Intelligent monitoring and automatic metering system for liquid level of petroleum storage tank

Abstract

The utility model discloses a kind of petroleum storage tank liquid level intelligent monitoring and automatic metering system, it is related to petroleum storage tank monitoring technical field, including liquid level detection module, temperature detection module, data storage module, man-machine interactive module, alarm module, wireless communication module, and all be connected with main control module and be controlled by it.Liquid level detection module uses potentiometer to simulate liquid level sensor, real-time acquisition monitors petroleum storage tank liquid level;Adopt DS18B20 digital temperature sensor, real-time acquisition monitors petroleum storage tank temperature;Man-machine interactive module is composed of key module and display module;Alarm module triggers alarm when liquid level, temperature is abnormal.The utility model integrates liquid level detection, temperature detection, automatic metering, data storage, state display, man-machine interaction, abnormal alarm and wireless communication etc. In one aspect, the application provides a method of treating a subject having a cancer, the method comprising administering to the subject an effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt thereof.

Description

Technical Field

[0001] This utility model relates to the field of oil storage tank monitoring technology, specifically to an intelligent monitoring and automatic metering system for oil storage tank liquid levels. Background Technology

[0002] As an important energy resource, the safety and metering accuracy of petroleum storage are crucial to industrial production efficiency and safety. Petroleum tank level monitoring and metering devices can effectively ensure the safe operation of tanks, improve metering accuracy and efficiency, and realize intelligent management and remote monitoring. Therefore, the need to develop a low-cost, high-precision intelligent monitoring and automatic metering system for petroleum tank levels is becoming increasingly urgent.

[0003] However, most current oil storage tanks still rely on manual inspections and mechanical instruments, which suffer from problems such as poor detection accuracy, cumbersome operation, and delayed data response. Existing automated monitoring systems in the industry mostly use high-end chips and complex sensors, which are not only costly but also difficult to maintain, making them difficult to promote and apply in small and medium-sized oil storage tank scenarios. Therefore, there is an urgent need for a new detection solution that integrates multiple core functions, is low-cost, and highly reliable, to solve the problems of liquid level monitoring and automatic metering in small and medium-sized oil storage tanks.

[0004] A comprehensive review of the current status of tank monitoring revealed several potential problems. For instance, Chinese patent CN218724555U discloses an externally attached oil tank level detection device consisting of an externally attached detector and the tank body. When disassembling the probe, the side baffles must be pressed to retract the locking rod. If the spring fails to retract properly due to rust or corrosion, the probe may not be able to be removed from the through slot. Furthermore, relying solely on the spring's rebound force to fix the locking rod can lead to fatigue and loosening of the spring if the tank body vibrates during loading and unloading. This can cause the locking rod to fail to engage with the fixing ring, resulting in loosening and displacement of the measuring probe and calibration probe, leading to detection deviations.

[0005] Chinese patent CN216746340U discloses an integrated mechanical liquid level detection device for oil tanks. Due to its narrow slit design for the flow guide and leakage channel, if the crude oil has a high wax or gum content or the on-site temperature is low, the crude oil will solidify and adhere to the wall inside the tank. This not only fails to achieve flow guidance and drainage, but also increases the weight of the float due to the accumulation of impurities, disrupting the mechanical balance. At the same time, the included angle of the double inclined surface of its float is fixed. When the viscosity of crude oil changes with temperature and composition, the fixed inclined angle cannot adapt to crude oil with different flow characteristics. High-viscosity crude oil will still remain on the inclined surface and cannot completely slide off, which may ultimately affect the detection effect.

