CN117387724A - High-precision liquid level remote measuring and alarming system - Google Patents
High-precision liquid level remote measuring and alarming system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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- G01F23/2968—Transducers specially adapted for acoustic level indicators
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- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
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- H—ELECTRICITY
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- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
- H04Q2209/43—Arrangements in telecontrol or telemetry systems using a wireless architecture using wireless personal area networks [WPAN], e.g. 802.15, 802.15.1, 802.15.4, Bluetooth or ZigBee
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Abstract
The invention relates to the technical field of liquid level monitoring, in particular to a high-precision liquid level telemetering alarm system, which comprises a micro control unit, at least one ultrasonic sensor, a wireless communication module, a power module and a self-adaptive liquid level compensation module, wherein the ultrasonic sensor sends data to the micro control unit for preliminary processing after liquid level measurement; the micro control unit is connected with the self-adaptive liquid level compensation module, and the self-adaptive liquid level compensation module performs accurate compensation of liquid level data according to physical properties of the liquid, such as temperature, density and viscosity information, so as to improve measurement accuracy; the compensated liquid level data is sent to a remote monitoring site by the micro control unit through the wireless communication module; the power module provides stable power support for the whole system. According to the invention, the adaptive liquid level compensation module can accurately compensate liquid levels according to different liquid physical properties by using an adaptive filtering algorithm, a neural network and other advanced compensation algorithms.
Description
Technical Field
The invention relates to the technical field of liquid level monitoring, in particular to a high-precision liquid level telemetering and alarming system.
Background
Liquid level measurement is a critical parameter in industrial automation, environmental monitoring, and various liquid storage and processing scenarios. Conventional liquid level measuring methods such as a floating ball gauge, a differential pressure type liquid meter, a capacitance type liquid meter, etc., are generally affected by various factors such as temperature variation, density inconsistency or viscosity fluctuation, which may cause a decrease in measurement accuracy. In addition, conventional level measurement systems are often closed loop, lacking real-time remote monitoring and alarm functionality.
In recent years, although some modern level measurement systems using ultrasonic, radar or optical sensors have emerged, these systems have improved in terms of accuracy and stability. However, these systems often ignore the effects of physical properties of the liquid, such as temperature, density and viscosity, on the measurement results, and thus in complex practical application environments, their accuracy is still limited, while these systems often do not integrate efficient data processing and alarm mechanisms.
Accordingly, there is a strong need in the art for a liquid level measurement system that provides high accuracy, high stability, and is capable of adapting to complex liquid properties and environmental conditions, and that also has real-time remote monitoring and alarm functions to meet the high demands of modern industrial and environmental monitoring applications.
Disclosure of Invention
Based on the above object, the invention provides a high-precision liquid level telemetering and alarming system.
A high-precision liquid level telemetering alarm system comprises a micro control unit, at least one ultrasonic sensor, a wireless communication module, a power supply module and a self-adaptive liquid level compensation module, wherein,
after the ultrasonic sensor performs liquid level measurement, data are sent to the micro control unit for preliminary processing;
the micro control unit is connected with the self-adaptive liquid level compensation module, and the self-adaptive liquid level compensation module performs accurate compensation of liquid level data according to physical properties of the liquid, such as temperature, density and viscosity information, so as to improve measurement accuracy;
the compensated liquid level data is sent to a remote monitoring site by the micro control unit through the wireless communication module;
when the liquid level data is lower than or higher than a preset safety range, the micro control unit triggers an alarm signal;
the power module provides stable power support for the whole system.
Further, the micro control unit is an ARM Cortex-M series micro control unit, the micro control unit receives and analyzes digital liquid level data from the ultrasonic sensor, performs data interaction on the received liquid physical attribute data and the self-adaptive liquid level compensation module according to the analysis result, controls the wireless communication module to transmit the liquid level data, and meanwhile, monitors the state of the power supply module and gives an alarm when the power supply is insufficient.
Further, the micro control unit is connected with the ultrasonic sensor through a digital input/output port and receives digital liquid level data, after the ultrasonic sensor collects liquid level information, the digital liquid level data are transmitted to the micro control unit through an SPI serial communication interface, the micro control unit analyzes the digital liquid level data through an analysis algorithm, and the analyzed data comprise a liquid level height value, a liquid level change speed in unit time and a liquid level measurement signal-to-noise ratio;
the micro control unit is connected to the self-adaptive liquid level compensation module through a special data channel, and after the micro control unit finishes analyzing the liquid level data of the ultrasonic sensor, the analysis result and the physical attribute data (such as temperature, density and viscosity) of the liquid are sent to the self-adaptive liquid level compensation module through the special data channel;
the analysis result and the liquid physical attribute data received by the self-adaptive liquid level compensation module are used for liquid level compensation depth calculation, after the compensation depth calculation is completed, the self-adaptive liquid level compensation module sends the compensated liquid level data back to the micro-control unit through the same data channel, and the micro-control unit receives the compensated liquid level data and carries out further data processing or alarm judgment according to the liquid level data.
