Magnetostrictive Level Transmitters are level sensors for continuous level measurement. It is the best technology for monitoring and controlling liquid level interface.

Magnetostrictive Level Transmitters

Magnetostrictive Level Transmitters are used for continuous measurement of liquid level and interface. Magnetostrictive level measurement is currently the best liquid level measurement and control technology.Sino-Inst’s Magnetostrictive Level Transmitters can provide two independent outputs: interface; overall level. It can be applied when the difference in specific gravity drops to 0.02. Magnetostrictive Level Sensors Commonly used for the measurement of the oil-water interface. And others include acid tanks, propane containers, desalter and sewage tanks. Magnetostrictive Level Transmitters are composed of three parts: probe rod, circuit unit and magnetic float. The flexible cable type and the outer buoy type are derived from the basic model. And has a variety of communication modes 4~20mA, 0~5V, 0~10V, HART, RS-485 and so on.

Sino-Inst offers a variety of magnetostrictive level transmitters for industrial level measurement. If you have any questions, please contact our sales engineers.

Featured Magnetostrictive Level Transmitters

Features of Magnetostrictive Level Transmitters

Magnetostrictive Level Transmitters are divided into three types: flexible probe type, hard probe type, and outer float isolation detection. The watch body contains two main parts: the electronic part and the sensing part. The advantages of Magnetostrictive Level Transmitters are:

  1. Strong reliability:
    Because the magnetostrictive liquid level gauge adopts the principle of waveguide, there is no mechanical movable part. Therefore, there is no friction and no wear. The entire converter is enclosed in a stainless steel tube and is not in contact with the measurement medium. The sensor works reliably and has a long life.
  2. High precision:
    Because the magnetostrictive liquid level gauge works with waveguide pulses. In the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse. Therefore, the measurement accuracy is high and the resolution is better than 0.01%FS. The accuracy achieved.
  3. Good security:
    Magnetostrictive liquid level gauge has high explosion-proof performance. Intrinsically safe explosion-proof and safe to use. Especially suitable for the measurement of chemical raw materials and flammable liquids There is no need to open the tank lid during the measurement. Avoid the unsafeness of manual measurement.
  4. Easy to install and maintain:
    The magnetostrictive liquid level gauge 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. It can not affect normal production during the installation process.
  5. Facilitate system automation:
    The secondary instrument of the magnetostrictive liquid level gauge adopts the standard output signal. It is convenient for the computer to process the signal. It is easy to realize the network work and improve the automation degree of the entire measurement system.

Sensing part (ie probe rod):

The probe has a diameter of 5/8” and the end is sealed. The inside of the probe is hollow and equipped with precision magnetostrictive wires. In addition to the magnetostrictive wires, the probe can also hold up to 8 RTD The sensor is used to detect the temperature. The maximum length of the probe can be 23 meters, and the flexible cable structure is used above 6 meters.

Electronic part (ie controller):

The shell is made of aluminum alloy or 304 stainless steel. It is a double-chamber type (that is, the transmission part is separated from the wiring part). One of the chambers is a micro-processing module and a circuit board, and the micro-processing module has operation buttons. The other chamber is a binding post. There is a wire connected between the circuit board and the probe processing board. This wire should not be loosened without authorization from the manufacturer.

Magnetostrictive Level Transmitters | Best Manufacturer price

magnetostrictive level transmitter working principle

The magnetostrictive liquid level/boundary transmitter is designed using a physical phenomenon – the principle of magnetostriction. The specific working principle is as follows:

A fine magnetostrictive wire is installed in a non-magnetic sensing tube. A piezoelectric sensor is connected to one end of the magnetostrictive wire. The piezoelectric sensor sends 10 current pulse signals to the magnetostrictive wire every second. and time it.

The current pulse travels down the magnetostrictive wire. A circular magnetic field is generated that moves downward.

magnetostrictive level transmitter working principle
Magnetostrictive Level Sensor Operating Principle

The annular magnetic field interacts with the magnetic field of the magnetic float. A torsional stress wave is generated on the magnetostrictive line. This torsional stress wave travels from the float position up and down the magnetostrictive line at a known speed. Knowing The piezoelectric magnetic 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 according to the time interval. Since the float always floats on the liquid surface, the liquid level can be accurately determined s position.