[0006] Chinese patent CN119354299A proposes an oil tank level monitoring system and method, comprising an oil tank, a driving component, and at least two capacitive sensors. Analysis reveals the following potential shortcomings of this oil tank level monitoring system: (1) Its driving method relies on the pull rope and gravity block. In the long-term reciprocating motion, there may be risks of the pull rope slipping, tangling and breaking. The gravity block may aggravate the wear of the guide rail. If the motor is powered off or the transmission roller is stuck, the sensor may be stuck in a certain position and unable to complete the liquid level inspection. The system may continuously output incorrect liquid level data. The existing solution lacks an emergency feedback mechanism for drive failure. (2) Its sensors, guide rails and other components are installed on the outside of the oil tank. Although they are easy to disassemble, the maintenance of the high-altitude oil tank requires the erection of scaffolding, and the cleaning and replacement of components in the oily environment is time-consuming and labor-intensive. The replacement frequency of easily damaged parts such as pull ropes and ball bearings is relatively high, and the existing solution lacks a quick disassembly and assembly structure, which will undoubtedly increase maintenance costs and downtime. (3) For oil tanks that have already been put into use, the tank body needs to be welded or drilled when installing limit grooves and guide rails, which may damage the sealing structure of the oil tank and pose a safety risk.

[0007] In summary, this utility model proposes an intelligent monitoring and automatic metering system for oil storage tank liquid levels to meet the current monitoring and metering needs of small and medium-sized oil storage tanks and solve the problems existing in the prior art. Utility Model Content

[0008] The purpose of this utility model is to address the shortcomings of existing technologies and the monitoring and metering needs of small and medium-sized oil storage tanks by providing an intelligent monitoring and automatic metering system for oil storage tank liquid levels. This system can realize real-time monitoring of liquid level and temperature, automatic metering, automatic data storage, abnormal alarm and remote transmission, adapt to the monitoring and metering needs of small and medium-sized oil storage tanks, and improve the intelligence of oil storage tank management.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: An intelligent monitoring and automatic metering system for oil storage tank liquid level is characterized by comprising a main control module, a liquid level detection module, a temperature detection module, a data storage module, a human-machine interaction module, an alarm module, and a wireless communication module. This system enables real-time monitoring and metering of the oil level and temperature within the oil storage tank, and allows for real-time data upload to a cloud platform. The cloud platform then visualizes and stores the data, and issues early warning notifications for abnormal conditions.

[0010] The main control module uses an STC89C52 microcontroller as the core control unit of the system. It is used to complete the initialization configuration of timers, interrupts, and I / O ports, load historical data into RAM and start the interrupt service routine, and periodically execute data acquisition, processing, mode control and peripheral drive logic. Furthermore, the main control module is externally connected to a crystal oscillator circuit and a reset circuit, and is connected to a 9V power supply through an LM7805 voltage regulator chip to achieve 5V power supply.

[0011] The liquid level detection module includes a potentiometer and an ADC conversion unit. The potentiometer simulates a liquid level sensor and can convert and map a 0V to 5V voltage signal into a liquid level percentage of 0% to 100%. It can also calculate the volume change based on the cross-sectional area of ​​the storage tank to complete the real-time acquisition and monitoring of the liquid level. At the same time, the main control module compares the liquid level of the oil storage tank with a preset threshold in real time. When the liquid level is abnormal, it drives the buzzer to start the alarm. Furthermore, the sliding end of the potentiometer is connected to the float mechanism of the oil storage tank. When the liquid level changes, the float mechanism drives the potentiometer shaft to rotate, causing a change in the output voltage signal. Furthermore, the ADC conversion unit uses a PFC8591 chip. By connecting the output of the potentiometer to the AIN0 channel of the PCF8591 chip, the voltage signal is converted from digital to analog by ADC, and then mapped to the percentage of liquid level height after moving average filtering.

[0012] The temperature detection module uses a DS18B20 digital temperature sensor, which is connected to the main control module via a single bus. It updates the temperature data once per second to complete the real-time acquisition and monitoring of the oil storage tank temperature. At the same time, the main control module compares the oil storage tank temperature data with a preset threshold in real time, and drives the buzzer to start the alarm when the threshold is exceeded. Furthermore, the DS18B20 digital temperature sensor has a stainless steel sealed probe, a temperature measurement range of -55℃ to 125℃ and a temperature measurement accuracy of ±0.5℃, and is used to collect the temperature of oil storage tanks.

[0013] The data storage module uses an AT24C02EEPROM chip and is connected to the main control module via an I2C interface. It is used to store at least 3 months of historical monitoring data, including hourly recorded liquid level, temperature, cumulative inflow and cumulative outflow, and ensures that data is not lost when power is off.

