CN107796492B - Online calibration method for ultrasonic gas meter - Google Patents
Online calibration method for ultrasonic gas meter Download PDFInfo
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- CN107796492B CN107796492B CN201711173901.0A CN201711173901A CN107796492B CN 107796492 B CN107796492 B CN 107796492B CN 201711173901 A CN201711173901 A CN 201711173901A CN 107796492 B CN107796492 B CN 107796492B
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- ultrasonic
- gas meter
- ultrasonic gas
- sound velocity
- pressure sensor
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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
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Electromagnetism (AREA)
Abstract
The invention discloses an online calibration method for an ultrasonic gas meter, and belongs to the technical field of metering instruments. The method is characterized in that: one or more ultrasonic sound velocity measuring devices are installed in a main pipeline of an ultrasonic gas meter installation cell or a branch pipeline close to the cell, the ultrasonic sound velocity measuring devices measure the sound velocity of ultrasonic waves in the gas pipeline, measured sound velocity data are transmitted to the ultrasonic gas meter in an information transmission mode, the ultrasonic gas meter calculates accurate working condition flow according to the sound velocity data, and then accurate standard working condition flow is obtained through temperature and pressure compensation. The method can realize the accurate measurement of the flow of the ultrasonic gas meter under any working condition of gas quality, and improve the measurement accuracy.
Description
Technical Field
The invention relates to an online calibration method for an ultrasonic gas meter, and belongs to the technical field of metering instruments.
Background
The ultrasonic gas meter is a gas metering instrument widely applied at present, and has the advantages of wide measuring range, high precision and the like. The working principle is as follows: a pair of ultrasonic sensors arranged at the upper and lower positions are adopted to oppositely transmit and receive ultrasonic waves, the flow velocity of the gas medium is calculated by utilizing the propagation time difference of ultrasonic signals in the forward flow direction and the reverse flow direction in the gas medium and the sound velocity of the ultrasonic waves in the measured gas, and then the instantaneous flow and the accumulated flow are calculated.
When the ultrasonic gas meter is used for flow calculation, the sound velocity is set according to the gas component of the gas, and is a fixed value for the gas with a specific component. However, the components of the fuel gas in different regions are different, and the fuel gas with different components has different heat values and different densities, so that the propagation speeds of ultrasonic waves in the fuel gas with different gas components are different, thereby causing the uncertainty of the measurement of the ultrasonic gas meter. Therefore, the ultrasonic gas meter in the market at present can only be applied to gas with certain gas components, and when the gas components change, the metering accuracy is greatly reduced.
In addition, because the fuel gas usually contains a plurality of corrosive gases, the common pressure sensor can be gradually corroded, aged and even failed in the fuel gas, so that the metering precision is reduced, the effective service life of the common pressure sensor cannot reach the national specified age limit, the common pressure sensor is one of the reasons that the ultrasonic gas meter and the ultrasonic gas metering module sold at home and abroad do not have the pressure compensation function at present, and the gas flow measurement precision is greatly reduced because the gas pressure measurement and the flow pressure compensation are not used.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the online calibration method for the ultrasonic gas meter, which can enable the ultrasonic gas meter to be suitable for gas with any gas component and can accurately measure the gas.
The invention is realized by the following technical scheme: an online calibration method for an ultrasonic gas meter is characterized by comprising the following steps: one or more ultrasonic sound velocity measuring devices are installed in a main pipeline of an ultrasonic gas meter installation cell or a branch pipeline close to the cell, the ultrasonic sound velocity measuring devices measure the sound velocity of ultrasonic waves in the gas pipeline, measured sound velocity data are transmitted to the ultrasonic gas meter in an information transmission mode, the ultrasonic gas meter calculates accurate working condition flow according to the sound velocity data, and then accurate standard working condition flow is obtained through temperature and pressure compensation.
According to the invention, the actual sound velocity of the ultrasonic waves in the gas pipeline is measured, then the actual sound velocity data is transmitted to each ultrasonic gas meter, and the ultrasonic gas meter calculates according to the actual sound velocity data, so that an accurate working condition flow numerical value can be obtained, and the ultrasonic gas meter can realize accurate measurement of the working condition flow of any gas quality.
Further, in order to facilitate online calibration of the built-in pressure sensors of the ultrasonic gas meters, the ultrasonic sound velocity measurement device includes a corrosion-resistant standard pressure sensor, collects pressure data of the standard pressure sensor in the gas pipeline and the built-in pressure sensor in each ultrasonic gas meter in the ultrasonic gas meter group in a wired or wireless communication manner, transmits information, compares the collected pressure data of the standard pressure sensor with the collected pressure data of each ultrasonic gas meter in the ultrasonic gas meter group, and then performs online calibration on the built-in pressure sensor in each ultrasonic gas meter in the ultrasonic gas meter group according to a comparison result.
Further, the information transmission comprises a networking mode and a wired or wireless communication mode of a wide area network and/or a local area network and/or an ad hoc network.