Further, the ultrasonic sensor adopts an analog-to-digital conversion technology to convert the analog signal of the liquid level into a digital signal, so that high precision and stability of data in the transmission process are ensured, errors caused by interference of the analog signal are avoided, the digital signal is then sent to the micro-control unit for further processing, the analog-to-digital conversion technology is realized through a 16-bit high-precision analog-to-digital converter, the analog-to-digital converter is directly connected with the analog signal output end of the ultrasonic sensor, and after the ultrasonic sensor detects the liquid level information and generates the analog signal, the signal is input into the analog-to-digital converter, and the analog-to-digital converter is ensured to lock the amplitude of the input analog signal in a short time based on a sample hold technology, so that noise influence in the conversion process is reduced;
the analog-to-digital converter adopts the Sigma-Delta conversion principle, through oversampling the analog signal, the noise is removed by using a digital filter, the analog-to-digital converter firstly decomposes the analog signal into a plurality of quantization levels, each level is associated with a specific digital code, and the digital codes are further processed by a Sigma-Delta algorithm to obtain high-precision digital liquid level data.
Further, the self-adaptive liquid level compensation module comprises a high-speed digital processing unit and a plurality of sensing input ports, wherein the sensing input ports are respectively used for receiving temperature, density and viscosity data of liquid, and the data are measured by corresponding sensors (such as a thermistor, a densimeter and a viscometer) and transmitted to the self-adaptive liquid level compensation module for processing;
the high-speed digital processing unit comprises a compensation algorithm library which runs in real time, receives the original liquid level data and the liquid temperature, density and viscosity data, and transmits the data to the compensation algorithm library for calculation.
Further, the compensation algorithm library comprises an adaptive filtering algorithm, liquid level data compensation is performed through the adaptive filtering algorithm, the algorithm dynamically adjusts the liquid level data according to physical properties (such as temperature, density and viscosity) of the liquid, and compensates measurement errors, and the algorithm is provided withFor the received raw liquid level data, wherein +.>The temperature, density and viscosity of the liquid are expressed separately, and are compensated by the following formula:
wherein,is a coefficient determined in advance by experiments, the liquid level data after compensation +.>And then transmitted to the micro-control unit.
Further, the compensation algorithm library also comprises a neural network model for processing liquid level data with larger deviation from the historical data, the neural network model is trained by the historical experimental data, the depth structure of the neural network model considers the nonlinear relation between the physical properties of the liquid and the liquid level, the liquid level compensation is carried out, and the liquid level data processed by the compensation algorithm libraryAnd the final treatment is carried out after the final treatment is carried out by the micro control unit.
Further, the wireless communication module comprises Wi-Fi, bluetooth and 4G LTE communication modes, an AES encryption algorithm is adopted to ensure the safety of data in the transmission process, and when the micro control unit sends a data request, the wireless communication module encrypts the compensated liquid level data and sends the liquid level data to a remote monitoring site in a preset communication mode.
Furthermore, the power module combines a solar panel and a high-capacity lithium battery, and adopts an intelligent charge-discharge management system, and the system automatically switches a power supply mode according to ambient light conditions to ensure continuous and stable operation of the system, and meanwhile, the module periodically reports a power state to a micro control unit.
The invention has the beneficial effects that:
according to the invention, a comprehensive and precise liquid level detection scheme is formed by integrating a plurality of core components such as a Micro Control Unit (MCU), an ultrasonic sensor, a wireless communication module, a power module, a self-adaptive liquid level compensation module and the like, and particularly, the system can convert an analog signal from the ultrasonic sensor into high-precision digital data through an analog-to-digital conversion technology, so that the accuracy and stability of liquid level measurement are greatly improved.
In the aspect of data processing, the Micro Control Unit (MCU) is not only responsible for receiving and analyzing the liquid level data from the ultrasonic sensor, but also performs tight data interaction with the self-adaptive liquid level compensation module. Particularly, by applying an adaptive filtering algorithm, a neural network and other advanced compensation algorithms, the adaptive liquid level compensation module can accurately compensate liquid levels according to different liquid physical properties (such as temperature, density and viscosity), and further optimize the measurement result of the system.