[0014] The human-machine interaction module includes a 4×4 matrix button module and an LCD1602A liquid crystal screen display module, which is used to realize the interaction between oil storage tank management personnel and the intelligent liquid level monitoring and automatic metering system. Furthermore, the button module of the human-computer interaction module is a 4×4 matrix button unit, which is connected to the P1 port of the main control module and is used for mode switching (such as storage / output / query) and parameter modification (such as temperature threshold, liquid level reference value and its threshold). Furthermore, the LCD1602A liquid crystal screen is connected to the P2 interface of the main control module through an I2C conversion module, and is used to display the liquid level, temperature, cumulative volume and system status in real time.

[0015] The alarm module drives an active buzzer via an S8050 transistor and is connected to the I / O port of the main control module. When the temperature or liquid level exceeds a preset threshold, the main control module outputs a high level to trigger the S8050 transistor to conduct, causing the active buzzer to emit a pulse alarm signal. At the same time, the LCD1602A screen displays "Temperature too high!" or "Abnormal liquid level!". Furthermore, the buzzer is connected to the P3.5 pin of the main control module via a 100Ω current-limiting resistor and a 1N4148 freewheeling diode for alarm indication when the liquid level or temperature exceeds the limit.

[0016] The wireless communication module uses an ESP8266 WiFi module, which establishes communication with the main control module through a UART serial port. It supports the MQTT protocol and can upload liquid level, temperature and metering data to the cloud platform. It also supports receiving remote control commands from the cloud platform.

[0017] The connection relationships of each module are as follows: the I / O ports of the main control module are connected to the liquid level detection module, temperature detection module, alarm module, and 4×4 matrix keypad module respectively; the data storage module and the LCD1602A LCD screen display module communicate with the main control module through the I2C bus; the wireless communication module is connected to the main control module through the UART serial port.

[0018] An intelligent monitoring and automatic metering system for oil storage tank liquid level, as described above, has the following workflow: After system startup, it automatically initializes the parameters of each module, with the temperature threshold set to 60℃ by default, the liquid level reference value set to 0% by default, and the threshold set to 85% by default; it periodically collects liquid level data (range 0% to 100%) and temperature data (range -55℃ to 125℃), and performs moving average filtering to improve data accuracy; when the liquid level rises, it automatically calculates the increment and adds it to the historical total; when the liquid level falls, it automatically calculates the decrement and adds it to the historical total; it switches between displaying the cumulative stored amount and the cumulative output amount via buttons; when the liquid level or temperature exceeds the set threshold, the buzzer immediately sounds an alarm, and the LCD screen simultaneously displays an alarm prompt of "Abnormal liquid level!" or "Temperature too high!"; real-time data is uploaded to the cloud platform via a WiFi module, and related parameters can be modified remotely.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. Low cost advantage: The system is built using 51 series microcontrollers and general-purpose components, and the overall cost may only be about 1 / 3 of that of other high-end systems, which greatly reduces the application threshold. 2. Multifunctional integration: It integrates functions such as liquid level detection, temperature detection, automatic metering, data storage, status display, human-machine interaction, abnormal alarm and wireless communication into one, which can meet the needs of small and medium-sized oil storage tank scenarios. 3. Easy to upgrade and expand, supporting sensor upgrades (such as replacing with ultrasonic level gauges) and communication protocol expansions (such as adding LoRa protocol), adapting to upgrade needs in different scenarios. Attached Figure Description

[0020] The accompanying drawings described herein are merely illustrative and are intended to further illustrate the present invention. They are part of the present invention and are designed to aid in understanding the present invention. They do not constitute an undue limitation of the present invention. In these drawings: Figure 1 This is a system framework diagram of the intelligent monitoring and automatic metering system for oil storage tank liquid level described in this utility model; Figure 2 This is a schematic diagram of the main control module of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Figure 3 This is a schematic diagram of the liquid level monitoring module of the intelligent monitoring and automatic metering system for oil storage tanks described in this utility model. Figure 4 This is a schematic diagram of the temperature detection module of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Figure 5 This is a schematic diagram of the human-computer interaction module of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Figure 6 This is a schematic diagram of the button layout of the human-computer interaction module of the intelligent monitoring and automatic metering system for oil storage tank level of the present invention. Figure 7 This is a schematic diagram of the alarm module of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Figure 8 This is a schematic diagram of the wireless communication module of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Figure 9 This is a flowchart of the intelligent monitoring and automatic metering system for oil storage tank levels described in this utility model. Detailed Implementation

[0021] To better understand the purpose, technical solution, core functions and implementation principle of this utility model, the present utility model will be further described and explained in detail below with reference to the accompanying drawings and embodiments. However, the described embodiments are only some embodiments of this utility model and do not represent all embodiments.

