CN115144057A - System and method for zero point calibration and mass flow meter - Google Patents
System and method for zero point calibration and mass flow meter Download PDFInfo
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- CN115144057A CN115144057A CN202110348305.1A CN202110348305A CN115144057A CN 115144057 A CN115144057 A CN 115144057A CN 202110348305 A CN202110348305 A CN 202110348305A CN 115144057 A CN115144057 A CN 115144057A
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 239000003949 liquefied natural gas Substances 0.000 claims description 47
- 238000004891 communication Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000003860 storage Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
Abstract
A system and method for zero calibration and a mass flow meter are disclosed. The system comprises: the mass flow meter to be calibrated is connected in series with the pipeline, and the mass flow of the fluid in the pipeline is measured to be used as the mass flow to be calibrated; a standard mass flow meter connected in series to the pipe and measuring a mass flow of the fluid in the pipe as a standard mass flow; and the computer is respectively connected to the mass flowmeter to be calibrated and the standard mass flowmeter, receives information about standard mass flow from the standard mass flowmeter as standard mass flow information, and sends the standard mass flow information to the mass flowmeter to be calibrated, wherein the mass flowmeter to be calibrated receives the standard mass flow information from the computer, and the mass flowmeter to be calibrated comprises a zero calibration unit which calculates new zero points based on the mass flow to be calibrated and the standard mass flow information so as to perform zero calibration on the mass flowmeter to be calibrated.
Description
Technical Field
The invention relates to a system and a method for zero point calibration and a mass flowmeter.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Mass flowmeters are widely used in industrial applications to measure the mass flow of a fluid in a pipeline. Zero calibration of a mass flow meter is typically required before the mass flow meter is used to measure the mass flow of a fluid in a pipe. However, in the prior art, the mass flowmeter usually needs to be manually zero-calibrated for many times to ensure the accuracy of flow measurement.
For example, in a Liquefied Natural Gas (LNG) application, with the release and implementation of LNG fueling station regulations, LNG gauges are required to guarantee an accuracy of ± 2.5% in the flow range of 10 to 20 kg/min. At present, when an OEM manufacturer of an LNG dispenser performs LN2 standard meter test, about 20 percent of LNG meters can not pass the requirement of guaranteeing the precision of +/-2.5 percent within the flow range of 10-20 kg/min at one time. The OEM customer needs to adjust the MF value of the dispenser (similar to the meter coefficient) to adjust the read flow value and then repeat the LN2 standard meter test until the test passes. Customers have also returned to the plant some LNG tables that have not been able to meet the requirements (accuracy of ± 2.5% is guaranteed in the flow range of 10-20 kg/min) after several rounds of testing. This brings great trouble to the customer, influences customer's production efficiency.
Therefore, it is necessary to realize intelligent dynamic zero calibration of the mass flow meter, so as to ensure the one-time pass rate of the LN2 standard meter test and improve the performance of the product.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood, however, that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.
In view of the above, it is an object of the present invention to provide a system and method for zero point calibration and a mass flow meter.
According to an aspect of the present invention, there is provided a system for zero point calibration, comprising: the mass flow meter to be calibrated is connected to a pipeline in series and measures the mass flow of the fluid in the pipeline as the mass flow to be calibrated; a proof mass flow meter configured to be connected in series on the pipe and to measure a mass flow rate of a fluid in the pipe as a proof mass flow rate; and a computer configured to be connected to the mass flow meter to be calibrated and the standard mass flow meter respectively, receive information about the standard mass flow from the standard mass flow meter as standard mass flow information, and send the standard mass flow information to the mass flow meter to be calibrated, wherein the mass flow meter to be calibrated is further configured to receive the standard mass flow information from the computer, and wherein the mass flow meter to be calibrated includes a zero calibration unit configured to calculate a new zero based on the mass flow to be calibrated and the standard mass flow information to zero calibrate the mass flow meter to be calibrated.
According to another aspect of the present invention, there is provided a system for zero point calibration, comprising: the mass flow meter to be calibrated is connected to a pipeline in series and measures the mass flow of the fluid in the pipeline as the mass flow to be calibrated; a proof mass flow meter configured to be connected in series on the pipe and to measure a mass flow rate of a fluid in the pipe as a proof mass flow rate; the first transmitter is configured to be connected to the mass flowmeter to be calibrated and form a polling host together with the mass flowmeter to be calibrated; and a second transmitter configured to be connected to the standard mass flowmeter and constitute a polling slave together with the standard mass flowmeter, wherein the mass flowmeter to be calibrated is further configured to obtain the standard mass flow in real time through polling communication, and wherein the mass flowmeter to be calibrated comprises a zero calibration unit configured to calculate a new zero based on the mass flow to be calibrated and the standard mass flow so as to perform zero calibration on the mass flowmeter to be calibrated.
