800 results about "Liquid level measurement" patented technology

The invention relates to the technical field of industrial automation control, in particular to a container liquid level measurement method, system and equipment of a pressure sensor and a medium, and provides a method for eliminating gas phase pressure influence based on a double-sensor differential measurement mechanism and dynamically correcting liquid density and sensor drift errors in combination with a temperature compensation model. The temperature data are linked in real time through a three-dimensional compensation function, density calculation and drift correction are synchronously adjusted, and multi-parameter dynamic decoupling and self-adaptive compensation are achieved; a collaborative measurement mechanism is adopted to integrate bottom and top sensor data, and a built-in temperature probe and a preset threshold are combined to complete multi-source signal fusion and compensation calculation; a dynamic calibration method is designed, and system errors are eliminated through reference pressure point calibration and structure coefficient correction; constructing a closed-loop signal processing flow, and integrating high-precision analog-to-digital conversion, digital filtering and real-time algorithm to output a compensated liquid level value; the method improves the measurement precision and stability, and is suitable for temperature change, gas phase pressure fluctuation and multi-medium scenes.

The invention belongs to the technical field of liquid level measurement and industrial process control, and particularly relates to a radar liquid level meter system fusing an adaptive algorithm and multi-modal data. Comprising a data acquisition unit, a signal acquisition and preprocessing unit, a signal denoising and optimizing unit, a data fusion and anomaly detection unit, a self-adaptive calibration and drift compensation unit and a display and alarm terminal. The system has the advantages that the radar liquid level meter, the auxiliary sensor, signal processing, data fusion, anomaly detection, self-adaptive calibration, drift compensation and other technical means are organically combined, and the system can achieve high-precision and real-time monitoring of the liquid level under the complex working condition.

The invention relates to the technical field of industrial process measurement, and discloses a high-precision liquid level measurement anti-interference calibration method, which comprises the following steps of: 1, synchronously acquiring a liquid level signal, a mechanical vibration signal, an electromagnetic field intensity signal and a temperature distribution signal through a multi-mode sensor array to form multi-physical field data; 2, constructing a hypergraph adjacency tensor based on the coupling relationship of the multi-physics field data, and generating a Laplacian matrix constraint; step 3, performing CP tensor decomposition with hypergraph constraint on an original signal tensor formed by the multi-physical field data, and separating a liquid level signal kernel from an interference kernel; and step 4, inputting the decomposed signal kernel characteristics and the sensor impedance parameters into a depth deterministic strategy gradient algorithm to realize hardware acceleration of a processing flow. A multi-physics field coupling relation is constructed through a hypergraph adjacency tensor and a Laplacian matrix, and the limitation of a traditional binary correlation model is broken through.

The invention discloses a magnetostriction liquid level meter temperature compensation method and system based on a support vector machine. The method comprises the steps that the currently captured original pulse number is obtained through a magnetostriction liquid level meter; the current environment temperature is detected in real time through a high-precision temperature sensor in the magnetostrictive liquid level meter; taking the original pulse number and the current environment temperature as input features, sending the input features to a pre-trained support vector machine regression model (SVM), and outputting a displacement error prediction value in the current temperature environment; and correcting the original measurement result according to the error prediction value to obtain a real pulse measurement value after temperature compensation. The system comprises a time-to-digital conversion chip, a temperature chip temperature measurement module, a support vector machine reasoning module, a pulse compensation module and a distance calculation module. According to the method, nonlinear modeling can be carried out on measurement errors caused by environment temperature changes, so that the liquid level measurement result is dynamically corrected, and the overall robustness and precision of a measurement system are improved.