Applicaitons of Magnetostrictive Level Transmitters

Industries served:Applications:
Oil and GasPosition Sensing
PetrochemicalSanitary Service
ChemicalValve Positioning
Power GenerationInventory Control
Water and wastewater treatmentCorrosive Process
Pulp and PaperUnderground Tanks
BiotechPrimary Level/Interface
Marine  Process Temperature and Level

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

magnetostrictive level transmitter advantages and disadvantages

When the sensor of the magnetostrictive liquid level transmitter works, the circuit part of the sensor will excite a pulse current on the waveguide wire. When the current propagates along the waveguide wire, a pulsed current magnetic field is generated around the waveguide wire.

Magnetostrictive level transmitter advantages:

  1. The magnetostrictive liquid level gauge is suitable for liquid level measurement of clean liquid level with high precision requirements. The precision reaches 1mm, and the product precision can reach 0.1mm.
  2. It can be used to measure the interface between two different liquids.
  3. The biggest advantage of magnetostriction lies in its extremely high resolution, which can be at the micron level. A typical application is to measure the position of a rolling mill load hydraulic cylinder. But the design here is not the same as level measurement. The position measurement of the hydraulic cylinder is not that the hydraulic oil drives the magnetic ring (ie, the floating ball). Instead, the movable part of the cylinder body drives the magnetic ring to move through the mechanical structure, so the position is very clear. Usually, the precision requirements of the rolling mill for the thickness of the sheet are usually several to tens of microns. Therefore, the resolution of the magnetostrictive sensor must reach the micron level.
  4. The explosion-proof intelligent electronic circuit design can calculate the volume
  5. The movable part of the magnetostrictive liquid level gauge is a float, and the maintenance is extremely low. It is used in liquid level measurement of various storage tanks and has the characteristics of strong environmental adaptability and convenient installation.

Compared with liquid level gauges such as radar, it has a very high cost performance and many functions in short-range measurement. The display screen has current, temperature and interface display. This is exactly why the magnetostrictive level gauge can become one of the most common products used on metering tanks such as gas stations today.

Disadvantages of magnetostrictive level transmitter:

  1. The anti-interference ability is slightly poor (generally it is not recommended to be used in places with strong electromagnetic radiation such as power plants).
  2. It must be a contact measurement, but the real measurement unit is not in contact with the liquid, and only its protection tube is in contact with the liquid.
  3. The medium is in direct contact, and the floating ball sealing requirements are strict, and the viscous medium cannot be measured.
  4. Installation is limited. Higher installation and maintenance requirements, so the market is not widely used.

Extended reading: How To Select Hydraulic Flow Meter?

Magnetostrictive level transmitter price

The price of a magnetostrictive level transmitter is determined based on the measurement conditions. Sino-Instrument is a manufacturer of magnetostrictive level gauges. We offer magnetostrictive level gauges at the right price.

Selection considerations: 

1. The selection of the level gauge should be consistent with the environment of the media on the site. Including ambient temperature, pressure, vibration, shock, compatibility of structural materials and media, etc.   

2. When the temperature of the measured medium is high (100 ~ 200), it is recommended to choose a probe with an outer float type and use a side flange installation. When the temperature is higher (200 ~ 300), it is recommended to choose a probe with a side-bundled type with an outer float, and install it with a side flange.   

3. There are measurement dead zones at the upper and lower ends of the measuring rod of the magnetostrictive level gauge, which should be considered when selecting the range.   

4. The size of the stainless steel magnetic float commonly used for level gauges is Ф45 × 56 × Ф15, and flange connection of DN50 or above is required. For the liquid level gauge with thread connection, users need to install flange or bracket.

More Level Senors for Tank Level Measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy. These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Guided Wave Radar (GWR) Level Transmitters, also called wave guided radar level transmitter. Using guided wave radar technology, GWR level transmittershave no moving parts. They can measure both level and the interface between two media. Continuous level measurement in liquids and solids with guided wave radar sensors. These transmitters work by sending a microwave pulse through a sensor cable or rod. The signal hits the surface of the liquid, and travels back to the sensor, and then to the transmitter housing. Based on the time taken by the signal to travel down the sensor and back up again. The electronics integrated in the transmitter housing determine the filling level.