According to another aspect of the present invention, there is provided a method for zero point calibration, comprising: connecting a mass flow meter to be calibrated on a pipeline in series, and measuring the mass flow of fluid in the pipeline as the mass flow to be calibrated; connecting a standard mass flow meter in series on the pipe and measuring a mass flow of the fluid in the pipe as a standard mass flow; and the zero calibration unit of the mass flowmeter to be calibrated calculates a new zero based on the mass flow to be calibrated and the information about the standard mass flow so as to perform zero calibration on the mass flowmeter to be calibrated.
According to another aspect of the present invention, there is provided a mass flow meter comprising: a flow measurement unit configured to measure a mass flow rate of a fluid in a pipe to which the mass flow meter is connected; and a zero calibration unit configured to zero calibrate the mass flow meter prior to measuring a mass flow of the fluid in the pipe using the mass flow meter.
According to a further aspect of the invention, there is provided a computer readable storage medium having a program stored thereon, the program comprising computer instructions which, when executed by a processor, cause the processor to perform a method according to the invention.
Additional aspects of embodiments of the present invention are set forth in the description section that follows, wherein the detailed description is presented to fully disclose preferred embodiments of the present invention without limitation.
Drawings
The invention may be better understood by referring to the detailed description presented below in conjunction with the following drawings, in which like or similar reference numerals are used throughout the figures to indicate like or similar parts. The accompanying drawings, which are incorporated in and form a part of the specification, further illustrate the preferred embodiments of the present invention and, together with the detailed description, serve to explain the principles and advantages of the invention. Wherein:
FIG. 1 is a diagram illustrating a system for zero point calibration according to one embodiment of the present invention;
FIG. 2 is a diagram illustrating a system for zero point calibration according to another embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method for zero point calibration according to one embodiment of the present invention;
FIG. 4 is a flow diagram illustrating one particular implementation of the method of FIG. 3;
FIG. 5 is a flow diagram illustrating another particular implementation of the method of FIG. 3;
FIG. 6 is a diagram illustrating a mass flow meter according to an embodiment of the present invention;
FIGS. 7 and 8 are diagrams illustrating configuration and operation by a display screen according to an embodiment of the present invention; and
fig. 9 is a block diagram showing an example configuration of a personal computer employable in the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structure and/or the processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so much related to the present invention are omitted.
Hereinafter, the present invention will be described by taking an example in which a mass flow meter is applied to an LNG cryogenic pipeline. Therefore, hereinafter, the mass flow meter is also referred to as an LNG meter. Although the case of applying the mass flow meter to the LNG cryogenic pipeline is described herein, it will be understood by those skilled in the art that the present invention is also applicable to the case of applying the mass flow meter to the normal temperature pipeline.
First, the design principle of the present invention will be described.
To solve the problems mentioned in the background section, the present invention adds a new function, namely the function of dynamic zero point calibration, to the existing procedure of the LNG meter. A new LN2 zero is recalculated dynamically based on low flow errors in the customer flow tests (assuming all errors are due to zero changes). The new LN2 zero is then overlaid on the factory zero and the new zero is used to perform flow calculations. The new zero point is very close to the real zero point under the current LN2 condition, so that the accuracy of flow measurement is ensured. The intelligent dynamic zero calibration method provided by the invention is a design scheme which can ensure the highest precision and has the highest cost performance.
The theoretical formula of the intelligent dynamic zero calibration is derived as follows:
in the first and second steps, the average mass flow through the currently tested LNG meter (which is an example of the mass flow meter to be calibrated of the present invention) is calculated according to equations (1) and (2)
Average mass flow minus a calibration chart (which is an example of a standard mass flow meter of the present invention)
Obtaining mass flow error in a flow testing process
Average mass flow of currently tested LNG meters
Is calculated by software in an LNG table according to a formula (1), wherein FCF is a calibration coefficient which is a constant, and delta t flow Is the phase difference, Δ t, used to calculate the flow value zero Is the zero point of the table.
Mean mass flow of the calibration chart
The acquisition mode of (c) differs according to the two implementation methods described below.
If implementation method 1 is selected, then
The LNG storage tank is directly obtained from external input values or obtained from the external input values and added with calculation of an LNG table. If the implementation method 2 is selected,
obtained by automatic sampling of an LNG meter.
