Linear Variable Differential Transformer Sensor

Linear Variable Differential Transformer (LVDT) sensors are widely used in the industrial sector for accurate and reliable measurement of linear displacement and position. They operate on a non-contact principle, which eliminates mechanical wear and ensures long service life, high repeatability, and excellent stability even in harsh operating conditions.

LVDTs are well-suited for industrial environments involving vibration, temperature variations, dust, moisture, and exposure to oils or chemicals. They provide continuous and absolute position feedback, making them ideal for automation, control, and monitoring systems where precision and reliability are critical. The LVDT sensors are used in the following industrial applications:

• Gas Turbine
• Power Turbine
• Steam Turbine

• For the datasheet, please click here.

How LVDT work?

LVDT is an electromechanical transducer that converts a core’s linear displacement (mechanical movement) into an electrical signal without mechanical contact, using transformer principles.
Unlike resistive sensors, an LVDT operates friction-free, eliminating wear, minimizing hysteresis, and ensuring absolute position referencing even after power loss. The working concept is based on mutual inductance variation:

• A central primary coil is energized by AC.
• Two secondary coils are placed symmetrically on either side of the primary, wound in series opposition (opposite polarity)..
• A movable soft iron (ferromagnetic) core, attached to the object being measured, slides inside the coils without contact, altering the magnetic coupling between the primary and each secondary

Displacement changes the induced voltages in the secondaries, and the differential output directly corresponds to position, while phase polarity indicates direction

Common Industrial Applications of LVDT Sensors Include:

• Position and stroke measurement in hydraulic and pneumatic cylinders
• Valve position monitoring in process control systems
• Thickness and dimension measurement in metal forming and rolling mills
• Machine tool positioning and CNC equipment feedback
• Press, molding, and stamping machine displacement monitoring
• Structural movement and alignment monitoring in heavy machinery
• Quality control and in-process inspection systems
• Due to their durability, precision, and adaptability, LVDT sensors play a vital role in modern industrial automation, helping manufacturers improve process accuracy, operational efficiency, and overall system safety.