According to the invention, the wireless communication module enables the liquid level data to be transmitted to a remote monitoring platform or other endpoint equipment in real time, so that efficient data management and a rapid alarm mechanism are realized. The system combines long-period stable power supply of the power supply module, so that the system has excellent performance and reliability in industrial environment and even in application scenes far away from power supply and having complex environment. The series of comprehensive advantages lead the invention to have wide application prospect and commercial value.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an alarm system module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a compensation algorithm library according to an embodiment of the present invention.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As shown in fig. 1-2, a high-precision liquid level telemetry alarm system comprises a micro control unit, at least one ultrasonic sensor, a wireless communication module, a power module and an adaptive liquid level compensation module, wherein,
after the ultrasonic sensor performs liquid level measurement, data are sent to the micro control unit for preliminary processing;
the micro control unit is connected with the self-adaptive liquid level compensation module, and the self-adaptive liquid level compensation module performs accurate compensation of liquid level data according to physical properties of the liquid, such as temperature, density and viscosity information, so as to improve measurement accuracy;
the compensated liquid level data is sent to a remote monitoring site by the micro control unit through the wireless communication module;
when the liquid level data is lower than or higher than a preset safety range, the micro control unit triggers an alarm signal;
the power module provides stable power support for the whole system.
The micro control unit is ARM Cortex-M series micro control unit, the micro control unit receives and analyzes digital liquid level data from the ultrasonic sensor, performs data interaction on the received liquid physical attribute data and the self-adaptive liquid level compensation module according to the analysis result, controls the wireless communication module to transmit the liquid level data, and meanwhile, monitors the state of the power supply module and gives an alarm when the power supply is insufficient.
The micro control unit is connected with the ultrasonic sensor through a digital input/output port, receives digital liquid level data, transmits the digital liquid level data to the micro control unit through an SPI serial communication interface after the ultrasonic sensor collects liquid level information, and analyzes the digital liquid level data through an analysis algorithm, wherein the analyzed data comprises a liquid level height value, a liquid level change speed in unit time and a liquid level measurement signal-to-noise ratio;
the micro control unit is connected to the self-adaptive liquid level compensation module through a special data channel, and after the micro control unit finishes analyzing the liquid level data of the ultrasonic sensor, the analysis result and the physical attribute data (such as temperature, density and viscosity) of the liquid are sent to the self-adaptive liquid level compensation module through the special data channel;
the analysis result and the liquid physical attribute data received by the self-adaptive liquid level compensation module are used for liquid level compensation depth calculation, after the compensation depth calculation is completed, the self-adaptive liquid level compensation module sends the compensated liquid level data back to the micro-control unit through the same data channel, and the micro-control unit receives the compensated liquid level data and carries out further data processing or alarm judgment according to the liquid level data.
The ultrasonic sensor adopts an analog-to-digital conversion technology to convert the analog signal of the liquid level into a digital signal, so that high precision and stability of data in the transmission process are ensured, errors caused by interference of the analog signal are avoided, the digital signal is then sent to the micro control unit for further processing, the analog-to-digital conversion technology is realized through a 16-bit high-precision analog-to-digital converter, the analog-to-digital converter is directly connected with an analog signal output end of the ultrasonic sensor, and after the ultrasonic sensor detects the liquid level information and generates the analog signal, the signal is input into the analog-to-digital converter which is based on a sample hold technology, so that the amplitude of the input analog signal is locked in a short time, and the noise influence in the conversion process is reduced;
the analog-to-digital converter adopts a Sigma-Delta (Sigma-Delta) conversion principle, through oversampling an analog signal, noise is removed by using a digital filter, the analog-to-digital converter firstly decomposes the analog signal into a plurality of quantization levels, each level is associated with a specific digital code, and the digital codes are further processed by a Sigma-Delta (Sigma-Delta) algorithm to obtain high-precision digital liquid level data;
after the analog-to-digital conversion is completed, the ADC sends 16-bit high-precision digital liquid level data to a Micro Control Unit (MCU) through a serial communication interface (such as SPI or I2C). Within the MCU, these high precision digital level data will be parsed and used for subsequent data processing and level compensation.
In this claim, the analog-to-digital conversion technique is used as a key data conversion link between the ultrasonic sensor and the Micro Control Unit (MCU), and the high precision ADC and advanced conversion algorithm used by the analog-to-digital conversion technique ensure high precision and stability of the liquid level data during transmission and processing, which not only improves the overall performance of the system, but also enables the system to maintain accurate and reliable liquid level measurement under various complex environmental conditions.
