771results about "Level indicators by floats" patented technology

The utility model relates to the technical field of magnetic floater liquid level meters, in particular to a visual magnetic floater liquid level meter display device which comprises a body pipe, two bypass liquid guide pipes arranged on the rear side of the outer wall of the body pipe, an upper blocking cover arranged at the top of the body pipe, a flange lower cover arranged at the bottom of the outer wall of the body pipe and a turning plate box arranged on the front side of the body pipe. A magnetic turning plate indicator and a graduated scale are arranged on the front side of the turning plate box, a frame-shaped butt joint groove is formed in the front side of the outer wall of the turning plate box, a protective cover is arranged at the frame-shaped butt joint groove in a sleeving mode, and a transparent acrylic plate is arranged on the front side of the protective cover in a penetrating mode. According to the visual magnetic floater liquid level meter display device, the replaceable protective cover is designed, when the transparent acrylic plate is damaged or affected by dirt, a user does not need to replace the whole device or carry out complex cleaning, only the protective cover needs to be replaced, maintenance complexity and time cost are greatly reduced, and the visual magnetic floater liquid level meter display device is convenient to use. And the maintainability and the service life of the equipment are improved.

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.

A sensing assembly for use in a piezoelectric liquid level sensor. The sensing assembly comprises: a first piezoelectric sensing module arranged on a magnetostrictive wire and adapted to receive an ultrasonic guided wave signal propagating along the magnetostrictive wire; a second piezoelectric sensing module arranged on the magnetostrictive wire and spaced apart from the first piezoelectric sensing module; and an isolation layer arranged on the magnetostrictive wire between the first piezoelectric sensing module and the second piezoelectric sensing module and adapted to block the ultrasonic guided wave signal from propagating to the second piezoelectric sensing module. Using the sensing assembly, the liquid level of the oil in the tank can be calculated precisely under a strong vibration noise.

The application discloses an oil level sensor for oil tank oil quantity detection, which comprises a sealing plate, a mounting table integrally formed on the upper surface of the sealing plate, a liquid level sensor and a float oil quantity sensor fixed on the lower surface of the mounting table, a connecting rod rotatably arranged on the lower surface of the float oil quantity sensor, a hollow float ball fixed on the lower end of the connecting rod, a positioning pipe arranged in the hollow float ball and fixed on the inside of the positioning pipe, a limiting hole arranged in the center of the hollow float ball, trumpet mouths arranged on both ends of the limiting hole, a limiting rod arranged in the limiting hole, a connecting rod fixed on the upper end of the limiting rod and a limiting plate arranged on the lower end of the connecting rod. The application improves the structure of the float in the existing oil level sensor, can make the float have a larger measuring range, improve the measuring precision of the oil level, can limit the measuring path of the float, and can keep the oil level sensor for a long time of accurate measurement without frequent maintenance, so it is suitable for wide popularization and application.

The invention provides a reservoir water rain condition monitoring system and a monitoring method, the system constructs a dual monitoring system of physical observation reference and electronic automatic acquisition, a customized stainless steel water gauge and a multi-element acquisition device are deployed on key sections of a reservoir dam and a drainage basin, and a front-end edge calculation module is utilized to invert the flow in real time. And after the data is transmitted to the cloud platform, intelligent management and control are carried out through the four-pre functional module. The system displays the watershed situation based on a GIS graph, integrates an online flow measurement algorithm to generate a water and rain condition process line in real time, and realizes visual supervision by combining video monitoring and OSD data superposition. The core multi-target optimization scheduling model comprehensively considers flood control safety and power generation benefits, generates an optimal scheduling scheme through simulation deduction, and provides a closed-loop control interface. The problems of low monitoring precision, scheduling decision lag and the like in the prior art are solved, and the automatic management level and the water resource utilization rate of the reservoir group are remarkably improved.