In the third and fourth steps, assuming that all errors are derived from the change of the zero point, the mass flow error is used according to the formula (3) and the formula (4)
Deducing to obtain a new zero point delta t zero_new . Finally, the calculated new zero point Δ t is calculated zero_new The information is stored in a database and is stored in the database,and replaces the current factory zero at with the new zero zero_original And participating in the calculation of mass flow.
Next, an implementation of the present invention will be described in detail with reference to the accompanying drawings.
According to different methods for obtaining the average mass flow of the standard table, the invention provides two methods for realizing intelligent dynamic zero calibration: an external input mode and an automatic sampling mode.
The method comprises the following steps: external input mode
A system 100 for zero point calibration according to an embodiment of the present invention will be described with reference to (a) and (b) of fig. 1.
As shown in fig. 1, the system 100 includes an LNG meter 101, a standard meter 102, and a computer 103. The LNG meter 101 and the standard meter 102 are connected in series on one pipe and are used to measure the mass flow of fluid in the pipe. The computer 103 is connected to the LNG meter 101 and the standard meter 102, respectively, receives information on the standard mass flow rate from the standard meter 102, and transmits the information to the LNG meter 101.
The computer 103 may be a client host or a notebook computer. In fig. 1 (a), a set of client hosts or laptops are connected to the LNG meter and the standard meter through RS485 ports, respectively, to monitor and configure the two meters. In fig. 1 (b), two sets of client hosts or laptops are respectively connected to the LNG meter and the standard meter through RS485 ports to monitor and configure the two meters.
Under the implementation method, when the LNG meter is subjected to dynamic zero calibration, the mass flow of the standard meter is an external input value, and the input value is sent to the LNG meter by a client host or a notebook computer through RS485 port communication.
The client host or the notebook computer needs to send the mass flow of the standard meter to the LNG meter, and then the zero calibration unit of the LNG meter can calculate a new zero according to the above formulas (1) to (4).
The LNG meter has two modes to accept the mass flow of the standard meter according to different configurations.
Mode 1: before zero calibration, the client hostOr the notebook computer directly sends the preset average standard mass flow
And (4) feeding LNG.
Mode 2: during zero calibration, the client host or the notebook computer sends the real-time mass flow of the standard meter to the LNG meter, and then the LNG meter calculates the average standard mass flow according to the received mass flow
This method requires external input values to obtain the average mass flow of the standard table. The system is simple in arrangement, but a client host or a notebook computer is required to input the required mass flow into the LNG meter, and the system is relatively complex to control.
The method 2 comprises the following steps: automatic sampling mode
A system 200 for zero point calibration according to another embodiment of the present invention will now be described with reference to fig. 2.
As shown in fig. 2, the system 200 includes an LNG meter 201, a standard meter 202, a first transmitter 203, and a second transmitter 204. The LNG meter 101 and the standard meter 102 are connected in series on one pipe and are used to measure the mass flow of fluid in the pipe. The first transmitter 203 is coupled to the LNG meter 201 and is configured with the LNG meter 201 to poll the host. The second transmitter 204 is coupled to the reference meter 202 and is configured with the reference meter 202 to poll the slave.
The RS485 communication interfaces of the LNG meter 201 and the standard meter 202 can be connected or not connected with a computer. The first transmitter 203 and the second transmitter 204 may be HART communication enabled transmitters with polling host functionality, such as 2700 transmitters.
In this case, the LNG meter 201 can automatically sample the real-time mass flow to the standard meter through HART polling communication. The zero calibration unit of the LNG meter 201 can automatically calculate the average mass flow of the standard meter according to the mass flow obtained by polling
Thereby calculating the average mass flow error
The new zero is then calculated according to equation (4) above. The whole dynamic zero calibration process is completed automatically without the participation of a client host.
By the method, no external input value is needed, the participation of a client host is not needed, the connection of the host is not needed during zero calibration, and the communication burden of the host is not increased even if the host is connected. The system control will be simpler and more intelligent. However, two transmitters are required to be installed, and the system setup is relatively complicated.
A method 300 for zero point calibration according to an embodiment of the invention will be described below with reference to fig. 3.
As shown in fig. 3, the method 300 may include steps S301 to S303.
In step S301, a mass flow meter to be calibrated is connected in series on a pipeline, and a mass flow of a fluid in the pipeline is measured as the mass flow to be calibrated.
In step S302, a proof mass flowmeter is connected in series to the pipe, and the mass flow rate of the fluid in the pipe is measured as a proof mass flow rate.