[0022] like Figure 1 As shown, this utility model provides an intelligent monitoring and automatic metering system for oil storage tank liquid levels. It comprises a main control module, a liquid level detection module, a temperature detection module, a data storage module, a human-machine interaction module, an alarm module, and a wireless communication module. With the main control module as its core, the liquid level detection module monitors the liquid level inside the oil storage tank, the temperature detection module monitors the internal temperature of the tank, and the wireless communication module uploads the monitoring data to a cloud platform for visualization and storage. Simultaneously, the LCD screen displays the monitoring data. If the monitoring data exceeds a set threshold, the alarm module issues a warning, as detailed below: like Figure 2 As shown, the main control module of the intelligent monitoring and automatic metering system for oil storage tank liquid level adopts an STC89C52 microcontroller. Its peripheral circuits include a crystal oscillator circuit and a reset circuit, forming the minimum system of the microcontroller. Pins 18 and 19 are connected to the crystal oscillator (Y1) and a 20pF capacitor to form the crystal oscillator circuit of the microcontroller, providing the working clock for the system. Pin 9 is grounded through a 10k resistor and a 10µF capacitor is connected to VCC, forming the power-on reset circuit. The power supply circuit is composed of an LM7805 voltage regulator chip, with an input voltage of 9V and an output voltage of 5V, which supplies power to the microcontroller and each module. like Figure 3 As shown, the liquid level detection module of the intelligent monitoring and automatic metering system for oil storage tanks includes a potentiometer and an ADC conversion unit. The potentiometer is a 10kΩ type, and its sliding end is connected to the float mechanism of the oil storage tank. When the liquid level in the oil storage tank changes, the float mechanism drives the potentiometer shaft to rotate, causing the sliding end to output a 0V to 5V analog voltage signal. This analog voltage signal is converted from digital to analog by the ADC through the AIN0 channel of the PCF8591 chip in the ADC conversion unit. The converted numerical signal is first filtered by a moving average filtering algorithm to eliminate signal interference, and then the main control module maps the filtered data to a liquid level percentage from 0% to 100%, and calculates the volume change based on the "storage" or "output" mode and the preset tank cross-sectional area A. (where A is the cross-sectional area of ​​the storage tank), and then update the historical total inflow or historical total outflow in real time; like Figure 4As shown, the temperature detection module of the intelligent monitoring and automatic metering system for oil storage tank liquid level adopts the DS18B20 digital temperature sensor. The DQ pin of the sensor is connected to the P2.0 port of the main control module through a single bus. At the same time, a 10kΩ pull-up resistor is connected in series between the DQ pin and the 5V power supply terminal in the circuit. The sensor probe is made of stainless steel, which is explosion-proof and corrosion-resistant, and is installed inside the oil storage tank at the preset temperature measurement point. After power-on, the temperature detection module automatically enters the temperature measurement mode, monitors the temperature of the oil storage tank in real time, and transmits the monitoring data directly to the main control module. Its temperature measurement range covers -55℃ to 125℃, and the accuracy can reach ±0.5℃ in the range of -10℃ to +85℃. like Figure 5 As shown, the display module of the intelligent monitoring and automatic metering system for oil storage tank liquid level uses an LCD1602A liquid crystal display screen, which is connected to the P0 port of the main control module through a PCF8571I2C adapter module. Simultaneously, the RS, RW, and E pins of the LCD are connected to the P1.0, P1.1, and P1.2 pins of the microcontroller, respectively, enabling the main control module to send commands and transmit data to the display screen. The LCD screen backlight uses an adjustable resistor to control the contrast, allowing manual adjustment of the screen contrast. A PWM dimming circuit is also designed to adapt to different lighting environments. The display screen shows data in two lines: the first line displays the real-time liquid level and temperature, and the second line displays the historical total input and output, facilitating direct reading by oil storage tank management personnel. like Figure 6 As shown, in the intelligent monitoring and automatic metering system for oil storage tank liquid level, k1, k2, and k3 of the button module are connected to P1.3, P1.4, and P1.5 of the microcontroller, respectively, and the other end is grounded to form a low-level triggered button circuit. The mechanical jitter is eliminated by combining software delay and state machine. After the button is pressed, there is a 10ms delay before detection, and the system responds after confirming that the state is stable. The buttons can realize human-computer interaction functions such as mode switching, parameter query and modification. like Figure 7 As shown, the alarm module of the intelligent monitoring and automatic metering system for oil storage tank liquid level uses a 5V active buzzer. The base of the S8050 transistor is connected to the P2.1 pin of the main control module through a current-limiting resistor, the collector is connected to one end of the buzzer, the other end of the buzzer is connected to a 5V power supply, and the emitter is grounded, forming a buzzer drive circuit. When the main control module detects that the temperature in the oil storage tank exceeds the limit or the liquid level is abnormal, the main control module outputs a high level to trigger the transistor to conduct, and the buzzer emits a pulse alarm signal to remind the oil storage tank management personnel to deal with it in time. like Figure 8As shown, the wireless communication module of the intelligent monitoring and automatic metering system for oil storage tank liquid level adopts the ESP8266 WiFi module. The TX and RX pins of the ESP8266 are cross-connected to the RX and TX pins of the serial port of the main control module, respectively, to realize serial communication with the main control module. After the system is powered on, the main control module sends an initialization command to the ESP8266 to complete the configuration of parameters such as serial port baud rate, WiFi name and password, and MQTT server address. After connecting to the designated WiFi network and MQTT server, it subscribes to relevant control command topics, encapsulates system data and publishes it to the designated data topic to realize data transmission with the cloud platform. like Figure 9 As shown, the program workflow of the intelligent monitoring and automatic metering system for oil storage tank liquid level is as follows: After the main control module is powered on, it sequentially completes the parameter configuration of the timer, interrupt controller, I / O port, display module and data storage module; synchronously, it loads the historical liquid level data, historical temperature data and threshold parameters stored in the data storage module into RAM for subsequent calls; after completing the peripheral configuration, the main control module starts the timer interrupt, triggers the initialization of liquid level measurement and temperature measurement, and puts the system into the monitoring state; The main control module executes the main loop program according to a preset cycle. The core execution includes: periodically scanning the input status of the button module and triggering corresponding function operations based on the button module commands; real-time acquisition of liquid level and temperature monitoring data through interrupt service routines, with the main program reading the acquired data and performing filtering, conversion, and other processing; updating the output content of the display module according to the current system operating mode and presenting the monitoring data in real time; comparing real-time temperature and liquid level data with preset thresholds, and immediately driving the buzzer to sound an alarm when the liquid level or temperature exceeds the threshold; and automatically writing the updated parameters to the data storage module when the system switches operating modes or modifies parameters, ensuring data is not lost even when power is off. The voltage signal from the liquid level detection potentiometer is acquired by the ADC conversion unit of the liquid level detection module, and the liquid level height is calculated in real time according to the preset voltage-liquid level conversion formula. After filtering the calculation results, the current liquid level data is updated according to the current "store" / "output" / "query" mode of the system. The internal temperature of the oil storage tank is acquired in real time using a DS18B20 digital temperature sensor to achieve real-time temperature data updates. When the temperature and liquid level exceed the threshold, the system immediately triggers an alarm mechanism. The system supports three working modes: "Storage", "Output", and "Query". When the button module is in "Storage" mode, the incremental data caused by the increase in liquid level is automatically added to the total parameter. When it is in "Output" mode, the incremental data caused by the decrease in liquid level is automatically deducted from the total parameter. When it is in "Query" mode, the output content of the display module can be switched by using the up and down buttons to query the total liquid level, temperature data, and threshold parameter information. After the parameter is modified, the display module immediately updates the displayed content and writes the modified parameter to the data storage module to save the data. The wireless communication module sends real-time liquid level and temperature data to the cloud platform according to a preset data format; oil tank managers can remotely view the oil tank monitoring data through the cloud platform to achieve remote monitoring of the oil tank liquid level and temperature.