The invention discloses an intelligent temperature control anti-crystallization magnetic turning plate liquid level meter and a solution storage tank, the equipment comprises a measuring cylinder, the outer side of the measuring cylinder is sleeved with a constant-temperature jacket, the constant-temperature jacket is internally provided with a constant-temperature cavity, and the constant-temperature cavity is filled with a heat-conducting medium; the floater is connected into the measuring cylinder in a sliding manner, and a corrosion-resistant coating is arranged on the floater; the pull rod is also slidably connected in the measuring cylinder, the bottom of the pull rod is connected with a scraping plate, and the scraping plate is located above the floater and abuts against the inner wall of the measuring cylinder; the turning plate is arranged on one side of the measuring cylinder, and the end part of the turning plate extends into the measuring cylinder and is movably connected with the scraping plate; the remote transmission rod is arranged on one side, close to the measuring cylinder, of the turning plate; the circulating liquid upper communicating pipe is arranged on one side of the top of the measuring cylinder; the circulating liquid lower communicating pipe is arranged on one side of the bottom of the measuring cylinder; the conical crystal collecting tank is arranged below the measuring cylinder, a vibration motor and a urea solution lower communicating pipe are arranged on the conical crystal collecting tank, and a pressure transmission is arranged on the urea solution lower communicating pipe.

In a method for continuously supplying a metering device with different batches of one and the same liquid medium, a progressive addition of the medium of a new batch takes place during a batch change.

The invention relates to the technical field of measurement, in particular to a float-type water level gauge dynamic compensation detection method which comprises the following steps: collecting float angle sequence data; synchronously acquiring environment disturbance parameters; calculating the floater angle sequence data to obtain a preliminary water level value; constructing a dynamic compensation model, and outputting an inertia force correction term, a fluid damping correction term and a mechanical hysteresis correction term; the inertia force correction term, the fluid damping correction term and the mechanical hysteresis correction term are multiplied by corresponding weight factors respectively, then algebraic sum is solved, a total compensation amount is obtained, and the weight factors are dynamically adjusted and normalized according to the current wave high energy spectral density, the wind speed gradient change rate and the water temperature viscosity correction coefficient; and deducting the total compensation amount from the initial water level value, and outputting a final compensated water level value. According to the method, the problems of poor multi-physical field sensing capability and poor online parameter identification capability of a compensation method in the prior art are solved.

The invention discloses an anti-magnetic interference magnetic flap liquid level meter, and relates to the technical field of magnetic flap liquid level meters, the anti-magnetic interference magnetic flap liquid level meter comprises a main pipeline and a blow-down valve in flange connection with the bottom end of the main pipeline, the front surface of the main pipeline is fixedly provided with a magnetic flap indicator, the inner wall of the main pipeline is symmetrically provided with slide rails, and the slide rails are slidably connected with slide blocks; the number of the sliding blocks is two, a magnetic floater is fixedly installed between the two sliding blocks, and a plurality of rolling wheel installation grooves are formed in the ends, close to the sliding rails, of the sliding blocks. By arranging a totally-closed electromagnetic shielding structure, interference of an external strong magnetic field is effectively blocked, it is ensured that magnetic coupling between the magnetic floater and the turning plate is stable, and the problems of false operation of the turning plate and display misalignment are solved; meanwhile, the combination of the sliding rail and the sliding block with the rolling wheel is adopted, the magnetic floater is restrained to move only in the vertical direction, the rolling, collision and jamming risks of the magnetic floater during medium boiling are reduced, the magnetic synchronism stability is maintained, and the problems of floater instability and indication distortion are solved in a targeted mode.

To provide a flood monitoring device, a flood monitoring system and a flood monitoring method with which it is possible to calculate the water depth and stream speed of rivers with good accuracy, without using expensive sensors.SOLUTION: The present invention comprises: an acquisition unit that acquires a captured image having been captured by an imaging device that captures the image of a buoy on the water surface among buoy-type sensors having a buoy floating on a river and an unwinding mechanism that is connected to the buoy by a connecting line and capable of unwinding and pulling back the connecting line, and that is fixed to the bottom or near the bottom of the river; and a first calculation unit that derives, from the captured image, the horizontal displacement of the buoy from the water surface position in a direction perpendicular to the unwinding mechanism and the submerged state of the buoy, and calculates the water depth and stream speed of the river on the basis of the displacement, the submerged state, and a first relationship of balance of forces and tensions due to the gravity, buoyance and stream acting upon the buoy.SELECTED DRAWING: Figure 2

This liquid level sensor 1 includes: a sleeve 2 that is provided in a vertical direction; a float 3 that moves along the sleeve as a liquid level fluctuates; a resistance row 4; a plurality of grounding means 5 that are provided inside the sleeve; and a liquid level signal output means 6 that extracts, as a liquid level signal that is a signal corresponding to the liquid level, an electric signal detected between a positive electrode side end part 4a and a connection part grounded by the grounding means 5, and further includes a warning signal output means 7 that outputs a warning signal when the float 3 is located within a predetermined distance from a warning position that is a predetermined position within a movable range of the float 3. Accordingly, a compact and highly reliable liquid level sensor is achieved.