The invention discloses a motorcycle instrument fuel quantity display calibration method based on multi-sensor fusion. The method comprises the following steps: acquiring a data signal of a sensor, fusing and preprocessing data, calculating a fuel consumption rate by adopting a dynamic self-adaptive fuel consumption model, predicting the remaining fuel quantity, and dynamically adjusting the remaining mileage; and self-adaptive calibration: based on a dynamic self-adaptive fuel consumption model, displaying the remaining fuel quantity, the instantaneous fuel consumption, the average fuel consumption and the estimated endurance mileage by an instrument, and displaying a historical fuel consumption trend in a thermodynamic diagram form. The method has the advantages that multi-sensor data and dynamic environment compensation are fused, the liquid level measurement error is smaller than + / -1%, the endurance prediction error is smaller than + / -5%, the overall oil mass calculation precision is improved to 98%, the DAFCM model supports millisecond-level response, the method dynamically adapts to complex driving scenes, resource occupation is low, the method is suitable for a low-end vehicle-mounted controller, and the method is suitable for large-scale popularization and application. And reliable data support is provided for intelligent travel.

The invention discloses a radar wave measurement method and system for the liquid level of a storage tank, and relates to the technical field of liquid level measurement. The radar wave measurement method for the liquid level of the storage tank comprises the following steps: acquiring radar echo signal data of the storage tank in a set measurement period, and preprocessing the radar echo signal data; based on a pre-trained liquid level identification deep learning model, performing prediction analysis on the radar echo signal data to obtain a liquid level feature set of the storage tank; and acquiring liquid level control parameters of the storage tank, analyzing liquid level control driving indexes of the storage tank in combination with the corresponding liquid level feature set, and controlling the start-stop state of a water pump of the storage tank based on the liquid level control driving indexes. Multi-dimensional modeling is carried out on radar echo signal data in a continuous time period, the limitation that a traditional liquid level measurement method depends on echo signals at a single moment to carry out height judgment is broken through, and the method is particularly suitable for industrial liquid level monitoring requirements with high disturbance and high precision requirements.

The invention relates to the technical field of liquid level detection, in particular to a method for eliminating a false liquid level of a urea hydrolyzer, which comprises the following steps: S1, acquiring a liquid level sensor signal, a pressure sensor signal, a temperature sensor signal and an ultrasonic reflection signal of the urea hydrolyzer in real time; s2, performing weighted fusion to generate fused liquid level characteristic parameters; s3, identifying false liquid level characteristics caused by foam layer coverage or steam interference; s4, generating a calibration liquid level value according to the false liquid level characteristics; and S5, comparing the calibrated liquid level value with a preset liquid level-pressure-temperature relation model, and outputting a real liquid level value. According to the invention, by fusing various sensor signals in real time, dynamically adjusting the parameters of the liquid level sensor and combining the liquid level-pressure-temperature relation model, false liquid level interference is accurately eliminated, the accuracy and reliability of liquid level measurement are improved, meanwhile, the equipment safety is ensured, and abnormal operation caused by false liquid level signals is prevented.

The invention relates to the technical field of liquid ammonia liquid level meters, in particular to a liquid ammonia liquid level meter capable of automatically cleaning impurities and a method thereof.The liquid ammonia liquid level meter comprises a sampling pipe and a floating ball liquid level sensor installed in the sampling pipe, the floating ball liquid level sensor is used for detecting the position of a floating ball and the height of the liquid level, and the floating ball liquid level sensor transmits detection data to a processor; a heat tracing pipe is arranged on the outer wall of the sampling pipe, a flow meter for introducing inert gas is arranged at the upper end of the sampling pipe, and a blow-down valve is arranged at the lower end of the sampling pipe. Whether the floating ball is stuck or not is judged by automatically detecting the position of the floating ball, then cleaning is achieved by heating and nitrogen introduction for purging under the condition that the floating ball is stuck, and due to the integrated automation technology, the accuracy of liquid level measurement of liquid ammonia and the stability of the system are remarkably improved. According to the device, impurities attached to the liquid level meter can be removed in time, the floating ball is prevented from being jammed, and accuracy and reliability of liquid level measurement data are ensured.

The invention relates to the technical field of detection, particularly discloses an ultrasonic guided wave non-contact accurate liquid level measurement method for a high-temperature closed container, and aims at solving the problems that in the prior art, measurement precision is low and interference is prone to occurring in a high-temperature environment. Effective signals are extracted through a self-adaptive interference suppression algorithm, the liquid level is calculated through multi-source data fusion, and an intelligent calibration and self-diagnosis system and a machine learning prediction model are arranged. Experiments show that the measurement error of the method can be controlled within + / -3cm, and the method is remarkably superior to a traditional method and is suitable for accurate liquid level measurement of high-temperature closed containers in the industries of chemical engineering, electric power and the like.