Hydrostatic level transmitters, also called submersible level transmitter, or pressure level transmitters. For Hydrostatic level measurement, Continuous level measurement in liquid applications with pressure sensors. These transmitters help in determining fluid level of a container. By measuring the pressure of resting body of the fluid within it.

Read more about: Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

Ultrasonic Level Indicator, also called Ultrasonic level sensor, or ultrasonic level transmitter. In this type of transmitter, an ultrasonic transducer is mounted at, or near the top of a container containing liquid. The transducer sends out an ultrasonic pulse. The pulse hits the surface of the liquid, and gets reflected. The sensor then calculates the fill level based on the time between the transmitted and received signal.


Magnetostrictive liquid level transmitter is a kind of liquid level sensor. But it uses the principle of magnetostrictive operation internally. And combines modern electronic technology to measure the time value between pulse waves to achieve the purpose of accurately measuring the liquid level . The magnetostrictive liquid level meter works with waveguide pulses. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high.

1.The device electronics generates a low energy current pulse at fixed intervals.
2.The electrical pulses create a magnetic field which travels down a specialized wire inside the sensor tube.
3.The interaction of the magnetic field around the wire and the magnetic float causes a torsional stress wave to be induced in the wire. This torsion propagates along the wire at a known velocity, from the position of the magnetic float and toward both ends of the wire.
4.A patented sensing element placed in the transmitter assembly converts the received mechanical torsion into an electrical return pulse.
5.The microprocessor-based electronics measures the elapsed time between the start and return pulses (Time of Flight). And converts it into a position measure-ment which is proportional to the level of the float.

The level of the liquid medium in the container is called the liquid level. And the instrument that measures the liquid level is called the liquid level transmitter. Level transmitter is a kind of level instrument. There are two types of level transmitterss, one is continuous and the other is point-off. The continuous level transmitter is a real-time monitor of the height of the liquid in the container. The point type, which generally takes two points, high and low, and outputs an alarm signal when the medium in the container reaches these two points.The types of liquid level transmitters is very wide. Specific include: magnetic flap liquid level gauge, tuning fork vibration type, differential pressure type, pressure type. Ultrasonic, magnetostrictive liquid level gauge, magnetic flap, radar and so on.
Levels of media such as: water, viscous fluids, and fuels, or dry media such as bulk solids and powders can be measured using the transmitter.
Level measurement transmitter are used in a myriad of applications that require level measurement within containers or tanks. These transmitters often find their application in material handling, food and beverage, power, chemical, and water treatment industries.
Learn More

Radar level transmitter is a kind of liquid level transmitter which uses the principle of radar operation.
Radar Level Sensor also called radar level transmitter, are the indicating transmitter for liquid level.
Non-contact Continuous level measurement in liquids and solids with free space radar sensors.
RADAR (Radio Detection And Ranging) is a device which can detect the presence of faraway objects by obtaining a reflection of electromagnetic waves emitted from the device itself. Although invented much earlier, wide deployment of radar was done by Britain during the Second World War to detect oncoming German bombers.
Radar level measurement is a safe solution. Even under extreme process conditions (pressure, temperature) and vapors. Various antenna versions for every kind of radar applications are available.
In continuous non-contact level measurement with radar, the sensor sends microwave signals towards the medium from above. The surface of the medium reflects the signals back in the direction of the sensor. Using the received microwave signals, the sensor determines the distance to the product surface and calculates the level from it.

Magnetostrictive probe technology provides underground storage tank and above ground storage tank owners a highly accurate device to measure and transmit water height, fluid height and temperature to a monitoring device. In addition, Veeder-Root probes support in-tank leak detection to assist in compliance management.

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Sino-Instrument offers over 10 Magnetostrictive level transmitters for level measurement. About 50% of these are Magnetostrictive liquid level meters, 40% is the tank level sensor.

A wide variety of Magnetostrictive level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Magnetostrictive level measurement instrumentation, located in China.

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