Magnetic flap level gauge

Intuitive and accurate, with no deviation in readingsUsing a red and white/black and white dual color magnetic flip board as the display unit, the flip board flips synchronously with the magnetic float when the liquid level rises, forming a clear liquid level interface. The staff can quickly read the liquid level value from a few meters away without visual error. Compared to the glass tube level gauge, which requires close observation and is easily affected by the transparency of the medium,Magnetic flap level gaugeThe advantage is more significant in dim and noisy industrial sites, with conventional measurement accuracy up to ± 10mm and some high-precision models up to ± 5mm.

Corrosion and pressure resistance, strong adaptability to working conditionsThe main structure is made of stainless steel (304/316L), carbon steel or polytetrafluoroethylene material, which can adapt to different medium characteristics - stainless steel material is resistant to general corrosion and suitable for media such as oil and water; Polytetrafluoroethylene material is resistant to strong corrosion and can measure acidic and alkaline solutions such as hydrochloric acid and sulfuric acid; Carbon steel material is suitable for atmospheric pressure, non corrosive storage tanks (such as crude oil storage tanks). At the same time, the equipment has a high pressure resistance level (conventional ≤ 6.3MPa, high-pressure models can reach 32MPa) and a wide temperature resistance range (-40~450 ℃), which can meet the complex working conditions such as chemical high-pressure reactors and power plant high-temperature water tanks.

Durable structure and low maintenance costNo mechanical transmission components, only magnetic coupling is used to achieve the linkage between the float and the flap, avoiding component wear and jamming problems, with a service life of up to 8-10 years. Daily maintenance only requires regular cleaning of the dust on the surface of the flipper, without dismantling the equipment. The maintenance workload is much lower than that of differential pressure level gauges (which require regular calibration of transmitters), and there is no risk of electronic component failure. It is suitable for use in remote tank areas without human supervision.

Scalable functionality, adapted to automation needsSupport the installation of magnetic switches (such as reed switches) to achieve liquid level alarm function. When the liquid level reaches the preset upper and lower limits, the switch output signal controls the start and stop of the pump valve or triggers an audible and visual alarm; It can also be equipped with a liquid level transmitter to convert liquid level signals into 4-20mA analog signals or RS485 digital signals, which can be connected to PLC and DCS systems to achieve remote monitoring and meet the needs of on-site observation and automation management.

Float rises and falls with the liquid levelThe main body of the device is a measuring tube (also known as the "main tube") connected to the container, and a freely movable magnetic float (with a magnet inside the float) is placed inside the tube. When the liquid level in the container changes, the liquid level in the measuring tube changes synchronously, and the float rises or falls with the liquid level under buoyancy, always floating on the liquid surface.

Magnetic coupling drives flipping of the flipping plateThe outer side of the measuring tube is equipped with a magnetic flip plate component along the height direction (composed of multiple independently rotatable magnetic flip plates), each flip plate is equipped with a small magnetic steel, and the initial state is a uniform color (such as white). When the float rises to a certain flipping position, the magnet inside the float attracts the small magnetic steel inside the flipping plate through magnetic coupling, causing the flipping plate to flip 180 degrees and change color to another color (such as red); When the float descends, the flap returns to its initial color under its own gravity or reverse magnetic force, forming a clear liquid level interface with alternating red and white.

Liquid level reading and expansionBy observing the boundary line of the color change of the flipper, the current liquid level value can be directly read (there is a scale next to the flipper component, usually in mm or m); If a magnetic switch is installed, when the float reaches the switch position, the magnetic force of the float triggers the switch action and outputs an alarm or control signal; If paired with a transmitter, the transmitter detects the position of the float (such as Hall effect, magnetoresistance effect), converts the liquid level height into an electrical signal, and achieves remote data transmission.

Measurement tube (supervisor)Connected to the container through flanges or threads to form a connector, ensuring that the liquid level inside the container is consistent with that inside the container. The material is selected based on the corrosiveness of the medium, such as 316L stainless steel for corrosion-resistant scenarios, polytetrafluoroethylene for strongly corrosive scenarios, and carbon steel for non corrosive, high-pressure scenarios.

Magnetic floatTo determine the buoyancy and magnetic strength of the float, the material and structure of the float should be selected based on the density of the medium - stainless steel hollow floats are commonly used for measuring liquids (with low density and high buoyancy), and solid metal floats are commonly used for measuring viscous media (such as crude oil) (to prevent the adhesion of viscous media from affecting lifting). High coercivity materials (such as neodymium iron boron) should be selected for the magnets inside the float to ensure stable magnetic coupling.

Magnetic flap assemblyCore display components, usually made of engineering plastic or stainless steel, with high contrast color combinations (such as red, white, black, and white) to ensure clear visibility from a distance. Some models use sealed flip boxes to prevent dust and rainwater from entering and affecting the flip, with a protection level of up to IP65 or IP67.

AttachmentIncluding magnetic switches (for alarm control), liquid level transmitters (for remote monitoring), drain valves (for cleaning measuring pipes), mounting brackets (for fixed equipment), etc., can be selected according to actual needs.

According to installation method：

According to the characteristics of the medium：

Media adaptationSelect the material of the measuring tube and float based on the corrosiveness of the medium (such as polytetrafluoroethylene for strong corrosion and 316L stainless steel for general corrosion), choose the float structure based on the density of the medium (such as hollow float for low-density medium and solid float for high-density medium), and choose the float surface treatment based on the viscosity of the medium (such as polished float for viscous medium to prevent adhesion).

operating conditions parametersConfirm the maximum temperature and pressure of the medium, and select the model with the corresponding temperature and pressure resistance level (such as 310S material for high temperature and thick walled measuring tube for high pressure); The measurement range is determined based on the height of the container, and the length of the measuring tube is usually 50-100mm longer than the effective liquid level height of the container to ensure full coverage.

Installation requirementsSelect side or top mounted according to the opening position of the container. For side mounted, the height and diameter of the opening on the side wall of the container need to be confirmed, while for top mounted, the diameter and installation space of the opening on the top of the container need to be confirmed; If there is dust or rainwater on site, a sealed flip box (IP65 or above protection level) should be selected.

Functional requirementsOnly on-site observation is required to select the basic type; Magnetic switch (single point or multi-point) should be installed for liquid level alarm; Remote monitoring is required to select a matching liquid level transmitter (confirm the output signal type, such as 4-20mA, RS485).

Regular cleaning and inspectionClean the dust and oil stains on the surface of the flipper every 3-6 months to ensure clear and visible colors; Check if there is any leakage in the measuring tube (especially at the flange connection), and if any leakage is found, tighten or replace the sealing gasket in a timely manner; Check if the float is stuck (by manually shaking the measuring tube to observe if the float moves flexibly). If it is stuck, disassemble and clean the measuring tube and float.

Maintenance of magnetic componentsRegularly check the magnetic properties of the float (if the magnetic properties weaken, the float needs to be replaced) to avoid magnetic coupling failure that may cause the flipping plate to not flip over; Check the triggering sensitivity of the magnetic switch. If the triggering is not accurate, adjust the switch position or replace the switch.

environmental protectionOutdoor installed equipment needs to be equipped with rain covers to prevent rainwater from entering the flipping components and affecting flipping; In scenes with high levels of dust (such as cement plants), it is necessary to regularly blow and sweep the dust on the surface of the flipper to prevent it from getting stuck by the dust.