Flow meter and coriolis mass flow meter transmitter based on multi-channel temperature acquisition

Abstract

The application relates to a flowmeter and a Coriolis mass flowmeter transmitter based on multi-channel temperature acquisition, which comprises a multi-channel temperature acquisition module for acquiring temperature data at different positions of the flowmeter; an analog-digital conversion module for converting the temperature data acquired by the temperature acquisition module into digital data; a low-pass filter arranged between each temperature acquisition module and the analog-digital conversion module for filtering high-frequency signals in the acquired temperature data; each temperature acquisition module comprises a temperature acquisition element and two or three measuring lines connected with the temperature acquisition element, the temperature data acquired by the temperature acquisition module with the two measuring lines are used as compensation data of temperature density; and the temperature data acquired by the temperature acquisition module with the three measuring lines are used as measured temperature data. The transmitter compensates the density by using the temperature data acquired by the multi-channel temperature acquisition module, so that the density accuracy of the flowmeter is improved, and the density measurement accuracy of the flowmeter is improved by one level.

Description

Technical Field

[0001] This application belongs to the field of flow meter technology, and particularly relates to a flow meter and a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition. Background Technology

[0002] Traditional Coriolis mass flow meters are equipped with a single temperature acquisition channel, which is used for compensation of measurements such as flow rate and density. This temperature sensor is attached to the inlet end of the flow meter's measuring tube. Traditional Coriolis mass flow meters using single-channel temperature compensation suffer from low measurement accuracy, which cannot meet the accuracy requirements of modern users. Utility Model Content

[0003] One embodiment of this application provides a flow meter and a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition to solve the problem of low measurement accuracy caused by traditional flow meters using single-channel temperature to compensate for measurement data.

[0004] In a first aspect, one embodiment of this application provides a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition, comprising:

[0005] A multi-channel temperature acquisition module is used to collect temperature data from different locations on the flow meter;

[0006] An analog-to-digital conversion module is connected to each of the temperature acquisition modules, and the analog-to-digital conversion module is used to convert the temperature data acquired by the temperature acquisition modules into digital data.

[0007] Each temperature acquisition module is connected to the analog-to-digital conversion module with a low-pass filter for filtering high-frequency signals in the acquired temperature data. Each temperature acquisition module includes a temperature acquisition element and two or three measurement lines connected to the temperature acquisition element. The temperature data acquired by the temperature acquisition module with two measurement lines is used as compensation data for temperature density; the temperature data acquired by the temperature acquisition module with three measurement lines is used as measured temperature data.

[0008] Optionally, the multi-channel temperature acquisition module can be a three-channel temperature acquisition module, referred to as the first temperature acquisition module, the second temperature acquisition module, and the third temperature acquisition module. The first temperature acquisition module is located at the measurement inlet of the flow meter, the second temperature acquisition module is located at the measurement outlet of the flow meter, and the third temperature acquisition module is located on the outer casing of the flow meter.

[0009] Optionally, the multi-channel temperature acquisition module is a four-channel temperature acquisition module, referred to as the first temperature acquisition module, the second temperature acquisition module, the third temperature acquisition module, and the fourth temperature acquisition module. The first temperature acquisition module is located at the measurement inlet of the flow meter, the second temperature acquisition module is located at the measurement outlet of the flow meter, the third temperature acquisition module is located on one side of the flow meter housing, and the fourth temperature acquisition module is located on the other side of the flow meter housing.

[0010] Optionally, the low-pass filter includes a filter resistor, a first filter capacitor, and a second filter capacitor. The input end of each measurement line is connected to the temperature acquisition element, the output end of each measurement line is connected to the first end of the filter resistor, the second end of the filter resistor is connected to the first end of the first filter capacitor, the first end of the second filter capacitor, and the input end of the analog-to-digital conversion module, respectively, the second end of the first filter capacitor is connected to the second end of the filter resistor in another measurement line, and the second end of the second filter capacitor is grounded.

[0011] Optionally, the filter resistor is 4.99KΩ.

[0012] Optionally, the first filter capacitor is 47nF and the second filter capacitor is 4.7nF.

[0013] Optionally, the temperature acquisition element is a temperature sensor.

[0014] Optionally, the analog-to-digital conversion module includes an AD analog-to-digital converter.

[0015] Optionally, each of the temperature acquisition modules further includes a resistor connected to the temperature acquisition element, and the resistor is also connected to the analog-to-digital conversion module. The resistor is used to obtain a reference voltage for the acquired data.

[0016] Secondly, one embodiment of this application provides a flow meter, including the Coriolis mass flow meter transmitter based on multi-channel temperature acquisition as described above.