The utility model discloses a liquid level observation device for a harbor type pump pool, and relates to the technical field of liquid level observation. The device comprises a bottom plate, a protection mechanism and a configuration mechanism are arranged on the bottom plate, and the protection mechanism comprises a plurality of clamping plate sets fixedly connected to a top plate of the bottom plate. By arranging the protection mechanism, in the process that the floating block floats along with the water surface, the filter screen on the outer side of the floating block can effectively intercept impurities on the water surface and prevent the impurities from winding or blocking the floating block, the accuracy of water level measurement is guaranteed, and if the filter screen is blocked due to long-term use and needs to be cleaned, the indication blocks on the two sides can be pulled outwards to prevent the floating block from being blocked. The indicating block slides along the outer wall of the first sliding rod, meanwhile, the spring on the first sliding rod is compressed, the spring accumulates energy so that follow-up resetting can be facilitated, limiting of the filter screen is relieved along with outward movement of the two clamping blocks, at the moment, the filter screen can be pulled out by means of sliding of the filter screen in the multiple clamping plate sets, and therefore the filter screen can be conveniently cleaned or replaced.

This application discloses a water level monitoring device, comprising: a support frame with its bottom disposed at the bottom of the water area to be measured; and a measuring end fixed to the support frame. The measuring end includes a float assembly and a measuring rod. The float assembly is disposed within the hollow structure of the measuring rod. The float assembly moves within the measuring rod due to changes in the buoyancy of the liquid in the water area. This application allows for direct observation of changes in the liquid level in the water area by measuring this movement distance, effectively avoiding errors caused by liquid level fluctuations, human error, or probe blockage, thus improving monitoring accuracy. Furthermore, the water level monitoring device provided by this application is easy to install and use, has low operational difficulty, and wide applicability.

The invention discloses a desktop type water bath high-low temperature exchange device capable of automatically replenishing water, which relates to the field of laboratory test equipment and comprises a high-temperature pool, a low-temperature pool and a sample transfer mechanism arranged between the high-temperature pool and the low-temperature pool, the high-temperature pool and the low-temperature pool are each provided with one automatic water supplementing system, and each automatic water supplementing system comprises a detection unit used for detecting the water level, a controller and a water supplementing execution unit controlled by the controller. According to the automatic water supplementing system, through the synergistic effect of the detection unit, the controller and the water supplementing execution unit, precise closed-loop control over the water level of the high-low-temperature water pool is achieved. The system can monitor the water level change in real time, automatically complete water replenishing operation, ensure that the water level is always maintained in a preset range in the whole experiment process, realize long-time unattended continuous testing, and improve the automation degree and the operation reliability of equipment.

The utility model discloses a novel side-mounted magnetic liquid level metering device, which relates to the technical field of liquid level metering devices and comprises a shell, a mounting mechanism is arranged on the shell, the shell is mounted on an external container through the mounting mechanism, a cavity is arranged in the shell, a liquid inlet pipe communicated with the cavity is fixed at the bottom of the shell, and a liquid outlet pipe communicated with the cavity is fixed at the bottom of the shell. According to the novel side-mounted magnetic liquid level metering device, after liquid level metering is completed, the end opening of the branch pipe is plugged through the sealing plug, the miniature air pump works and injects air into the cavity, the air pressure in the cavity rises, liquid in the cavity is pressed, the liquid in the cavity is separated from the branch pipe, the liquid in the cavity is separated from the branch pipe, and the liquid in the cavity is separated from the branch pipe. The liquid in the cavity flows back to the external container through the liquid inlet pipe under the action of air pressure, so that after measurement is completed, the liquid in the cavity can automatically flow back to the container to be measured, and the liquid is prevented from being wasted.