The self-adaptive liquid level compensation module comprises a high-speed digital processing unit and a plurality of sensing input ports, and is used for receiving temperature, density and viscosity data of the liquid, wherein the data are measured by corresponding sensors (such as a thermistor, a densimeter and a viscometer) and are transmitted to the self-adaptive liquid level compensation module for processing;
the high-speed digital processing unit comprises a compensation algorithm library which runs in real time, receives the original liquid level data and the liquid temperature, density and viscosity data, and transmits the data to the compensation algorithm library for calculation.
The compensation algorithm library comprises an adaptive filtering algorithm, liquid level data compensation is carried out through the adaptive filtering algorithm, the algorithm dynamically adjusts the liquid level data according to the physical properties (such as temperature, density and viscosity) of the liquid, and compensates measurement errors, and the algorithm is providedFor the received raw liquid level data, wherein +.>The temperature, density and viscosity of the liquid are expressed separately, and are compensated by the following formula:
wherein,is a coefficient determined in advance by experiments, the liquid level data after compensation +.>And then transmitted to the micro-control unit.
The compensation algorithm library also comprises a neural network model for processing liquid level data with larger deviation from the historical data, the neural network model is trained by the historical experimental data, the depth structure of the neural network model considers the nonlinear relation between the physical properties of the liquid and the liquid level, the liquid level compensation is carried out, and the liquid level data processed by the compensation algorithm libraryAnd the final treatment is carried out after the final treatment is carried out by the micro control unit.
The wireless communication module comprises Wi-Fi, bluetooth and 4G LTE communication modes, an AES encryption algorithm is adopted to ensure the safety of data in the transmission process, and when the micro control unit sends a data request, the wireless communication module encrypts the compensated liquid level data and sends the liquid level data to a remote monitoring site in a preset communication mode.
The power module combines a solar panel and a high-capacity lithium battery, adopts an intelligent charge-discharge management system, automatically switches a power supply mode according to ambient light conditions to ensure continuous and stable operation of the system, and simultaneously, periodically reports power states such as voltage, current, residual electric quantity and the like to the micro-control unit, so that the MCU can adjust the working mode of the system according to the power states or timely send out low-electricity alarms.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high-precision liquid level telemetering alarm system is characterized by comprising a micro control unit, at least one ultrasonic sensor, a wireless communication module, a power supply module and a self-adaptive liquid level compensation module, wherein,
after the ultrasonic sensor performs liquid level measurement, data are sent to the micro control unit for preliminary processing;
the micro control unit is connected with the self-adaptive liquid level compensation module, and the self-adaptive liquid level compensation module performs accurate compensation of liquid level data according to physical properties of the liquid, such as temperature, density and viscosity information, so as to improve measurement accuracy;
the compensated liquid level data is sent to a remote monitoring site by the micro control unit through the wireless communication module;
when the liquid level data is lower than or higher than a preset safety range, the micro control unit triggers an alarm signal;
the power module provides stable power support for the whole system.
2. The high-precision liquid level telemetering alarm system according to claim 1, wherein the micro control unit is an ARM Cortex-M series micro control unit, the micro control unit receives and analyzes digital liquid level data from the ultrasonic sensor, performs data interaction between the received liquid physical attribute data and the self-adaptive liquid level compensation module according to the analysis result, controls the wireless communication module to transmit the liquid level data, and meanwhile, monitors the state of the power supply module and gives an alarm when the power supply is insufficient.
3. The high-precision liquid level telemetering alarm system according to claim 1, wherein the micro control unit is connected with the ultrasonic sensor through a digital input/output port, receives digital liquid level data, and transmits the digital liquid level data to the micro control unit through an SPI serial communication interface after the ultrasonic sensor collects liquid level information, and the micro control unit analyzes the digital liquid level data through an analysis algorithm, wherein the analyzed data comprises a liquid level height value, a liquid level change speed in unit time and a liquid level measurement signal-to-noise ratio;
the micro control unit is connected to the self-adaptive liquid level compensation module through a special data channel, and after the micro control unit finishes analyzing the liquid level data of the ultrasonic sensor, the analysis result and the physical attribute data of the liquid are sent to the self-adaptive liquid level compensation module through the special data channel;
the analysis result and the liquid physical attribute data received by the self-adaptive liquid level compensation module are used for liquid level compensation depth calculation, after the compensation depth calculation is completed, the self-adaptive liquid level compensation module sends the compensated liquid level data back to the micro-control unit through the same data channel, and the micro-control unit receives the compensated liquid level data and carries out further data processing or alarm judgment according to the liquid level data.