[0017] One embodiment of this application provides a flow meter and a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition includes a multi-channel temperature acquisition module for acquiring temperature data at different locations of the flow meter; an analog-to-digital conversion module connected to each temperature acquisition module, which converts the temperature data acquired by the temperature acquisition modules into digital data; wherein, a low-pass filter is provided between each temperature acquisition module and the analog-to-digital conversion module to filter high-frequency signals in the acquired temperature data; each temperature acquisition module includes a temperature acquisition element and two or three measurement lines connected to the temperature acquisition element; the temperature data acquired by the temperature acquisition module with two measurement lines is used as temperature density compensation data; the temperature data acquired by the temperature acquisition module with three measurement lines is used as measured temperature data. This Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is used in flow meters. By using temperature data collected by the multi-channel temperature acquisition module, the density is compensated, thereby improving the density accuracy of the flow meter. This improves the density measurement accuracy of the flow meter by one level, solving the problem of low measurement accuracy caused by traditional flow meters that use single-channel temperature to compensate for measurement data.

[0018] This flow meter achieves high-precision flow measurement through a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition. Attached Figure Description

[0019] To more clearly illustrate the technical solution in one embodiment of this application, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0021] Figure 1 A schematic diagram of the frame of a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is provided for one embodiment of this application.

[0022] Figure 2 A circuit diagram of a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is provided for one embodiment of this application.

[0023] Figure 3 The circuit diagram of each temperature acquisition module in a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is provided for one embodiment of this application. Detailed Implementation

[0024] The technical solution of one embodiment of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] One embodiment of this application provides a flow meter and a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition to solve the problem of low measurement accuracy caused by traditional flow meters using single-channel temperature to compensate for measurement data.

[0026] Example 1:

[0027] One embodiment of this application provides a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition. For an example, please refer to [link to relevant documentation]. Figure 1 , Figure 1 The circuit diagram of the three-channel temperature acquisition module in a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is provided for one embodiment of this application. Figure 2 A circuit diagram of a four-channel temperature acquisition module in a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition, provided as an embodiment of this application.

[0028] like Figure 1 and Figure 2 As shown, this utility model application provides a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition, including an analog-to-digital conversion module and a multi-channel temperature acquisition module.

[0029] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, a multi-channel temperature acquisition module is used to acquire temperature data at different locations of the flow meter, and the temperature data from each channel compensates for the density accuracy of the flow meter.

[0030] Furthermore, this Coriolis mass flow meter transmitter, based on multi-channel temperature acquisition, uses temperature data collected by the multi-channel temperature acquisition module to compensate for density, thereby improving the flow meter's density accuracy to ±0.5 kg / m³ or ±0.2 kg / m³. This represents a significant improvement in the flow meter's density measurement accuracy.

[0031] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, the analog-to-digital conversion module U10 is connected to each temperature acquisition module. The analog-to-digital conversion module is used to convert the temperature data acquired by the temperature acquisition module into digital data for easy use.

[0032] To further clarify, the analog-to-digital conversion module includes an A / D converter. The A / D converter can be selected as the ADS1248 model.

[0033] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, a low-pass filter 10 for filtering high-frequency signals in the acquired temperature data is provided between each temperature acquisition module and the analog-to-digital conversion module. Each temperature acquisition module includes a temperature acquisition element RTD and two or three measurement lines connected to the temperature acquisition element. The temperature data acquired by the temperature acquisition module with two measurement lines is used as compensation data for temperature density; the temperature data acquired by the temperature acquisition module with three measurement lines is used as measured temperature data.

[0034] To further explain, such as Figure 1 and Figure 2 As shown, the temperature acquisition element RTD can be selected as a temperature sensor. In this embodiment, a three-line temperature sensor RTD is used for accurate temperature measurement. A two-line temperature sensor RTD is used for temperature density compensation. The low-pass filter 10 is used to filter out high-frequency interference signals in the temperature data acquired by the temperature acquisition module.

[0035] One embodiment of this application provides a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition, including a multi-channel temperature acquisition module for acquiring temperature data at different locations on the flow meter; and an analog-to-digital conversion module connected to each temperature acquisition module, which converts the temperature data acquired by the temperature acquisition modules into digital data. A low-pass filter is provided between each temperature acquisition module and the analog-to-digital conversion module to filter high-frequency signals in the acquired temperature data. Each temperature acquisition module includes a temperature acquisition element and two or three measurement lines connected to the temperature acquisition element. The temperature data acquired by the temperature acquisition module with two measurement lines is used as temperature density compensation data; the temperature data acquired by the temperature acquisition module with three measurement lines is used as measured temperature data. This Coriolis mass flow meter transmitter based on multi-channel temperature acquisition compensates for density using temperature data acquired by multiple temperature acquisition modules, thereby improving the density accuracy of the flow meter and achieving a one-level improvement in density measurement accuracy. This solves the problem of low measurement accuracy caused by traditional flow meters using single-channel temperature compensation.