The utility model relates to the technical field of geotechnical engineering, in particular to a geotechnical engineering investigation water level measuring device, which is provided with a vehicle body bracket structure with a vertical adjustment function, so that the detection precision can be improved through adjustment, and the reliability is improved; comprising a water level tester, and further comprises a frame, steering shafts, wheel boxes, rolling wheels, movable ball sleeves, jacking screw sleeves, jacking screw rods, jacking screwing handles, movable balls, sliding sleeves, a bubble level and a surveying pipe, the front portions and the rear portions of the bottom ends of the two sides of the frame are rotationally connected with the middles of the top ends of the wheel boxes through the steering shafts respectively, and the rolling wheels are rotationally arranged on the inner sides of the wheel boxes respectively; the inner wall of the movable ball sleeve is movably connected with the outer wall of a movable ball, a sliding sleeve is arranged in the movable ball, one side of the outer end of the sliding sleeve is further connected with a bubble level, and the inner side of the sliding sleeve is slidably connected with the outer side of a surveying pipe. The water level measuring instrument is installed in the surveying pipe.

The utility model provides a magnetic type liquid level meter light-emitting panel which comprises a measuring cylinder, the measuring cylinder is fixedly sleeved with two hoops, a display support is fixedly arranged in front of the two hoops, a light-emitting assembly is arranged at the front end of the display support, and a light reflecting assembly is arranged on one side of the display support. The light-emitting panel can be disassembled and assembled, the internal lamp body is protected, meanwhile, the light-emitting panel can be rapidly turned on to replace and maintain the lamp body, and the problems that the difficulty is high and the workload is large when internal lamp beads are replaced and maintained are solved.

The utility model discloses a floating ball type liquid level measuring device, and relates to the technical field of liquid level measuring devices. The utility model provides a floating ball type liquid level measuring device which comprises an inserting rod, two conducting rods extending in the axial direction of the inserting rod are arranged in the inserting rod, a conducting connecting block is arranged between the two conducting rods, and a first magnetic attraction piece is arranged on the conducting connecting block; a floating ball assembly; the first floating ball and the second floating ball are provided with oppositely-arranged clamping grooves, and the two clamping grooves are buckled to form a limiting groove used for being matched with the inserting rod. The floating ball assembly further comprises connecting units arranged on the two sides of the limiting groove, each connecting unit comprises a connecting shaft, the connecting shafts are sleeved with second magnetic attraction pieces used for being matched with the first magnetic attraction pieces, the first ends of the connecting shafts are hinged to one of the first floating ball and the second floating ball, and the other floating ball is provided with a spring bolt. The second end of the connecting shaft is provided with a locking piece, and the locking piece is provided with a lock hole used for being matched with the spring bolt to form a limiting structure.

The utility model discloses a water flow intelligent regulation and control device for water conservancy facilities belongs to water conservancy engineering technical field, including the water dike, the fixed plate is fixedly connected with the water dike inner wall, and the fixed plate is fixedly connected with the main gate component between two, and one of fixed plate top is provided with the regulation and control mechanism, the vice gate is provided in the main gate component, the water dike top fixedly connected with the mounting bracket, the mounting bracket top is provided with the drive mechanism, the vice gate is driven and moves up and down through the drive mechanism, the inside of water dike is provided with the water level monitoring mechanism, the one side of mounting bracket is provided with the controller, the utility model discloses the cooperation of the main gate component and the vice gate that are set up can realize multiple water flow regulation and control mode, can according to different river water flow demand, accurate regulation flow and water level, and the staff is convenient to manage and operate, and the work efficiency is improved.

The invention discloses a mine water level monitoring device with a desilting function, which relates to the technical field of water level monitoring and comprises a monitoring machine body, a monitoring rod, an upper sleeve, a lower sleeve, a buoyancy plate, a sliding mechanism, a magnetic mechanism and a stirring mechanism. The monitoring machine body is installed in a reservoir through an installation part, an intelligent detection sensor module is arranged in the monitoring machine body, the monitoring rod is fixed to the lower portion of the monitoring machine body and inserted into the reservoir, the upper sleeve and the lower sleeve are arranged on the monitoring rod in a spaced mode, and the buoyancy plate is movably installed on the peripheral side of the sleeve. The sliding mechanism opens a lower sleeve water suction port and is in butt joint with the magnetic mechanism; during water pumping, high-pressure water flow impacts the turbine, the magnetic mechanism drives the buoyancy plate to rotate, the stirring mechanism synchronously acts to reduce friction force, the stirring piece is unfolded to stir water in the reservoir, and sludge is mixed in the water and discharged along with drained water, the device achieves synchronous water level monitoring and dredging, manual dredging is not needed, and the labor cost is saved; and stable operation of monitoring equipment is ensured.

