Main Types of Magnetostrictive Position Sensors

The Magnetostrictive Position (Level) Sensor utilizes the magnetostrictive principle and generates a strain pulse signal through the intersection of two different magnetic fields to accurately measure the position.

The measuring element is a waveguide tube, and the sensitive element inside the waveguide tube is made of special magnetostrictive materials.

-Waveguide Tube: The primary sensing element, containing a specially designed magnetostrictive material.

-Moving Magnet (Position Magnet): A permanent magnet ring that slides along the waveguide tube, representing the measured position.

Below are the main types of Magnetostrictive Position Sensors, categorized by Output Signal & Mechanical Structure. 

(A)  Classification by Output Signal

Analog Output

4–20mA / 0–10V: Standard signals for industrial PLCs and control systems.

0–5V / ±10V: Commonly used in servo systems and motion control applications.

Digital Output

SSI (Synchronous Serial Interface): Provides high resolution and noise immunity, ideal for CNC machinery.

CANopen / Profibus / IO-Link: Designed for smart factories and Industry 4.0 implementations.

RS485 / Modbus: Facilitates long-distance communication in distributed control systems.

(B)  Classification by Mechanical Structure

Rod-type (Linear Configuration)

Features a waveguide rod enclosed within a stainless steel tube.

Typically used in hydraulic cylinders, press machines, and injection molding equipment.

Tape-type (Flexible Waveguide)

Incorporates a flexible waveguide for curved-path or space-constrained installations.

Frequently employed in mobile machinery and agricultural equipment.

Externally Mounted (Non-intrusive Design)

The position magnet moves along the exterior of the sensor, eliminating direct media contact.

                        Particularly suited for harsh operating environments (e.g., high-pressure systems, corrosive fluids).