[0036] like Figure 1As shown, in one embodiment of the present invention, the multi-channel temperature acquisition module is a three-channel temperature acquisition module, referred to as the first temperature acquisition module, the second temperature acquisition module, and the third temperature acquisition module. The first temperature acquisition module is located at the measurement inlet of the flow meter, the second temperature acquisition module is located at the measurement outlet of the flow meter, and the third temperature acquisition module is located on the outer casing of the flow meter.

[0037] To further clarify, the three temperature acquisition modules are designated as the first temperature acquisition module RTD1, the second temperature acquisition module RTD2, and the third temperature acquisition module RTD3. In this embodiment, the first temperature acquisition module RTD1 and the second temperature acquisition module RTD2 are respectively attached to the measurement inlet and measurement outlet of the flowmeter to compensate for density when there is a temperature difference between the two ends (inlet and outlet) of the measuring tube in the flowmeter. The third temperature acquisition module RTD3 is attached to the outer casing of the flowmeter.

[0038] like Figure 2 As shown in the embodiment of this utility model, the multi-channel temperature acquisition module is a four-channel temperature acquisition module, which is referred to as the first temperature acquisition module, the second temperature acquisition module, the third temperature acquisition module, and the fourth temperature acquisition module. The first temperature acquisition module is set at the measurement inlet of the flow meter, the second temperature acquisition module is set at the measurement outlet of the flow meter, the third temperature acquisition module is set on one side of the flow meter housing, and the fourth temperature acquisition module is set on the other side of the flow meter housing.

[0039] To further explain, such as Figure 2 As shown, the four temperature acquisition modules are designated as the first temperature acquisition module RTD1, the second temperature acquisition module RTD2, the third temperature acquisition module RTD3, and the fourth temperature acquisition module RTD4. In this embodiment, the first and second temperature acquisition modules RTD1 and RTD2 are respectively attached to the measurement inlet and outlet of the flowmeter to compensate for density differences when there is a temperature difference between the two ends (inlet and outlet) of the measuring tube in the flowmeter. The third temperature acquisition module RTD3 is attached to the outer casing of the flowmeter. The fourth temperature acquisition module RTD4 is attached to the other side of the flowmeter casing to compensate for the influence of the difference between the ambient temperature and the temperature of the measuring tube in the flowmeter on the accuracy of density.

[0040] Figure 3 The circuit diagram of each temperature acquisition module in a Coriolis mass flow meter transmitter based on multi-channel temperature acquisition is provided for one embodiment of this application.

[0041] like Figure 3 As shown, in one embodiment of this utility model, the low-pass filter 10 includes a filter resistor, a first filter capacitor, and a second filter capacitor. The input terminal of each measurement line is connected to the temperature acquisition element R.RTD The connection is as follows: the output end of each measurement line is connected to the first end of the filter resistor; the second end of the filter resistor is connected to the first end of the first filter capacitor, the first end of the second filter capacitor, and the input end of the analog-to-digital converter module, respectively; the second end of the first filter capacitor is connected to the second end of the filter resistor in another measurement line; and the second end of the second filter capacitor is grounded.

[0042] To further clarify, the filter resistor can be selected as 4.99KΩ. The first filter capacitor can be selected as 47nF, and the second filter capacitor can be selected as 4.7nF.

[0043] In embodiments of this utility model application, each temperature acquisition module further includes a temperature acquisition element R. RTD Connected resistor R REF resistor R REF It also connects to the analog-to-digital converter module, resistor R REF The reference voltage used to obtain the acquired data eliminates all series resistances that contribute to the measurement error of the reference resistance, thereby improving the accuracy of the measurement data of this Coriolis mass flow meter transmitter based on multi-channel temperature acquisition.