The invention has the beneficial effects that: according to the invention, the ultrasonic sound velocity measuring device is arranged on the corresponding gas pipeline, the ultrasonic sound velocity measuring device is utilized to measure the ultrasonic sound velocity in the gas pipeline, then the sound velocity data is transmitted to each ultrasonic gas meter, the ultrasonic gas meters calculate according to the actual sound velocity data, so that an accurate working condition flow value is obtained, and an accurate standard working condition flow is obtained through temperature and pressure compensation. The method can realize accurate measurement of the flow of the ultrasonic gas meter under any working condition of gas quality, and improve the measurement accuracy. In addition, the corrosion-resistant standard pressure sensor is arranged, so that the built-in pressure sensors of the ultrasonic gas meters in an effective range can be calibrated on line, the accuracy of pressure compensation of the metering data of the ultrasonic gas meters is ensured, and the ultrasonic gas meters have higher metering precision.
Detailed Description
The invention is further illustrated by the following non-limiting examples:
The online calibration method for the ultrasonic gas meter comprises the steps that one or more ultrasonic sound velocity measuring devices are installed in a main pipeline of an ultrasonic gas meter installation cell or a branch pipeline close to the cell, the ultrasonic sound velocity measuring devices measure the sound velocity of ultrasonic waves in a gas pipeline, measured sound velocity data are transmitted to the ultrasonic gas meters in an information transmission mode, the ultrasonic gas meter calculates accurate working condition flow according to the sound velocity data, and then accurate standard working condition flow is obtained through temperature and pressure compensation.
The ultrasonic sound velocity measurement apparatus described in this embodiment is the prior art, and the specific structure thereof is not described herein again. The ultrasonic gas meter described in this embodiment is also the prior art, the ultrasonic gas meter is provided with a pressure sensor inside, and the flow measurement method adopted by the ultrasonic gas meter is also the prior art, and the specific structure thereof is not repeated herein.
In order to facilitate online calibration of the built-in pressure sensors of the ultrasonic gas meters, the ultrasonic sound velocity measuring device comprises a corrosion-resistant and high-precision standard pressure sensor, pressure data of the standard pressure sensor in the gas pipeline and the built-in pressure sensor in each ultrasonic gas meter in the ultrasonic gas meter group are acquired and transmitted in a wired or wireless communication mode, the acquired pressure data of the standard pressure sensor and the acquired pressure data of each ultrasonic gas meter in the ultrasonic gas meter group are compared, then the built-in pressure sensor in each ultrasonic gas meter in the ultrasonic gas meter group is calibrated online according to the comparison result, and the accuracy of pressure compensation of each gas meter in the ultrasonic gas meter group is ensured.
In this embodiment, the information transmission includes a networking mode and a wired or wireless communication mode of a wide area network and/or a local area network and/or an ad hoc network.
Other parts in this embodiment are known in the art and will not be described herein.
Claims (3)
1. An online calibration method for an ultrasonic gas meter is characterized by comprising the following steps: one or more ultrasonic sound velocity measuring devices are installed in a main pipeline of an ultrasonic gas meter installation cell or a branch pipeline close to the cell, the ultrasonic sound velocity measuring devices measure the sound velocity of ultrasonic waves in the gas pipeline, measured sound velocity data are transmitted to the ultrasonic gas meter in an information transmission mode, the ultrasonic gas meter calculates accurate working condition flow according to the sound velocity data, and then accurate standard working condition flow is obtained through temperature and pressure compensation.
2. The online calibration method for the ultrasonic gas meter as claimed in claim 1, which is characterized in that: the ultrasonic sound velocity measuring device comprises a corrosion-resistant standard pressure sensor, pressure data of the standard pressure sensor in a gas pipeline and pressure data of a pressure sensor built in each ultrasonic gas meter in an ultrasonic gas meter group are acquired and transmitted in a wired or wireless communication mode, the acquired pressure data of the standard pressure sensor and the acquired pressure data of each ultrasonic gas meter in the ultrasonic gas meter group are compared, and then the built-in pressure sensor in each ultrasonic gas meter in the ultrasonic gas meter group is calibrated on line according to a comparison result.
3. The online calibration method for the ultrasonic gas meter according to claim 1 or 2, characterized in that: the information transmission comprises a networking mode and a wired or wireless communication mode of a wide area network and/or a local area network and/or an ad hoc network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173901.0A CN107796492B (en) | 2017-11-22 | 2017-11-22 | Online calibration method for ultrasonic gas meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173901.0A CN107796492B (en) | 2017-11-22 | 2017-11-22 | Online calibration method for ultrasonic gas meter |
Publications (2)
| Publication Number | Publication Date |
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| CN107796492A CN107796492A (en) | 2018-03-13 |
| CN107796492B true CN107796492B (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711173901.0A Active CN107796492B (en) | 2017-11-22 | 2017-11-22 | Online calibration method for ultrasonic gas meter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111597718B (en) * | 2020-05-19 | 2021-04-02 | 成都千嘉科技有限公司 | Ultrasonic flowmeter or gas meter flow channel design system and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10161915A1 (en) * | 2000-12-27 | 2002-08-29 | Surpass Industry Co | Flow rate measuring method, ultrasonic flow rate meter, flow rate measuring method, temperature or pressure measuring method, ultrasonic thermometer and ultrasonic pressure sensor |
| US9797760B2 (en) * | 2012-10-19 | 2017-10-24 | Daniel Measurement And Control, Inc. | Quantitative analysis of flow profile characteristics for ultrasonic metering systems |
| CN203337198U (en) * | 2013-07-26 | 2013-12-11 | 成都千嘉科技有限公司 | Ultrasonic gas meter |
| CN105547420A (en) * | 2016-01-18 | 2016-05-04 | 成都千嘉科技有限公司 | Ultrasonic fuel meter flow point coefficient correcting device and method |
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