In step S303, the zero calibration unit of the mass flow meter to be calibrated calculates a new zero based on the mass flow rate to be calibrated and the information on the standard mass flow rate to perform zero calibration on the mass flow meter to be calibrated.
With respect to the method 300, there are two different specific implementations.
First, a specific implementation 400 of the method 300 will be described with reference to fig. 4. As shown in fig. 4, the method 400 may include steps S401 to S405.
In step S401, a mass flow meter to be calibrated is connected in series on a pipeline, and the mass flow of the fluid in the pipeline is measured as the mass flow to be calibrated.
In step S402, a standard mass flowmeter is connected in series to a pipe, and the mass flow rate of the fluid in the pipe is measured as a standard mass flow rate.
In step S403, the computer is caused to be connected to the mass flow meter to be calibrated and the standard mass flow meter, respectively, receive information on the standard mass flow from the standard mass flow meter as standard mass flow information, and transmit the standard mass flow information to the mass flow meter to be calibrated.
In step S404, the mass flow meter to be calibrated receives standard mass flow information from the computer.
In step S405, the zero calibration unit of the mass flow meter to be calibrated calculates a new zero based on the mass flow rate to be calibrated and the standard mass flow rate information, so as to perform zero calibration on the mass flow meter to be calibrated.
According to an embodiment of the present invention, calculating the new zero point based on the mass flow to be calibrated and the standard mass flow information may include: deriving an average mass flow to be calibrated according to the mass flow to be calibrated; deriving an average standard mass flow according to the standard mass flow information, and obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and calculating a new zero point based on the mass flow error.
According to one embodiment of the present invention, calculating the new zero point according to the mass flow error may include calculating the new zero point according to equation (4) above.
According to an embodiment of the present invention, before the zero point calibration, the standard mass flow information may be an average standard mass flow of a preset standard mass flow meter; and during zero point calibration, the proof mass flow information may be a real-time proof mass flow of the proof mass flow meter.
According to one embodiment of the invention, the computer can be connected to the mass flowmeter to be calibrated and the standard mass flowmeter respectively through the RS485 port.
According to one embodiment of the invention, the pipeline may be a pipeline for liquefied natural gas.
Another specific implementation 500 of the method 300 will be described below with reference to fig. 5. As shown in fig. 5, the method 500 may include steps S501 to S506.
In step S501, a mass flow meter to be calibrated is connected in series on a pipeline, and a mass flow of a fluid in the pipeline is measured as a mass flow to be calibrated.
In step S502, a proof mass flowmeter is connected in series to the pipe, and the mass flow rate of the fluid in the pipe is measured as a proof mass flow rate.
In step S503, the first transmitter is connected to the mass flowmeter to be calibrated, and constitutes a polling host together with the mass flowmeter to be calibrated.
In step S504, the second transmitter is connected to the standard mass flowmeter, and constitutes a polling slave together with the standard mass flowmeter.
In step S505, the mass flow meter to be calibrated obtains the standard mass flow rate in real time through polling communication.
In step S506, the zero calibration unit of the mass flow meter to be calibrated calculates a new zero based on the mass flow rate to be calibrated and the standard mass flow rate, so as to perform zero calibration on the mass flow meter to be calibrated.
According to an embodiment of the present invention, calculating the new zero point based on the mass flow to be calibrated and the standard mass flow may include: deriving average mass flow to be calibrated according to the mass flow to be calibrated; deriving from standard mass flow average standard mass flow; obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and calculating a new zero point based on the mass flow error.
According to one embodiment of the present invention, calculating the new zero point according to the mass flow error may include calculating the new zero point according to equation (4) above.
According to one embodiment of the present invention, the first transmitter and the second transmitter may be transmitters supporting HART communication with polling host functionality.
According to an embodiment of the invention, the method 500 may further include connecting the computer to the mass flowmeter to be calibrated and the reference mass flowmeter, respectively, through the RS485 port.
According to one embodiment of the invention, the pipeline may be a pipeline for liquefied natural gas.
A mass flow meter 600 according to an embodiment of the invention will be described below with reference to fig. 6.
As shown in fig. 6, the mass flow meter 600 may include: a flow measurement unit 601 configured to measure a mass flow of a fluid in a pipe to which the mass flow meter is connected; and a zero calibration unit 602 configured to zero calibrate the mass flow meter before measuring the mass flow of the fluid in the pipe using the mass flow meter.
As described above, there are two specific implementations of zero calibration for mass flowmeters.