[0044] In the embodiments of the utility model of this application, such as Figure 3 As shown, the working principle of each temperature acquisition module is as follows: the excitation current flows into the first measurement line Lead1 of the temperature acquisition element RTD, through the temperature acquisition element RTD, and then out through the third measurement line Lead3. Ignoring the measurement line resistance error, the measurement from pin AIN1 to pin AIN2 connected to the first measurement line Lead1 only measures the resistance of the temperature acquisition element RTD. If the excitation current source is selected as 1mA, this maximizes the voltage value of the temperature acquisition element RTD while minimizing its self-heating. For small thin-film elements, the typical range of the self-heating coefficient of the temperature acquisition element RTD is 2.5mW / ℃, and for larger wire-wound elements, this range is 65mW / ℃. At the maximum resistance value of the temperature acquisition element RTD, with an excitation current of 1mA, the power consumption in the temperature acquisition element RTD is less than 0.4mW, and the measurement error caused by self-heating is kept within 0.01℃. After selecting the input current, the resistance value R of the current transformer is set. REF =1620Ω. This sets the reference voltage to 1.62V, and the voltage of the maximum temperature acquisition element RTD to 400mV. The reference voltage acts as a level shifter to bring the input measurement close to the midpoint voltage, thus placing the measurement within the operating range of the pin array package PGA input of the analog-to-digital converter module. Using these values, the pin array package PGA gain of the analog-to-digital converter module can be set to 4 so that the voltage of the maximum temperature acquisition element RTD is close to but does not exceed its positive full-scale range. Resistor R REFIt must be a precision resistor with high accuracy and low drift. Resistor R REF Any error in this measurement reflects the same error in the temperature acquisition element RTD. The REFP0 and REFN0 pins shown are connected as Kelvin to resistor R. REF Connect them to obtain the best reference voltage measurement, which eliminates all series resistance as a source of measurement error for the reference resistor.

[0045] Example 2:

[0046] This utility model application provides a flow meter, including the aforementioned Coriolis mass flow meter transmitter based on multi-channel temperature acquisition.

[0047] It should be noted that the content of the Coriolis mass flow meter transmitter based on multi-channel temperature acquisition in this embodiment has been described in Embodiment 1, and the specific content of the Coriolis mass flow meter transmitter based on multi-channel temperature acquisition will not be described again in this embodiment.

[0048] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0049] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0050] The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition provided in one embodiment of this application has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A Coriolis mass flow meter transmitter based on multi-channel temperature acquisition, characterized in that, include: A multi-channel temperature acquisition module is used to collect temperature data from different locations on the flow meter; An analog-to-digital conversion module is connected to each of the temperature acquisition modules, and the analog-to-digital conversion module is used to convert the temperature data acquired by the temperature acquisition modules into digital data. Each temperature acquisition module is connected to the analog-to-digital conversion module with a low-pass filter for filtering high-frequency signals in the acquired temperature data. Each temperature acquisition module includes a temperature acquisition element and two or three measurement lines connected to the temperature acquisition element. The temperature data acquired by the temperature acquisition module with two measurement lines is used as compensation data for temperature density; the temperature data acquired by the temperature acquisition module with three measurement lines is used as measured temperature data.

2. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to claim 1, characterized in that, The multi-channel temperature acquisition module is actually a three-channel temperature acquisition module, referred to as the first temperature acquisition module, the second temperature acquisition module, and the third temperature acquisition module. The first temperature acquisition module is located at the measurement inlet of the flow meter, the second temperature acquisition module is located at the measurement outlet of the flow meter, and the third temperature acquisition module is located on the outer casing of the flow meter.

3. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to claim 1, characterized in that, The multi-channel temperature acquisition module is actually a four-channel temperature acquisition module, referred to as the first temperature acquisition module, the second temperature acquisition module, the third temperature acquisition module, and the fourth temperature acquisition module. The first temperature acquisition module is located at the measurement inlet of the flow meter, the second temperature acquisition module is located at the measurement outlet of the flow meter, the third temperature acquisition module is located on one side of the flow meter housing, and the fourth temperature acquisition module is located on the other side of the flow meter housing.

4. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to any one of claims 1-3, characterized in that, The low-pass filter includes a filter resistor, a first filter capacitor, and a second filter capacitor. The input end of each measurement line is connected to the temperature acquisition element, and the output end of each measurement line is connected to the first end of the filter resistor. The second end of the filter resistor is connected to the first end of the first filter capacitor, the first end of the second filter capacitor, and the input end of the analog-to-digital conversion module, respectively. The second end of the first filter capacitor is connected to the second end of the filter resistor in another measurement line, and the second end of the second filter capacitor is grounded.

5. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to claim 4, characterized in that, The filter resistor is 4.99KΩ.

6. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to claim 4, characterized in that, The first filter capacitor is 47nF, and the second filter capacitor is 4.7nF.

7. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to any one of claims 1-3, characterized in that, The temperature acquisition element is a temperature sensor.

8. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to any one of claims 1-3, characterized in that, The analog-to-digital conversion module includes an AD analog-to-digital converter.

9. The Coriolis mass flow meter transmitter based on multi-channel temperature acquisition according to any one of claims 1-3, characterized in that, Each of the temperature acquisition modules further includes a resistor connected to the temperature acquisition element, and the resistor is also connected to the analog-to-digital conversion module. The resistor is used to obtain a reference voltage for the acquired data.

10. A flow meter, characterized in that, Including the Coriolis mass flow meter transmitter based on multi-channel temperature acquisition as described in any one of claims 1-9.

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