator may calculate the calibration coefficient using a linear regression fit based on two or more different flow rates of each of the plurality of segments.

For example, FIG. 6 is a calibration result from the 2 inch diameter electromagnetic flowmeter described above, including regression equations and lines fitted using 1, 3, and 3, 6, 10, and 15, respectively, flow rate data:

1feet/s、3feet/s：y＝96.799x+0.9262

3feet/s、6feet/s、10feet/s、15feet/s：y＝96.524x+1.8796。

then, a new calibration coefficient is calculated according to the equation:

1 fe/s, 3 fe/s: gain 96.80, offset: 5.0+ 0.9262-5.9, the new calibration coefficients are: 09680059.

3, 6, 10, 15, 6, etc.: gain is 96.52, offset is 5.0+1.8796 is 6.9, and new calibration coefficient is 09652069.

FIG. 7 shows the results of linear regression fitting using 1, 3 and 3, 6, 10, and 15, respectively, jet flow data with calibration coefficients of 09680059 and 09652069, respectively. Table 4 below is the corresponding data.

TABLE 4

As can be seen from the above Table 4, the accuracy deviation is good and the accuracy requirement is completely met when the flow rate is about 1, 3, 6, 10 and 15 feet/s.

Here, it should be clear to those skilled in the art that the selection of the above flow rate points is exemplary and the present disclosure is not limited thereto. And errors within a certain reasonable range exist due to actual conditions. For example, 15feet/s, as described in the present disclosure, may be 14.8feet/s or 14.7feet/s in practical measurements, but it should be clear to those skilled in the art that within reasonable error, the present disclosure is referred to as 15 feet/s.

Further, according to an embodiment of the present disclosure, the flow rate segmenter may divide the flow rate of the fluid into a plurality of segment sections based on a caliber of the electromagnetic flow meter. An embodiment according to the present disclosure divides the flow rate of the fluid into two segments (1, 3) and (3, 6, 10, 15) based on a 2 inch bore electromagnetic flowmeter. However, it should be clear to those skilled in the art that the embodiments of the present disclosure are merely exemplary, and the present disclosure is not limited thereto, and those skilled in the art can certainly divide the flow rate of the fluid according to electromagnetic flow meters of different calibers and select different flow rate points for linear regression fitting.

The calibration device for the electromagnetic flowmeter disclosed by the invention is used for generating the calibration coefficient by adopting a sectional multipoint fitting technology, and the problem of large difference of low flow velocity calibration coefficients is favorably solved by calibrating the electromagnetic flow sensor. That is, by adopting the calibration coefficient based on the flow velocity, the precision at the time of low flow velocity is effectively improved. In addition, the calibration coefficient obtained by adopting multi-point fitting of the subsections is closer to the true value, the error sum of each flow velocity point is minimum, and the precision of the electromagnetic flowmeter is effectively improved.

There is also provided, in accordance with an embodiment of the present disclosure, an electromagnetic flow meter, including: the flow rate control device comprises a sensor and a calculator, wherein the calculator calculates the actual flow rate of the fluid based on the output of the sensor and a calibration coefficient determined for the section where the flow rate of the fluid is located.

As shown in fig. 8, the electromagnetic flow meter 300 may include a sensor 301 and a calculator 302.

The calculator 302 may calculate the actual flow rate of the fluid based on the output of the sensor 301 and a calibration coefficient determined for the section of the flow rate of the fluid. The calibration coefficient may be calculated in a manner of calculating the calibration coefficient for each interval as described above, and detailed description of the specific embodiment is omitted here.

According to an embodiment of the present disclosure, there is provided an electromagnetic flow meter, wherein the calculator of the electromagnetic flow meter further includes: a first calculator that calculates a first flow rate of the fluid based on a calibration coefficient of a reference flow rate of the electromagnetic flowmeter; a flow rate judger which judges the section of the first flow rate; and the second calculator adopts the calibration coefficient corresponding to the section where the first flow rate is positioned to recalculate the actual flow rate of the fluid.

According to another embodiment of the present disclosure, there is provided an electromagnetic flow meter, characterized in that a calculator of the electromagnetic flow meter includes: a first calculator that calculates a first flow rate of the fluid based on a calibration coefficient of a reference flow rate section of the electromagnetic flow meter; a flow rate determiner that determines whether the first flow rate belongs to the reference flow rate section; and a second calculator that recalculates the actual flow rate of the fluid based on the calibration coefficient determined for the section in which the first flow rate is located, in a case where the first flow rate does not belong to the reference flow rate section.

Fig. 9 shows a block diagram of a calculator of an electromagnetic flow meter according to one embodiment of the present disclosure.

As shown in fig. 9, the calculator 302 according to the present disclosure may further include a first calculator 3021, a flow rate determiner 3022, and a second calculator 3023.

The first calculator 3021 may calculate the first flow rate of the fluid based on a calibration coefficient of a reference flow rate section of the electromagnetic flow meter. For example, assuming the reference flow rate interval is a flow rate above 3feet/s, the first calculator 3021 may first calculate an initial flow rate of the fluid based on a calibration coefficient for the flow rate above 3 feet/s.

Next, the flow rate determinator 3022 may determine whether the rough flow rate belongs to the reference flow rate segment, i.e., whether the rough flow rate is greater than 3 feet/s.

Then, the second calculator 3023 may recalculate the actual flow rate of the fluid based on the calibration factor determined for the section in which the rough flow rate is located, i.e. the flow rate less than 3feet/s, in case the rough flow rate does not belong to the reference flow rate section, i.e. in case the rough flow rate is not greater than 3 feet/s.

Here, it should be clear to those skilled in the art that the selection of the flow rate section described above is merely exemplary, and the present disclosure is not limited thereto, and those skilled in the art can certainly set different plural sections according to the actual situation. Similarly, the calibration coefficient may be calculated in a manner of calculating the calibration coefficient for each block as described above, and detailed description thereof is omitted here.

By using the electromagnetic flowmeter disclosed by the invention, the overall precision of the electromagnetic flowmeter sensor is effectively improved by adopting a segmented multipoint fitting mode for calibration, and the problem that the small flow easily exceeds the required range is also solved.

Although the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, it should be understood that the above-described embodiments are merely illustrative of the present disclosure and do not constitute a limitation of the present disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made in the above-described embodiments without departing from the spirit and scope of the disclosure. Accordingly, the scope of the disclosure is to be defined only by the claims appended hereto, and by their equivalents.