According to implementation 400 of the present invention, zero calibration of a mass flow meter may include: connecting a mass flowmeter in series on a pipeline, and measuring the mass flow of fluid in the pipeline as the mass flow to be calibrated; connecting a standard mass flow meter in series on the pipe, and measuring a mass flow of the fluid in the pipe as a standard mass flow; causing a computer to connect to the mass flow meter and the standard mass flow meter, respectively, receive information on the standard mass flow from the standard mass flow meter as standard mass flow information, and transmit the standard mass flow information to the mass flow meter; the mass flow meter receives standard mass flow information from the computer; and the zero calibration unit calculates a new zero based on the mass flow to be calibrated and the standard mass flow information so as to perform zero calibration on the mass flowmeter.
According to implementation 400 of the present invention, calculating a new zero based on the mass flow to be calibrated and the standard mass flow information may include: deriving average mass flow to be calibrated according to the mass flow to be calibrated; deriving an average standard mass flow from the standard mass flow information; obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and calculating a new zero based on the mass flow error.
According to implementation 400 of the present invention, calculating a new zero point from the mass flow error may include calculating a new zero point according to equation (4) above.
According to implementation 400 of the present invention, the proof mass flow information may be a preset average proof mass flow of the proof mass flow meter prior to the zero point calibration, and the proof mass flow information may be a real-time proof mass flow of the proof mass flow meter during the zero point calibration.
According to implementation 400 of the present invention, a computer may be connected to the mass flow meter and the proof mass flow meter, respectively, through an RS485 port.
According to an implementation 400 of the invention, the pipeline may be a pipeline of liquefied natural gas.
According to implementation 500 of the present invention, zero calibration of a mass flow meter may include: connecting a mass flow meter on a pipeline in series, and measuring the mass flow of the fluid in the pipeline as the mass flow to be calibrated; connecting a standard mass flow meter in series on the pipe, and measuring a mass flow of the fluid in the pipe as a standard mass flow; connecting the first transmitter to a mass flowmeter, and forming a polling host together with the mass flowmeter; connecting the second transmitter to a standard mass flowmeter and forming a polling slave together with the standard mass flowmeter; the mass flowmeter obtains standard mass flow in real time through polling communication; and the zero calibration unit calculates a new zero based on the mass flow to be calibrated and the standard mass flow so as to perform zero calibration on the mass flowmeter.
According to implementation 500 of the present invention, calculating the new zero point based on the mass flow to be calibrated and the standard mass flow may include: deriving average mass flow to be calibrated according to the mass flow to be calibrated; deriving an average standard mass flow from the standard mass flow; obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and calculating a new zero based on the mass flow error.
According to implementation 500 of the present invention, calculating a new zero point from the mass flow error may include calculating a new zero point according to equation (4) above.
According to an implementation 500 of the present invention, the first transmitter and the second transmitter may be transmitters that support HART communications with polling host functionality.
According to implementation 500 of the present invention, zero calibrating the mass flow meter may further comprise connecting a computer to the mass flow meter and the standard mass flow meter via the RS485 port, respectively.
According to an implementation 500 of the invention, the pipeline may be a pipeline of liquefied natural gas.
The flow of configuring and operating a mass flow meter via digital communication or display screens will be described below.
The configuration and operational flow of the present invention can be configured through digital communication such as RS485 port, and also through the display screen (if the meter supports display).
1) Configuration and operation via digital communication, e.g. RS485 port
There are several sets of registers below that are used to configure the method, mode, time and start-stop of the zero calibration.
Register R8000 is used to configure the zero calibration method (default is 1):
r8000=1- - > preparation method 1: dynamic low-temperature zero point calibration is input from the outside,
r8000=2 — > preparation method 2: and automatic sampling dynamic low-temperature zero calibration.
Register R8001 is used to configure the mode of method 1 (default value is 1):
r8001=1- > configure mode 1 (method 1),
r8001=2 — > configure mode 2 (method 1).
Register R8002 is used to configure start/stop zero point calibration (default value is 0):
r8002=0- > stopping dynamic low-temperature zero calibration,
r8002=1- - > start dynamic low temperature zero calibration.
Register R8003 is used to configure the zero calibration time (default value is 60):
r8003= 10-120- - >10-120 seconds.
After the configuration is completed, the register R8002 writes 1, the zero point calibration is started, and after the time of zero point calibration configuration, a new zero point is written into a register and takes part in the flow calculation instead of the previous factory zero point.
2) Configuration and operation via a display screen
The flow of configuration and operation through the display screen will be described below with reference to fig. 7 and 8.