The invention discloses a deep underground space in-situ storage test platform fused with a multi-source measurement and control technology, and relates to the technical field of deep ground science and engineering, the deep underground space in-situ storage test platform comprises a mine wall body, and the underground space of the mine wall body is excavated to form a cavern; a sensing optical fiber is arranged on the surrounding rock wall surface of the cavern and is used for monitoring the pressure and temperature change of the surrounding rock in the storage process; a monitoring hole is formed in the outer side of the periphery of the cavern, a high-density electrical method monitoring assembly is arranged in the monitoring hole, a sealing plate is arranged on an opening of the cavern, a regulation and control module is arranged on one side of the sealing plate, a monitoring module is arranged on one side of the regulation and control module, an oil guide port and a water guide port are formed in the sealing plate, and a liquid level meter is fixedly connected to one side of the sealing plate. The high-density electrical method monitoring assembly is combined with the monitoring module and the regulation and control module, real-time monitoring and regulation and control are conducted on surrounding rock and the environment in the deep underground space storage process, the long-term action mechanism of surrounding rock underground space storage is obtained, and the safety and stability of the storage environment are ensured.

The invention provides a gas-liquid interface identification and ship sloshing liquid level correction method and system, and the method comprises the steps: extracting image edge and gray texture features, achieving the state identification of a liquid-gas interface through a lightweight convolutional neural network model, and dynamically generating a collection strategy according to the state identification; then collecting original liquid level signals and synchronously obtaining IMU data, extracting a multi-mode component through signal decomposition, constructing a disturbance recognition model by combining an IMU, filtering disturbance related components and reconstructing a stable liquid level; and further modeling the disturbance component into a residual sequence, realizing disturbance trend prediction and liquid level dynamic correction by using a time sequence prediction model, and outputting more stable and reliable liquid level data. The problem that liquid level measurement is unstable in the LNG ship sloshing environment can be effectively solved, image recognition and IMU data are fused, liquid level disturbance suppression and dynamic correction are achieved, and the method has the advantages of being self-adaptive, resistant to interference, stable in measurement and the like and is suitable for high-precision liquid level monitoring under the complex working condition.

The utility model discloses a phase modulation water level measuring device of a pumped storage unit, which belongs to the technical field of phase modulation operation liquid level measuring equipment and comprises a high water level connecting pipe, a low water level connecting pipe, a first communicating pipe, a second communicating pipe, a real-time liquid level measuring piece and a tuning fork switch. The upper end of the first communicating pipe is communicated with the high-water-level connecting pipe and the upper end of the second communicating pipe, the lower end of the first communicating pipe is communicated with the low-water-level connecting pipe and the lower end of the second communicating pipe, the tuning fork switch is installed on the first communicating pipe, and the real-time liquid level measuring piece is installed on the second communicating pipe. The first communicating pipe is connected to a draft tube of the pumped storage unit through a high-water-level connecting pipe and a low-water-level connecting pipe to form a first communicating vessel structure, and the second communicating pipe is matched with the first communicating pipe to form a second communicating vessel structure. The technical problem that in the prior art, due to the fact that a floater is prone to impact deformation, measurement accuracy and reliability are limited is effectively solved, and the advantages of being high in measurement accuracy and reliability are achieved.

The invention relates to the technical field of aero-engines, in particular to a lubricating oil tank liquid level detection method, device and equipment, a medium and a program product. The method comprises the steps that the measured liquid level of oil in a lubricating oil tank of the aircraft is obtained, and current attitude information of the aircraft is obtained; the attitude information comprises a pitch angle, a yaw angle and a roll angle; based on a standard corresponding relation, a target standard liquid level corresponding to the current attitude information is determined, and the standard corresponding relation is the corresponding relation between the attitude information and the liquid level of the aircraft when oil in a lubricating oil tank is in a normal state; and determining a detection result based on the size relationship between the target standard liquid level and the measured liquid level. By means of the method, the precision of liquid level measurement of the oil in the lubricating oil tank can be improved.