4. The high-precision liquid level telemetry alarm system of claim 1, wherein the ultrasonic sensor adopts an analog-to-digital conversion technology to convert an analog signal of the liquid level into a digital signal, the analog-to-digital conversion technology is realized by a 16-bit high-precision analog-to-digital converter, the analog-to-digital converter is directly connected with an analog signal output end of the ultrasonic sensor, when the ultrasonic sensor detects liquid level information and generates an analog signal, the signal is input into the analog-to-digital converter, and the analog-to-digital converter ensures that the amplitude of the input analog signal is locked in a short time based on a sample-and-hold technology so as to reduce noise influence in a conversion process;
the analog-to-digital converter adopts the Sigma-Delta conversion principle, through oversampling the analog signal, the noise is removed by using a digital filter, the analog-to-digital converter firstly decomposes the analog signal into a plurality of quantization levels, each level is associated with a specific digital code, and the digital codes are further processed by a Sigma-Delta algorithm to obtain high-precision digital liquid level data.
5. The high-precision liquid level telemetering alarm system according to claim 4, wherein the self-adaptive liquid level compensation module comprises a high-speed digital processing unit and a plurality of sensing input ports, wherein the sensing input ports are respectively used for receiving temperature, density and viscosity data of liquid, and the data are measured by corresponding sensors and transmitted to the self-adaptive liquid level compensation module for processing;
the high-speed digital processing unit comprises a compensation algorithm library which runs in real time, receives the original liquid level data and the liquid temperature, density and viscosity data, and transmits the data to the compensation algorithm library for calculation.
6. The high-precision liquid level telemetry alarm system of claim 5, wherein the compensation algorithm library comprises an adaptive filtering algorithm, liquid level data compensation is performed through the adaptive filtering algorithm, the algorithm dynamically adjusts the liquid level data according to the physical property of the liquid, and compensates measurement errors, and the algorithm is provided withFor the received raw liquid level data, whereThe temperature, density and viscosity of the liquid are expressed separately, and are compensated by the following formula:
7. wherein,is a coefficient determined in advance by experiments, the liquid level data after compensation +.>And then transmitted to the micro-control unit.
8. The high-precision liquid level telemetering alarm system of claim 6, wherein the compensation algorithm library further comprises a neural network model for processing liquid level data with larger deviation from the historical data, the neural network model is trained by the historical experimental data, the depth structure of the neural network model considers the nonlinear relation between the physical property of the liquid and the liquid level, the liquid level compensation is carried out, and the liquid level data processed by the compensation algorithm libraryAnd the final treatment is carried out after the final treatment is carried out by the micro control unit.
9. The high-precision liquid level telemetry alarm system according to claim 1, wherein the wireless communication module comprises Wi-Fi, bluetooth and 4G LTE communication modes, an AES encryption algorithm is adopted to ensure the security of data in the transmission process, and when the micro control unit sends a data request, the wireless communication module encrypts the compensated liquid level data and sends the encrypted liquid level data to a remote monitoring site through a preset communication mode.
10. The high-precision liquid level telemetering and alarming system according to claim 1, wherein the power module combines a solar panel and a high-capacity lithium battery, and adopts an intelligent charge and discharge management system, the system automatically switches a power supply mode according to ambient light conditions, continuous and stable operation of the system is ensured, and meanwhile, the module reports a power state to a micro control unit periodically.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101555609B1 (en) * | 2014-05-08 | 2015-09-24 | 주식회사 포윈 | Apparatus and method for setting filter compensation factors in level measuring instrument |
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| CN2271706Y (en) * | 1995-10-12 | 1997-12-31 | 中国原子能科学研究院 | Intelligent sodium level meter |
| CN202024805U (en) * | 2011-03-13 | 2011-11-02 | 东北石油大学 | Portable non-contact ultrasonic detector for tank boy liquid level |
| CN102840896A (en) * | 2012-09-05 | 2012-12-26 | 中国石油化工集团公司 | Liquid level measuring device |
| KR101555609B1 (en) * | 2014-05-08 | 2015-09-24 | 주식회사 포윈 | Apparatus and method for setting filter compensation factors in level measuring instrument |
| CN104266721A (en) * | 2014-09-24 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Integrated ultrasonic liquid indicator |
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