Magnetostrictive Level Transmitter | High Accuracy 0.2m~23m

Magnetostrictive Level Transmitters

The magnetostrictive level transmitter is a new type of liquid level measuring instrument used for continuous measurement of liquid level and interface. Measuring range: 0.2m~23m; accuracy optional: ±1mm, ±5mm, ±1cm, ±2cm, ±5mm.

Our Sino-Inst magnetostrictive level transmitter can provide two independent outputs: one, interface; two, overall level. It can be applied when the specific gravity difference is reduced to 0.02. Commonly used for measuring oil-water interfaces, and others including acid tanks, propane containers, desalters and sewage tanks.


  • It has advanced principles and multiple functions, and is suitable for level measurement of clean liquids such as water, oil, ethanol, etc.;
  • High precision, high stability, high reliability, high resolution;
  • Non-contact measurement, long life;
  • Low power consumption, high performance-price ratio;
  • Isolated explosion-proof or intrinsically safe;
  • 4~20mA two-wire system, 0~5V, HART, RS-485 optional;
  • Exquisite structure, strong environmental adaptability, anti-fouling, dust-proof and waterproof. (IP65);
  • Simple installation and debugging, convenient maintenance;
  • No need for regular re-labeling and maintenance;
  • The power supply voltage has a wide adaptable range and strong anti-interference ability;
  • Real-time measurement of liquid level and interface level;
  • With reverse polarity protection function;
  • Anti-lightning strike, anti-radio frequency interference;

Structure of Magnetostrictive Level Transmitter

Magnetostrictive Level Transmitters are divided into three series: flexible probe rod type, hard probe rod type, and external float isolation detection series. The meter body contains two main parts: the electronic part and the sensing part.

Magnetostrictive Level Transmitters Dimensions
Magnetostrictive Level Transmitters Dimensions

Sensing part (probe):

The probe rod is 5/8” in diameter and has a sealed end. The interior of the probe rod is hollow and contains precision magnetostrictive wire.

In addition to the magnetostrictive wire, the probe rod can also be equipped with up to 8 RTD temperature sensors for temperature detection.

The maximum length of the probe rod can be 23 meters, and all probes above 6 meters adopt a flexible cable structure.

Electronic part (i.e. transmitter):

The shell is made of aluminum alloy or 304 stainless steel, and is double-chamber type (that is, the transmission part and the wiring part are separated). One cavity contains the microprocessing module and circuit board. The microprocessing module has operating buttons, and the other cavity contains the binding posts.

There is a wire connecting the circuit board to the probe processing board.

Technical Parameters

Applicable mediaSuitable for level measurement of clean liquids such as water, oil, ethanol, etc.
Power supply24V±2.4VDC/220V
Operating temperature-40℃-320℃
Humidity limitsSAMA
Pressure limit2000psi
Maximum range0.3m~18.1m
Temperature output0-8 temperature point output (optional)
Output form4~20mA, 0~5V, HART, RS-485
linear errorBetter than ±0.02%FS;
Output temperature drift50ppm/℃
Product power consumption≤50mA
Output ripple≤20MV
Display typeLCD display/without display
load capacity4~20mA output: load capacity ≤500Ω;

0~5V output; controller load ≥5KΩ
Rod material0Cr18Ni9Ti, 1Cr18Ni9Ti, PTFE lined
Electronic compartment shell1Cr18Ni9Ti or aluminum explosion-proof shell.
Lead methoda. Shielded cable connection, b. Aviation plug connection

c.Terminal connection
Explosion-proof certificationExdIIBT5, ExiaIIBT5, ExdIICT5
Protection level:IP65
 Polarity protectionDiodes are connected in series in the loop
   DiagnosisOnline diagnosis via HART protocol or AMS protocol,
Magnetostrictive Level Transmitter cable type
Magnetostrictive Level Transmitter cable type

Magnetostrictive Level Transmitter working principle

The magnetostrictive liquid level/interface level transmitter is designed using the principle of magnetostriction, a physical phenomenon.

The specific working principle is as follows:

A fine magnetostrictive wire is installed in a non-magnetic sensing tube. One end of the magnetostrictive wire is connected to a piezomagnetic sensor. The piezomagnetic sensor sends 10 current pulse signals to the magnetostrictive wire every second. And timing. The current pulse is transmitted downward along the magnetostrictive line, generating a downward-moving ring magnetic field.

The annular magnetic field interacts with the magnetic field of the magnetic float, generating a torsional stress wave on the magnetostrictive line. This torsional stress wave travels from the position of the float to the upper and lower ends along the magnetostrictive line at a known speed. It is known that Until the piezomagnetic sensor receives this torsional stress wave signal.

The time interval between the initial current pulse wave and the return torsional stress wave can be known through the timing circuit. The position of the float can be determined based on the time interval. Since the float always floats on the liquid surface, the liquid level can be accurately determined s position.