The utility model provides a hydrogen peroxide storage tank liquid level meter which comprises a liquid level meter body, a protective shell is installed on the outer side of the liquid level meter body, and a plurality of sets of U-shaped visible windows are arranged on the outer side of the protective shell. Connecting pieces are installed at the two ends of the protective shell. According to the liquid level meter, the liquid level meter body is matched with the protective shell, so that the liquid level meter body can be protected, the liquid level meter body is prevented from being damaged due to the fact that the liquid level meter body is collided by the outside in the using process, and the service life of a product is prolonged; according to the liquid level meter, the U-shaped visual window is matched with the protective shell, a user can conveniently observe the liquid level meter body in a multi-direction and multi-angle mode, the sealing performance of the protective shell can be improved through matching of the sealing sleeve, the liquid level meter body and the protective shell, the liquid leakage condition is avoided, and therefore the measurement accuracy of the liquid level meter is improved.

The invention discloses a single-ultrasonic-head sensor for measuring liquid density and liquid level height, which relates to the technical field of liquid level measurement and comprises a floater component, a reflection cavity component and an ultrasonic sensor component. The floater assembly is assembled on the reflection cavity assembly, the reflection cavity assembly is connected with the ultrasonic sensor assembly, and the ultrasonic sensor assembly is connected with the floater assembly through the reflection cavity assembly. High-frequency ultrasonic waves are transmitted and received through a single point, the sound velocity (density) and the ultrasonic wave return time difference (liquid level) are synchronously analyzed, the density and the liquid level of the urea solution are calculated, the problems of mechanical interference and data splitting are avoided, and the trepanning and cable cost is reduced; the shared high-precision temperature compensation module directly eliminates compensation deviation of the split system, and maintenance only needs single-point anti-crystallization treatment; and in combination with a cross validation algorithm (density liquid level logic mutual verification), the operation and maintenance cost is reduced while the data reliability is improved, and the method is particularly suitable for space-limited and highly-corrosive urea solution detection scenes.

The invention relates to a method and system for accurately measuring the liquid level of printing and dyeing sewage. The method comprises the steps that heat distribution information and environment temperature detection data are obtained; correcting the thermodynamic distribution information by using the environment temperature detection data, splitting the corrected thermodynamic distribution information based on a preset splitting and combining rule, and recombining to obtain a plurality of pieces of dispersed thermodynamic distribution information; inputting the dispersed thermal distribution information into a preset rationality analysis model to obtain thermal distribution rationality information; and obtaining a measurement result according to the thermodynamic distribution rationality information. The device has the effect of improving the accuracy of printing and dyeing sewage liquid level measurement.

A method and system for preventing condensation of an ultrasonic liquid level meter. The method comprises: connecting a heat tracing unit to an ultrasonic liquid level meter, and deploying a temperature monitoring module; on the basis of a measurement result of the monitoring module, calculating the dew point of the surface of a probe of the ultrasonic liquid level meter; and comparing the dew point with the surface temperature of the liquid level meter measured by the monitoring module and, on the basis of a heating control execution module, performing dynamic temperature control. By means of deploying the heating unit and the temperature monitoring module, the present invention measures the surface temperature of the probe in real time and, on the basis of the calculated dew point, dynamically adjusts heating power, such that the surface temperature of the probe is higher than the dew point temperature, thus effectively avoiding condensation and solving the effect of environment temperature and humidity on the precision of liquid level measurement.

The utility model discloses a lifting module and an on-site material level simulation device, and belongs to the technical field of material level measurement. The lifting module comprises a rack, a lifting mechanism and a rack leveling assembly, the rack comprises a base and a stand column, and the stand column extends in the vertical direction and is fixed to the base; the lifting mechanism comprises a lifting driving assembly and a lifting platform, the lifting platform is installed on the stand column in a liftable mode, and the lifting driving assembly is used for driving the lifting platform to ascend and descend. The rack leveling assembly comprises a fixing piece and a lifting supporting piece, the fixing piece is fixed to the base, the lifting supporting piece is in threaded connection with the fixing piece and extends in the vertical direction, and the bottom of the lifting supporting piece can abut against the containing face of the base; the at least three rack leveling assemblies are evenly arranged at intervals and used for adjusting the horizontal posture of the base so that the whole lifting module can be kept in the horizontal state. The lifting module is applied to the on-site material level simulation device, overall leveling of the on-site material level simulation device can be achieved, and on-site in-situ calibration precision is improved.

The invention discloses a high-precision liquid level measuring device and method based on sweep frequency interference measurement, belongs to the technical field of optical-mechanical-electrical integrated measurement, and is used for high-precision liquid level measurement. The light path is composed of a frequency sweep correction light path and a measurement calibration light path. The device comprises a sweep-frequency light source, an optical fiber splitter, a high-speed acquisition card, a computer, an optical fiber circulator, an optical fiber reflector, a Fabry-Perot (FP) etalon, a balanced photoelectric detector (BPD), a liquid level measuring probe and the like. The FP etalon realizes a sweep frequency correction function, a measurement calibration light path switches channels through the one-to-two photoelectric switch, and high-speed signal acquisition is carried out through the BPD and the high-speed acquisition card. The measuring process is free of mechanical movement and has the advantage of being free of maintenance; the FP etalon is introduced for nonlinear frequency sweeping calibration, the measurement precision is improved, the micron-level measurement precision can be achieved under the better experiment condition, and the non-contact measurement method can meet the requirement for high-precision liquid level measurement in the fields of chemistry, chemical engineering and the like.

The present disclosure provides a limestone slurry tank liquid level regulation system and method, comprising: a feedforward regulation module, used to monitor the flow signal of recycled water to the limestone slurry tank, predict the change trend of the liquid level of the limestone slurry tank according to the flow signal, and generate a regulation instruction; a liquid level feedback regulation module, used to obtain the real-time liquid level measurement value of the limestone slurry tank, and control the opening of the electric door of the recycled water to the limestone slurry tank according to the deviation between the real-time liquid level measurement value and the liquid level setting value, and perform liquid level regulation; a process water interlock module, used to control the opening or closing of the electric door of the process water to the limestone slurry tank when the liquid level of the limestone slurry tank exceeds a preset threshold range; a logic control module, used to receive the control signals of the feedforward regulation module, the liquid level feedback regulation module and the process water interlock module, and dynamically adjust the liquid level of the limestone slurry tank through logic configuration.

The invention discloses a liquid level sensor device of a pesticide preparation tank, and relates to the technical field of liquid level measurement. The device comprises a first acquisition module for acquiring internal component parameters of a pesticide preparation tank and working condition parameters of a preparation process, and an initial mounting position determination module for determining an initial mounting position of a radar liquid level sensor according to related parameters; after the second acquisition module acquires liquid level data and an original radar signal, the change amplitude calculation module calculates the change amplitude of the stirring speed, and if the change amplitude exceeds a threshold value, the dynamic adjustment module dynamically adjusts the position of the sensor; and the liquid level compensation value generation module generates a compensation value by using a trained liquid level dynamic compensation model of correlation mapping of the stirring speed and the measurement error in combination with the liquid level data, the original radar signal and the working condition parameters, and finally, the dynamic fusion module fuses the initial liquid level data and the compensation value to obtain an accurate liquid level value. According to the method, the accuracy of liquid level measurement in the pesticide preparation process can be effectively improved by dynamically adjusting the position of the sensor and based on multi-parameter dynamic compensation.

The utility model relates to the technical field of liquid level sensing, in particular to a non-contact capacitance liquid level sensor which comprises a cavity outer wall and further comprises a first capacitance plate and a second capacitance plate which are arranged on the cavity outer wall, the first capacitance plate and the second capacitance plate are shortened to form interdigitals, and the interdigitals are arranged in the direction perpendicular to the liquid level change direction. When the liquid level in the cavity rises or falls, the dielectric constant of the liquid is different from that of the air, so that the capacitance value between the interdigital electrodes changes. Liquid level measurement can be achieved by measuring capacitance changes and combining the signal processing module to calculate the corresponding relation between the capacitance and the liquid level. The sensor is mounted on the outer wall of the cavity and does not need to be in direct contact with liquid, so that the problems of pollution, corrosion and mechanical wear of a traditional contact sensor are avoided, and the service life and reliability of the sensor are improved. In addition, the device has the advantages of stable measurement, quick response, high precision and the like.