As shown in fig. 7, the method, mode, time, and start stop of the zero point calibration may be configured by the display screen. After the start zero calibration is selected, the menus (a), (b) and (c) of fig. 8 appear in sequence until the zero calibration is completed. If the calibration is successful, the menu (d) of FIG. 8 will be displayed, and the zero value just calibrated can be seen. This new zero point will override the previous factory zero point to participate in the flow calculation.
The system and method for zero point calibration and mass flow meter according to the above aspects of the invention have the following advantages: by adopting two methods, the dynamic zero calibration under the deep cooling condition is realized; the one-time passing rate of the OEM LN2 test is ensured; the field implementation is simple, and the reliability is better; the cost is saved, and the production efficiency is improved.
Furthermore, according to an embodiment of the present invention, there is also provided a computer-readable storage medium storing a program, the program comprising computer instructions that, when executed by a processor, cause the processor to perform the method for zero point calibration according to an embodiment of the present invention. Including, but not limited to, floppy disks, optical disks, magneto-optical disks, memory cards, memory sticks, and the like.
In addition, it should be noted that the method for zero point calibration according to the embodiment of the present invention may also be implemented by software and/or firmware. In the case of implementation by software and/or firmware, a program constituting the software is installed from a storage medium or a network to a computer having a dedicated hardware structure, such as a general-purpose personal computer 900 shown in fig. 9, which is capable of executing various functions and the like when various programs are installed.
In fig. 9, a Central Processing Unit (CPU) 901 performs various processes in accordance with a program stored in a Read Only Memory (ROM) 902 or a program loaded from a storage section 908 to a Random Access Memory (RAM) 903. In the RAM 903, data necessary when the CPU 901 executes various processes and the like is also stored as necessary.
The CPU 901, ROM 902, and RAM 903 are connected to each other via a bus 904. An input/output interface 905 is also connected to bus 904.
The following components are connected to the input/output interface 905: an input portion 906 including a keyboard, a mouse, and the like; an output section 907 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker and the like; a storage section 908 including a hard disk and the like; and a communication section 909 including a network interface card such as a LAN card, a modem, and the like. The communication section 909 performs communication processing via a network such as the internet.
A driver 910 is also connected to the input/output interface 905 as necessary. A removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 910 as necessary, so that a computer program read out therefrom is mounted in the storage section 908 as necessary.
In the case where the series of processes described above is realized by software, a program constituting the software is installed from a network such as the internet or a storage medium such as the removable medium 911.
It will be understood by those skilled in the art that such a storage medium is not limited to the removable medium 911 shown in fig. 9 in which the program is stored, distributed separately from the apparatus to provide the program to the user. Examples of the removable medium 911 include a magnetic disk (including a flexible disk (registered trademark)), an optical disk (including a compact disc-read only memory (CD-ROM) and a Digital Versatile Disc (DVD)), a magneto-optical disk (including a mini-disk (MD) (registered trademark)), and a semiconductor memory. Alternatively, the storage medium may be the ROM 902, a hard disk included in the storage section 908, or the like, in which programs are stored, and which is distributed to users together with the device including them.
Although the present invention has been described above with reference to exemplary embodiments, it is to be understood that the invention is not limited to the embodiments described and illustrated in detail herein, and that various changes may be made in the exemplary embodiments by those skilled in the art without departing from the scope defined by the appended claims.
Claims (32)
1. A system for zero point calibration, comprising:
the mass flow meter to be calibrated is connected to a pipeline in series and measures the mass flow of the fluid in the pipeline as the mass flow to be calibrated;
a proof mass flow meter configured to be connected in series on the pipe and to measure a mass flow rate of a fluid in the pipe as a proof mass flow rate; and
a computer configured to be connected to the mass flow meter to be calibrated and the reference mass flow meter, respectively, receive information about the reference mass flow from the reference mass flow meter as reference mass flow information, and send the reference mass flow information to the mass flow meter to be calibrated,
wherein the mass flow meter to be calibrated is further configured to receive the standard mass flow information from the computer,
wherein the mass flow meter to be calibrated comprises a zero point calibration unit configured to calculate a new zero point based on the mass flow rate to be calibrated and the standard mass flow rate information to perform zero point calibration on the mass flow meter to be calibrated,
wherein calculating a new zero based on the mass flow to be calibrated and the standard mass flow information comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average standard mass flow from the standard mass flow information;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point from the mass flow error, an
Wherein calculating the new zero based on the mass flow error comprises calculating the new zero based on:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the original zero point of the mass flow meter to be calibrated,
is the mass flow error and FCF is a calibration coefficient that is a constant.
2. The system of claim 1, wherein,
the proof mass flow information is a preset average proof mass flow of the proof mass flowmeter before zero point calibration, and
during zero point calibration, the proof mass flow information is a real-time proof mass flow of the proof mass flow meter.
3. The system of claim 1 or 2, wherein the computer is connected to the mass flowmeter to be calibrated and the reference mass flowmeter, respectively, through an RS485 port.
4. The system of claim 1 or 2, wherein the pipeline is a pipeline for liquefied natural gas.
5. A system for zero point calibration, comprising:
the mass flow meter to be calibrated is connected to a pipeline in series and measures the mass flow of the fluid in the pipeline as the mass flow to be calibrated;
a proof mass flow meter configured to be connected in series on the pipe and to measure a mass flow rate of a fluid in the pipe as a proof mass flow rate;
the first transmitter is configured to be connected to the mass flowmeter to be calibrated and form a polling host together with the mass flowmeter to be calibrated; and
a second transmitter configured to be coupled to the proof mass flowmeter and to constitute a polling slave with the proof mass flowmeter,
wherein the mass flow meter to be calibrated is further configured to obtain the reference mass flow rate in real time through polling communication,
wherein the mass flow meter to be calibrated comprises a zero calibration unit configured to calculate a new zero based on the mass flow rate to be calibrated and the standard mass flow rate to perform zero calibration on the mass flow meter to be calibrated,
wherein calculating a new zero based on the mass flow to be calibrated and the standard mass flow comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average proof mass flow from the proof mass flow;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point from the mass flow error, an
Wherein calculating the new zero based on the mass flow error comprises calculating the new zero based on:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the original zero point of the mass flow meter to be calibrated,
is the mass flow error and FCF is a calibration coefficient that is a constant.
6. The system of claim 5, wherein the first and second transmitters are HART communication with polling host functionality enabled transmitters.
7. The system of claim 5 or 6, further comprising a computer connected to the mass flow meter to be calibrated and the reference mass flow meter, respectively, through an RS485 port.
8. The system of claim 5 or 6, wherein the pipeline is a pipeline of liquefied natural gas.
9. A method for zero point calibration, comprising:
connecting a mass flow meter to be calibrated on a pipeline in series, and measuring the mass flow of fluid in the pipeline as the mass flow to be calibrated;
connecting a standard mass flow meter in series on the pipe and measuring a mass flow of the fluid in the pipe as a standard mass flow; and
and the zero calibration unit of the mass flowmeter to be calibrated calculates a new zero based on the mass flow to be calibrated and the information about the standard mass flow so as to perform zero calibration on the mass flowmeter to be calibrated.
10. The method of claim 9, further comprising:
connecting a computer to the mass flow meter to be calibrated and the standard mass flow meter, respectively, receiving information on the standard mass flow from the standard mass flow meter as standard mass flow information, and sending the standard mass flow information to the mass flow meter to be calibrated; and
the mass flowmeter to be calibrated receives the standard mass flow information from the computer,
and the zero calibration unit calculates a new zero based on the mass flow to be calibrated and the standard mass flow information so as to perform zero calibration on the mass flow meter to be calibrated.
11. The method of claim 10, wherein calculating a new zero based on the mass flow to be calibrated and the standard mass flow information comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average standard mass flow from the standard mass flow information;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point from the mass flow error.
12. The method of claim 11, wherein calculating the new zero based on the mass flow error comprises calculating the new zero based on:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the original zero point of the mass flow meter to be calibrated,
is the mass flow error and FCF is a calibration coefficient that is a constant.
13. The method of any one of claims 10 to 12,
the proof mass flow information is a preset average proof mass flow of the proof mass flowmeter before zero point calibration, and
during zero point calibration, the proof mass flow information is a real-time proof mass flow of the proof mass flow meter.
14. The method of any one of claims 10 to 12, wherein the computer is connected to the mass flow meter to be calibrated and the reference mass flow meter, respectively, through an RS485 port.
15. The method of claim 9, further comprising:
connecting a first transmitter to the mass flowmeter to be calibrated, and forming a polling host together with the mass flowmeter to be calibrated;
coupling a second transmitter to the proof mass flow meter and forming a polling slave with the proof mass flow meter; and
the mass flowmeter to be calibrated obtains the standard mass flow in real time through polling communication,
and the zero point calibration unit calculates a new zero point based on the mass flow to be calibrated and the standard mass flow so as to perform zero point calibration on the mass flow meter to be calibrated.