The invention discloses a water level measurement data processing method. The method comprises the steps of collecting a water level measurement value of a monitoring point at a target moment; when the water level measurement value is higher than a preset threshold value, alarm information is generated, and the alarm information comprises the target moment and the water level measurement value; and sending the alarm information to a network management server. The method has the advantages that the network management server does not need to judge whether the water level measurement value has risks or not on the server, the processing process of the water level measurement value is reduced, the network management server only receives data with risks, and operators can conveniently analyze and process abnormal data in time.

The utility model discloses a pool liquid level detection device convenient to install, which comprises a floating ball type liquid level meter and a pool body, the upper end of the floating ball type liquid level meter is fixedly connected with a fixed disc, and an annular clamping groove is arranged among the periphery of the fixed disc. Through the arrangement of the pin column, the inserting hole, the supporting spring and the pin groove, the rotating direction of the vertical plate, the rotating disc and the guide groove can be limited, meanwhile, a worker can operate the vertical plate, the rotating disc and the guide groove to rotate conveniently in the installation process of the floating ball type liquid level meter and the pool body, and under the action of rotation of the guide groove, the vertical plate, the rotating disc and the guide groove can be fixed conveniently. The L-shaped clamping rod can be inserted into the annular clamping groove in the fixing disc, and the floating ball type liquid level meter, the fixing disc, the annular frame, the conducting pipe and the pool body can be locked and limited in the installation process, so that the purpose of rapidly installing and fixing the floating ball type liquid level meter is achieved, the overall operation is simple and rapid, and the installation efficiency is improved. And the installation operation efficiency of personnel is effectively improved.

The utility model relates to the technical field of water level monitoring for hydraulic engineering, in particular to a water level monitoring device for hydraulic engineering, which comprises a mounting seat, a water level monitoring mechanism and a water level sensor. The enclosure mechanism comprises an enclosure cylinder fixedly connected to the top end of the mounting base, the lower end of the surface of the enclosure cylinder is rotationally connected with a filter cylinder, and the lower end of the surface of the filter cylinder is rotationally connected to the top end of the mounting base; according to the device, the water level monitoring mechanism is enclosed through the enclosing cylinder and the filter cylinder, and compared with an existing mode that impurities are easily attached to the top end of a floating layer and a touch switch is easily touched by mistake, the mode prevents the impurities in water from being attached to the end of the floating plate ruler, so that the situation that the floating plate ruler touches the switch by mistake is avoided; large impurities are prevented from being attached to the surface of the filter cylinder through the multiple stop levers, the probability that the filter cylinder is blocked is reduced, and then the amount of water flowing into the surrounding cylinder is guaranteed.

The utility model discloses an intelligent pneumatic precipitation device for water level control, which relates to the technical field of pneumatic precipitation equipment and comprises a precipitation device main body, a limiting sleeve is mounted on the side wall of the precipitation device main body, a limiting rod is mounted on the inner wall of the limiting sleeve, and a floating plate is mounted on the outer wall of the limiting rod. A touch sensor is installed at the bottom of the limiting sleeve, and an air inlet pipe is installed at the top of the water lowering device body. By means of the limiting sleeve, the limiting rod, the floating plate and the touch sensor, a traditional pneumatic precipitation device can continuously operate after being started, the device can idle when the water level is lower than a water inlet and potential safety hazards exist when the device is unattended, the floating plate of the device can slide downwards along with the water level, and when the floating plate descends to the bottom, the floating plate can slide downwards along with the water level. When touching a touch sensor, the equipment can be turned off, idle running is avoided, manual guarding is not needed, and the practicability is higher.