The invention provides a floating type liquid level switch measuring device, and belongs to the technical field of liquid level measurement. The floating type liquid level switch measuring device comprises a pipeline which is connected with a container for accommodating liquid to be measured; the floating ball assembly is arranged in the pipeline, the strain gauge is arranged in the pipeline, and the strain gauge is connected with the floating ball assembly; the alarm switch piece is arranged in the pipeline, the alarm switch piece corresponds to the strain gauge, when the liquid to be measured in the container is measured, the floating ball assembly moves up and down along with the change of the liquid level of the liquid to be measured, the strain gauge deforms along with the floating ball assembly, and then the alarm switch piece is triggered to act. The suspension type liquid level switch is adopted, the liquid level can be accurately measured outside the liquid level, stable performance can be kept in various severe chemical environments, corrosion of corrosive substances is effectively resisted, the electrode plate does not need to be arranged in the liquid level, and corrosion to the electrode plate is effectively avoided.

The invention provides a liquid level measuring device, a liquid level measuring method and a liquid container, and the liquid level measuring device comprises a sensor which is provided with a stay wire; the rotating component is connected with the other end of the stay wire and is used for rotating by taking a rotating shaft as a center; one end of the connecting rod is fixed to the rotating assembly, and the other end of the connecting rod extends outwards from the rotating assembly; the buoy is connected to the other end of the connecting rod and floats on the surface of the liquid, the buoy moves along with the change of the liquid level of the liquid, the movement of the buoy drives the connecting rod to rotate with the rotating shaft of the rotating assembly as the center, and meanwhile, the movement of the buoy drives the pull wire to generate displacement through the rotation of the connecting rod and the rotating assembly; the processor is electrically connected with the sensor; the sensor is used for converting displacement generated by the stay wire into electric signals, and the processor determines and outputs liquid level data of liquid based on the electric signals. Accurate detection of the liquid level is achieved, tiny changes of the liquid level can be detected, meanwhile, the buoy cannot be wound in the moving process, and product faults are avoided.

The invention relates to a level measuring device (1) for determining a level (L) of a filling material (2), which comprises the following components: - A high-frequency unit (10) for generating and transmitting radar signals (S HF ) along a beam axis (a) towards the filling material (2), and for receiving corresponding reception signals (R HF ) after reflection at the product surface, - an evaluation unit for determining the fill level (L) based on the received signal (R HF ), and - two radar lenses (11, 12) arranged one behind the other in the beam axis (a). According to the invention, the apertures of the radar lenses (11, 12) are selected such that their distance (b 11 + f 12 ) to each other the sum of the image distance (b 11 ) of the first radar lens (11), and the focal length (f 12 ) of the second radar lens (12). This allows the radar signals (S HF , R HF) through a thermally insulating housing neck (131). Furthermore, the inventive design of the apertures within the housing neck (131) allows a radar window (14) serving as explosion protection to be arranged in such a way that the beam guidance is only minimally restricted.

The utility model belongs to the technical field of drainers, and particularly relates to a real-time monitoring and alarming device for a gas drainer, which is characterized in that a gas pipeline and a drainer body are respectively provided with a heat tracing device, so that the upper end of a downpipe and the upper end of an overflow pipe are prevented from being blocked. The first communicating pipe is arranged on the vertical section of the downpipe, the second communicating pipe is arranged on the vertical section of the overflow pipe, and when the downpipe and the overflow pipe are not blocked, water cannot be stored in the first communicating pipe and the second communicating pipe; when the downpipe and the overflow pipe are blocked, accumulated water in the downpipe and the overflow pipe can enter the first communicating pipe and the second communicating pipe respectively, so that the accumulated water is detected by the first liquid level measuring device and the second liquid level measuring device, and the alarm system gives an alarm of blocking at the corresponding position; in addition, whether the liquid level in the drainer body is too low or not is monitored through the third liquid level measuring device, the alarm system can give out an alarm about the sealing problem of the corresponding position, and therefore specific faults of the drainer can be rapidly recognized.