Magnetostrictive Level Transmitter working principle
Magnetostrictive Level Transmitter working principle

Magnetostrictive Level Transmitter Advantages and Disadvantages

  • Strong reliability: Since the magnetostrictive level gauge adopts the waveguide principle and has no mechanical movable parts, it has no friction and no wear. The entire converter is enclosed in a stainless steel tube and has no contact with the measurement medium. The sensor works reliably and has a long life.
  • High accuracy: Since the magnetostrictive liquid level meter works with waveguide pulses, the measured displacement is determined by measuring the time of the start pulse and the end pulse during operation. Therefore, the measurement accuracy is high. The resolution is better than 0.01% FS. This is an accuracy that is difficult to achieve with other sensors.
  • Good safety: The magnetostrictive liquid level meter has high explosion-proof performance. It is intrinsically safe and explosion-proof and safe to use. It is especially suitable for measuring chemical raw materials and flammable liquids. There is no need to open the tank lid when measuring, avoiding the unsafety of manual measurement.
  • The Magnetostrictive Level Transmitter is easy to install and maintain: The magnetostrictive liquid level meter is generally installed through the existing pipe opening on the top of the tank. It is especially suitable for the installation of underground storage tanks and storage tanks that have been put into operation, and can be installed during installation. Normal production will not be affected during the process.
  • Facilitate system automation: the Magnetostrictive Level Transmitter can optionally output signals of 4~20mA, 0~5V, HART, and RS-485. It is convenient for the microcomputer to process the signal, and it is easy to implement networking work. Improve the automation of the entire measurement system.

Compared with liquid level gauges such as radar, it is extremely cost-effective and has many functions in short-range measurements. The display screen has current, temperature, and interface displays. This is why magnetostrictive level transmitters have become one of the most common products used today in metering tanks such as gas stations.

  1. The anti-interference ability is slightly poor (generally not recommended for use in places with strong electromagnetic radiation such as power plants).
  2. It must be a contact measurement, but the real measuring unit is not in contact with the liquid, only its protective tube is in contact with the liquid.
  3. The medium is in direct contact, and the floating ball sealing requirements must be strict, and viscous media cannot be measured.
  4. Installation is limited. High installation and maintenance requirements have led to low market popularity.

Featured Applications

Magnetostrictive level transmitter is suitable for continuous measurement of liquid level and interface.

Magnetostrictive Level Transmitter Applications

High-tech magnetostrictive liquid level sensor is used for liquid level measurement in various storage tanks. This type of liquid level meter has the characteristics of high precision, strong environmental adaptability, and easy installation.

Therefore, it is widely used in liquid level measurement fields such as petroleum and chemical industry, and gradually replaces other traditional sensors and becomes a high-quality product in liquid level measurement.

In the refined oil distribution industry of PetroChina and Sinopec, the oil volume in oil tanks is mostly measured by manually climbing the tank and measuring with a ruler. Use a metric steel tape measure with a weight or a ruler with graduations to measure, manually record the readings, manually look up the table and convert, and finally get the oil volume data. This measurement method is not only labor-intensive, but also has unsafe factors and cannot guarantee accuracy.

Magnetostrictive liquid level gauges solve the above problems very well and can provide measurement accuracy up to millimeter level, and are widely used in various fields.

In chemical production, it is particularly important to accurately measure the liquid level of media in reactors and storage tanks, as well as the interfaces of multiple media in the same container, especially in important combination reactors and large-volume storage tanks.

The density of the float of the magnetostrictive level gauge is determined based on the actual density of the upper and lower media of the storage tank. The density is between the densities of the upper and lower media, that is, the density of the float ρ2<ρ3<ρ1.

According to the principle that the buoyancy force on the float is equal to the gravity of the float, the float will float at the interface position to be measured.

When the two liquid density values are determined, an accurate calculation of the float is performed. When the difference between ρ1 and ρ2 is larger, the measurement is easier and the accuracy is higher.

The float accurately floats on the interface to ensure high-precision measurement of the magnetostrictive level gauge. At the same time, a float is installed on the magnetostrictive liquid level meter to measure the height of the water seal, perform direct interface measurement, and indirectly calculate the interface value. In addition, it can also measure the interface and liquid level dual level output at the same time.

Oil-water interface, methane chloride, and styrene can also be measured.

More Industrial Level Transmitters and Measurement Solutions

In industrial production, the control and detection of liquid level is very important, especially in storage tanks. Magnetostrictive Level Transmitter, as a liquid level gauge widely used in storage tanks, has the advantages of high accuracy, strong reliability, and long service life. It has become one of the standard equipment for liquid level detection in storage tanks.

Our Sino-Inst’s Magnetostrictive Level Transmitter supports customization of various measurement parameters, temperature, pressure, range, output, etc. In addition to Magnetostrictive Level Transmitter, we also provide ultrasonic, radar, hydrostatic pressure and other liquid level meters. If you need to purchase Magnetostrictive Level Transmitter, or need to measure liquid level, interface, etc., please feel free to contact us!

    Request For Quote

    Magnetostrictive Level Transmitter for Sale| 0.2m~23m

    Magnetostrictive Level Transmitter for liquid level and interface measurement. Optional temperature output. Range: 0.2m~23m; accuracy: ±1mm, ±5mm. Best price!

    Product SKU: Magnetostrictive Level Transmitter | High Accuracy 0.2m~23m

    Product Brand: Sino-Inst

    Product Currency: USD

    Product Price: 690

    Price Valid Until: 2029-09-09

    Product In-Stock: InStock

    Editor's Rating: