Magnetostrictive Displacement Sensor 50 to 20000mm

The JW-MDS(S09) Magnetostrictive Displacement Sensor is a high-precision, non-contact linear position transducer designed for absolute displacement measurement and industrial liquid level monitoring.

Based on magnetostrictive sensing technology, it measures the position of a moving magnet without mechanical contact between the magnet and the sensing element.

With selectable measuring ranges from 50mm to 20000mm, fast response, high repeatability, and multiple analog and digital output options, the sensor is suitable for hydraulic cylinders, industrial machinery, automation equipment, metallurgy, and storage tank applications.

Its absolute position measurement principle allows the sensor to recover position information after power restoration without performing an incremental homing sequence.

1. How Does a Magnetostrictive Displacement Sensor Work?

A magnetostrictive position sensor measures the location of a magnetic position marker along a sensing probe.

The sensor contains a magnetostrictive waveguide. A magnetic field generated by a position magnet interacts with an electrical excitation pulse, producing a torsional strain wave inside the waveguide.

The sensor electronics detect the returning wave and measure its travel time.

Because this travel time is related to the magnet’s position, the electronics can calculate its location along the measuring axis.

Position Magnet → Magnetostrictive Wave → Time-of-Flight Measurement → Absolute Position Output

Advantages of Non-Contact Measurement

Unlike a conventional potentiometric displacement sensor, the position magnet does not require sliding electrical contact with the sensing element.

This can reduce wear at the measurement interface and is particularly useful in applications involving frequent mechanical movement.

The sensor still requires correct installation, protection of electrical connections, and appropriate maintenance for its operating environment.

2. Technical Specifications

Electrical Specifications

Measurement Performance

Mechanical Specifications

Technical note: Performance, pressure ratings, protection grades, and explosion-protection configurations must be confirmed against the selected product specification and applicable certification documents. The stated resolution and linearity are not guarantees of total system accuracy.

3. Absolute Position Measurement

One important advantage of magnetostrictive technology is its ability to provide absolute position feedback.

An incremental encoder tracks movement by counting pulses. After certain power interruptions, a system may need to establish a reference position again.

The JW-MDS(S09) measures the position magnet directly along its calibrated sensing range.

This makes the sensor suitable for machinery where reliable position recovery is important.

Typical applications include hydraulic cylinders, automatic production machinery, lifting systems, and industrial process equipment.

4. Output Signals and Industrial Integration

The sensor supports multiple signal interfaces for industrial controllers and measurement systems.

4.1 Analog Outputs

Available options include:

• 4–20mA
• 0–20mA
• 0–5V
• 0–10V
• ±10V

Analog configurations can connect to compatible PLC analog input modules or industrial data acquisition equipment.

4.2 Digital Outputs

Available options include:

• Modbus RS485
• SSI
• START/STOP

Digital interfaces support position data acquisition using compatible communication equipment.

For Modbus RS485, the register map, communication settings, and supported functions should be confirmed before integration.

4.3 PLC and Monitoring System Integration

A typical system architecture is:

Position Magnet → Magnetostrictive Sensor → PLC / RTU → HMI or Industrial Monitoring System

The PLC can use the measured position for machine feedback, process monitoring, and configured control functions.

Remote data transmission requires suitable external communication equipment.

Explore Industrial IoT Monitoring Solutions for related system integration applications.

5. Industrial Applications

5.1 Hydraulic Cylinder Position Measurement

Hydraulic cylinder position feedback is a key application of magnetostrictive linear position sensors.

A compatible probe can be installed as part of a properly designed hydraulic cylinder assembly, while a position magnet follows the movement of the piston.

The sensor provides absolute stroke-position data without requiring mechanical contact between the magnet and waveguide.

System design must account for available installation space, pressure requirements, sealing, and mechanical compatibility.

5.2 Industrial Automation

Automated machinery requires continuous position information for moving components.

Magnetostrictive position sensors can provide feedback for compatible motion platforms, heavy machinery, and automated production equipment.

High repeatability and fast response support applications requiring frequent position updates.

5.3 Metallurgical Equipment

Steel production and metal-processing machinery operate under demanding mechanical and environmental conditions.

The JW-MDS(S09) can be considered for suitable linear position measurement points in metallurgical equipment.

Probe material, mounting arrangement, and electronics temperature limits must be checked against actual operating conditions.

5.4 Storage Tank Liquid Level Measurement

Magnetostrictive technology can also be used for liquid level measurement using a suitable floating magnet arrangement.

As the float moves with the liquid surface, the sensor measures the magnet’s position along the probe.

For liquid level applications, confirm float compatibility, liquid density, probe length, process connection, and vessel conditions.

5.5 Chemical and Process Industries

Industrial processing equipment may require accurate position or level measurement in environments involving moisture, dust, or corrosive media.

Different probe materials and protection configurations allow selection according to the application’s environmental requirements.

Chemical compatibility and hazardous-area certification must be verified before installation.

5.6 Structural Position Measurement

For suitable installations, the sensor may provide linear position data for structural or mechanical movement monitoring.

Such applications require a suitable mechanical coupling arrangement and engineering assessment of the measuring reference.

For broader projects, position measurements can be integrated into a structural health monitoring solution.

6. Magnetostrictive vs Potentiometric vs Draw Wire Sensors

Different displacement sensor technologies suit different measurement conditions.

For conventional rod-type position feedback, explore the Linear Displacement Sensor 75–1250mm.

For cable-extension measurement, see the Draw Wire Displacement Sensor 0–1000mm.

7. Installation and Selection Guidelines

Before selecting the sensor, consider the following:

1. Measuring range: Choose a range covering the complete expected magnet travel.
2. Magnet arrangement: Verify position magnet type and mechanical movement.
3. Probe dimensions: Confirm available installation length and mounting clearances.
4. Output signal: Match the sensor interface to the receiving controller.
5. Power supply: Confirm 24V DC ±10% compatibility.
6. Process pressure: Check tube pressure limits for pressurized installations.
7. Environmental conditions: Select appropriate materials and protection grade.
8. Electrical installation: Follow the wiring and grounding requirements for the selected output version.

For hydraulic cylinders, the probe must be protected against mechanical damage, incorrect magnet alignment, and unsuitable mounting loads.

For long-stroke applications, verify full probe dimensions and installation constraints before ordering.

8. Request Technical Specifications and Quotation

Looking for a magnetostrictive linear position sensor for hydraulic cylinders, industrial automation, or liquid level measurement?

JW-IoT can assist with sensor selection and configuration.

Please provide:

• Required measuring range
• Application and installation method
• Output interface
• Probe material and process connection
• Operating temperature and pressure
• Position magnet requirements
• Purchase quantity

Contact JW-IoT for technical specifications and quotation support.