The utility model relates to the technical field of preparation equipment, and provides a liquid level detection device of a flotation machine, which comprises a flotation main body provided with a flotation tank, and the flotation tank is sequentially divided into a foam area and an ore pulp area from top to bottom; the detection pipe is statically arranged relative to the flotation body and connected with the ore pulp area through a first valve, and the first valve is used for controlling the communication relation between the detection pipe and the ore pulp area. The floating block is movably arranged in the detection pipe; the height detection piece is arranged on the detection pipe and used for detecting the height position of the floating block. By means of the technical scheme, the problems that in the prior art, due to the fact that a detection device is arranged in a flotation equipment tank body, foam is prone to adhering to the detection device, the requirement for high-precision online detection of the liquid level cannot be met, and overhauling steps are tedious are solved.

The invention belongs to the technical field of oil level monitoring of transformer oil conservators, and discloses an oil level monitoring device of an oil conservator, a using method and the oil conservator, the monitoring device comprises a corrugated core body arranged in the oil conservator, a monitoring stand pipe is arranged beside the corrugated core body, the edge of the top of the corrugated core body is connected with a magnetic ring, and the magnetic ring is arranged outside the monitoring stand pipe in a sleeving mode; a monitoring circuit is arranged in the monitoring riser and comprises a power supply, a resistor string and a magnetically controlled switch, one end of the resistor string is connected with the power supply, and the other end is connected with an output end; the resistor string comprises a plurality of resistors which are connected in series; the output end of each resistor is connected with the output end through a magnetically controlled switch; the magnetic control switches are arranged at different heights in the monitoring vertical pipe in the vertical direction. The output end is connected with a resistance measuring device. The technical problem that oil level monitoring is inconvenient due to the fact that the oil conservator is affected by the installation height is solved, and real-time monitoring of the oil level of the corrugated inner oil type oil conservator is achieved.

The utility model discloses an automatic defoaming system for an evaporation tower, which comprises the evaporation tower and a controller, a feed liquid pipeline, a heating steam pipeline and a steam conveying pipeline are arranged on the evaporation tower, and a spraying system is mounted in the evaporation tower; the spraying system comprises a defoaming agent tank, a liquid pump, a valve, a spraying pipeline, sprayers and a foam sensor, the defoaming agent tank is communicated with the spraying pipeline mounted in the evaporation tower through the liquid pump and the valve, the spraying pipeline is provided with a plurality of sprayers, and the foam sensor located above the liquid level is arranged in the evaporation tower. According to the automatic defoaming system of the evaporation tower, the liquid level is limited through the liquid level sensor, the liquid feeding and discharging amount is controlled, the liquid level is kept, when foam is generated, the foam triggers the foam sensor above the adjacent liquid level to send an electric signal to the controller, the controller controls the liquid pump to work, the valve is opened, and a defoaming agent is sprayed through the spraying system; after defoaming is completed, the spraying system is closed, and automatic defoaming is achieved.

The invention relates to the technical field of safety protection of transformer substations, and discloses a transformer substation flood control detection system which comprises a passive flood control barrier subsystem which comprises a detachable pressing type flood control baffle unit and a one-way drainage check valve and is used for physically preventing external flood from flowing backwards; the flood situation detection and active drainage subsystem comprises an accumulated water collection unit, a detection sensing unit, a drainage execution unit and an intelligent control unit, and the intelligent control unit responds to the water level obtained by the detection sensing unit and automatically controls the drainage execution unit to execute drainage; and the auxiliary safety protection subsystem is used for providing operation guarantee and personnel safety protection. Through cooperative work of the three subsystems, a three-in-one layered defense system of physical barrier, active drainage and safety guarantee is constructed, and the system has the beneficial effects of high reliability, high error-tolerant rate, intelligent fine management and the like.

Level is detected of contents of a container or drum. Systems may wirelessly report when contents of the container are nearly depleted. Components include a plug, a sensor, a structural member, a terminal connector in the plug, and internal and external cables. The plug may screw into a vent hole in the container and a signal connector on the external cable connects to the terminal connector. The connectors may be configured or have magnets to prevent reverse connection. Various embodiments have a second sensor, a wireless gateway, GPS location data, cloud data processing, or a recess to receive a tool to rotate the plug and remove the system from the container. The structural member may bend to maintain verticality.