This application relates to an isolated detection system and detection method for the liquid nitrogen liquid level height based on differential pressure calculation. By simulating and calculating the air pressure height difference between the liquid bottom and the liquid surface of the liquid nitrogen tank, a differential pressure signal between the return air pipe 3 and the gas measuring pipe is obtained, and the air pressure height difference between the liquid bottom and the liquid surface of the liquid nitrogen tank is calculated based on the pressure formula, so as to obtain the height position of the liquid nitrogen in the liquid nitrogen tank and perform liquid replenishment control. The differential pressure measurement system is completely isolated from the outside of the liquid nitrogen tank, eliminating the extremely harsh environment inside the tank and ensuring the long-term stable operation of the measurement equipment; the high-precision differential pressure measurement unit can accurately measure the liquid nitrogen height within the range of 1 millimeter, with high precision; only by inserting the gas measuring pipe to the lowest position of the liquid level, the detection of the corresponding range can be automatically matched without adding any circuit, and the measuring range is adjustable; it is suitable for the liquid level measurement of any sealed or unsealed tank or even a tankless situation, avoiding the short circuit of internal electronic equipment and being struck by lightning.

The invention relates to the technical field of circuit board electroplating, in particular to a floating ball linkage type PCB electroplating bath liquid level mechanical adjusting device which comprises an electroplating bath, a switch button, a connecting rod mechanism and a guide rail and further comprises a floating ball, a driving assembly, an annular plate assembly and a protection assembly. The floating ball is driven to rotate through the driving assembly, pitting corrosion caused by the fact that the bottom of the floating ball is still below the liquid level for a long time is avoided, meanwhile, the situation that the weight of the floating ball is affected after electroplating liquid attached to the upper side of the floating ball is condensed into solid is avoided, and therefore the accuracy of liquid level measurement and control of the floating ball is guaranteed; meanwhile, the floating ball is separated from the fluctuating liquid level through the annular plate assembly, so that the influence of liquid level fluctuation on the floating ball is reduced to a certain extent; in addition, protection airflow is formed on the surface, close to the liquid level, of the connecting rod mechanism through the protection assembly, so that the surface, close to the liquid level, of the connecting rod mechanism is dry and clean, and the situation that the liquid level control accuracy of the floating ball is affected due to the weight change caused by condensation of by-products is avoided.

The invention belongs to the technical field of magnesium smelting, and relates to magnesium smelting by an electrolytic method, in particular to an automatic feeding / discharging system of a magnesium electrolytic cell and a use method of the automatic feeding / discharging system. According to the automatic feeding / discharging system, linkage control is carried out on the magnesium layer thickness measuring unit, the magnesium layer liquid level measuring unit, the first electric valve, the second electric valve, the argon assembly, the vacuum assembly and the distributed control system. By changing a traditional manual feeding and discharging mode, the labor amount is reduced, the production efficiency is improved, a large amount of labor force can be saved, personnel posts are saved, energy consumption and capital occupation are reduced, the electrolysis efficiency is improved, the product quality is improved, and the service life of equipment is prolonged; by optimizing the device design, the safety performance and the environmental protection performance of the device are improved, the aims of improving the productivity, saving the energy consumption, improving the product quality, shortening the production time and reducing the safety risk are achieved, and good application prospects are achieved.

A container for pressurized liquid gas, such as LPG or LNG, having an opening leading from outside to inside of the container and having a microwave fluid level sensor mounted on the outside of the container over the opening and configured to emit a microwave beam towards the inside of the container and to receive a microwave beam reflected from the surface of the liquid inside the container. Between the microwave fluid level sensor and the inside of the container there is a lid closing the opening, wherein the lid is made of plastic material capable of transmitting at least a part of the microwave beams.