16. The method of claim 15, wherein calculating a new zero based on the mass flow to be calibrated and the standard mass flow comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average proof mass flow from the proof mass flow;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point from the mass flow error.
17. The method of claim 16, wherein, calculating the new zero point according to the mass flow error comprises calculating the new zero point according to:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the original zero point of the mass flow meter to be calibrated,
is the mass flow error and FCF is a calibration coefficient that is a constant.
18. The method of any of claims 15 to 17, wherein the first and second transmitters are HART communication enabled transmitters with polling host functionality.
19. The method of any one of claims 15 to 17, further comprising connecting a computer to the mass flow meter to be calibrated and the reference mass flow meter, respectively, via an RS485 port.
20. The method of claim 9, wherein the pipeline is a pipeline for liquefied natural gas.
21. A mass flow meter comprising:
a flow measurement unit configured to measure a mass flow rate of a fluid in a pipe to which the mass flow meter is connected; and
a zero calibration unit configured to zero calibrate the mass flow meter prior to measuring a mass flow of a fluid in the pipe using the mass flow meter.
22. The mass flow meter of claim 21, wherein zero calibrating the mass flow meter comprises:
connecting the mass flow meters in series on the pipeline, and measuring the mass flow of the fluid in the pipeline as the mass flow to be calibrated;
connecting a standard mass flow meter in series on the pipe and measuring a mass flow of the fluid in the pipe as a standard mass flow;
causing a computer to connect to the mass flow meter and the proof mass flow meter, respectively, receive information about the proof mass flow from the proof mass flow meter as proof mass flow information, and transmit the proof mass flow information to the mass flow meter;
the mass flow meter receiving the standard mass flow information from the computer; and
and the zero calibration unit calculates a new zero based on the mass flow to be calibrated and the standard mass flow information so as to calibrate the zero of the mass flowmeter.
23. The mass flow meter of claim 22, wherein calculating a new zero based on the mass flow to be calibrated and the proof mass flow information comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average standard mass flow from the standard mass flow information;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point from the mass flow error.
24. The mass flow meter of claim 23, wherein calculating the new zero from the mass flow error comprises calculating the new zero according to:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the raw zero point of the mass flow meter,
is the mass flow error and FCF is a calibration coefficient that is a constant.
25. A mass flow meter according to any of claims 22 to 24,
the proof mass flow information is a preset average proof mass flow of the proof mass flowmeter before zero point calibration, and
during zero point calibration, the proof mass flow information is a real-time proof mass flow of the proof mass flow meter.
26. A mass flow meter according to any of claims 22 to 24, wherein the computer is connected to the mass flow meter and the reference mass flow meter respectively via an RS485 port.
27. The mass flow meter of claim 21, wherein zero calibrating the mass flow meter comprises:
connecting the mass flow meters in series on the pipeline, and measuring the mass flow of the fluid in the pipeline as the mass flow to be calibrated;
connecting a standard mass flow meter in series on the pipe and measuring a mass flow of the fluid in the pipe as a standard mass flow;
connecting a first transmitter to the mass flow meter and forming a polling host together with the mass flow meter;
coupling a second transmitter to the proof mass flow meter and forming a polling slave with the proof mass flow meter;
the mass flowmeter obtains the standard mass flow in real time through polling communication; and
and the zero calibration unit calculates a new zero based on the mass flow to be calibrated and the standard mass flow so as to calibrate the zero of the mass flowmeter.
28. The mass flow meter of claim 27, wherein calculating a new zero based on the mass flow to be calibrated and the proof mass flow comprises:
deriving an average mass flow to be calibrated according to the mass flow to be calibrated;
deriving an average proof mass flow from the proof mass flow;
obtaining a mass flow error according to the difference between the average mass flow to be calibrated and the average standard mass flow; and
calculating the new zero point based on the mass flow error.
29. The mass flow meter of claim 28, wherein calculating the new zero from the mass flow error comprises calculating the new zero according to:
wherein, Δ t zero_new Is the new zero point, Δ t zero_original Is the raw zero point of the mass flow meter,
is the mass flow error and FCF is a calibration coefficient that is a constant.
30. The mass flow meter of any of claims 27 to 29, wherein the first and second transmitters are HART communication enabled transmitters with polling host functionality.
31. The mass flow meter of any of claims 27 to 29, wherein zero calibrating the mass flow meter further comprises connecting a computer to the mass flow meter and the reference mass flow meter via RS485 ports, respectively.
32. A mass flow meter according to claim 21, wherein the pipeline is a pipeline for liquefied natural gas.
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