[0023] The above are merely preferred embodiments of this utility model, not all embodiments, and are not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A smart monitoring and automatic metering system for oil storage tank liquid level, characterized in that: It includes a main control module, a liquid level detection module, a temperature detection module, a data storage module, a human-machine interaction module, an alarm module, and a wireless communication module; The main control module uses an STC89C52 microcontroller as the core control unit of the system. It is used to complete the initialization configuration of timers, interrupts, and I / O ports, load historical data into RAM and start the interrupt service routine, and periodically execute data acquisition, processing, mode control and peripheral drive logic. The liquid level detection module includes a potentiometer and an ADC conversion unit, which can convert and map 0V to 5V voltage signals into liquid level percentages of 0% to 100%, and can calculate volume variables based on the cross-sectional area of ​​the storage tank to complete real-time acquisition and monitoring of the liquid level. The temperature detection module uses a DS18B20 digital temperature sensor to collect real-time temperature data of the oil storage tank. The data storage module uses an AT24C02EEPROM chip to store historical monitoring data, threshold parameters, and system configuration information, and ensures that data is not lost when power is off. The human-machine interaction module includes a 4×4 matrix button module and an LCD1602A liquid crystal screen display module, which is used to realize the interaction between oil storage tank management personnel and the intelligent liquid level monitoring and automatic metering system. The alarm module drives an active buzzer via an S8050 transistor for early warning notification of abnormal conditions in oil storage tanks. The wireless communication module uses an ESP8266 WiFi module to send real-time monitoring data to the cloud platform in a preset format, enabling remote transmission.

2. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The liquid level detection module uses a potentiometer to simulate a liquid level sensor. The sliding end of the potentiometer is connected to the float mechanism of the oil storage tank. When the liquid level changes, the float mechanism drives the potentiometer shaft to rotate, causing a change in the output voltage signal. The ADC conversion unit uses a PFC8591 chip to acquire the voltage signal corresponding to the liquid level and convert it into a numerical signal. After being filtered by moving average, the signal is mapped to the percentage of the liquid level height, thereby completing the real-time acquisition and monitoring of liquid level data.

3. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The temperature detection module is connected to the main control module via a single bus and updates the temperature data once per second. The main control module compares the temperature data with a preset threshold in real time, and drives the buzzer to start an alarm when the threshold is exceeded.

4. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The human-computer interaction module's button module is a 4×4 matrix button unit, used for mode switching and parameter modification. The system supports three working modes: "Storage", "Output", and "Query". In the "Storage" mode, the incremental data generated by the increase in liquid level is automatically included in the total quantity parameter; in the "Output" mode, the incremental data generated by the decrease in liquid level is automatically deducted from the total quantity parameter; in the "Query" mode, the output content of the display module can be switched by pressing the buttons to realize the query of liquid level, temperature data, and threshold parameters. The display module of the human-machine interaction module adopts an LCD1602A liquid crystal screen, which communicates bidirectionally with the main control module and can update the display of total liquid level, temperature, threshold and system working status in real time according to the current working mode.

5. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The data storage module is connected to the main control module via an I2C bus and stores at least three months of historical data, including hourly records of liquid level, temperature, cumulative inflow, and cumulative outflow, and the data is not lost after a power outage.

6. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The alarm module is connected to the I / O port of the main control module. When the temperature or liquid level exceeds the preset threshold, the main control module outputs a high level to trigger the transistor to conduct, causing the buzzer to emit a pulse alarm signal. At the same time, the LCD1602A displays "Temperature too high!" or "Liquid level abnormal!".

7. The intelligent monitoring and automatic metering system for oil storage tank liquid level according to claim 1, characterized in that: The wireless communication module is connected to the main control module via a UART serial port and supports the MQTT protocol. It can upload real-time liquid level, temperature, cumulative stored amount, and cumulative output amount to the cloud platform, and supports remote modification of temperature threshold, liquid level reference value and its threshold parameters through the cloud platform.

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