Accurately Measure Linear Displacement

TE Connectivity's Linear Variable Differential (LVDT) and Linear Variable Inductive Transducers (LVIT) absolute position transducers make accurate measurements with excellent resolution and repeatability. Offered with various packaging options, LVDTs and LVITs offer an extremely long life expectancy in harsh environments and critical applications. These sensors feature friction-free, non-contact inductive magnetic coupling for extremely long cycle life and virtually infinite resolution. Various off the shelf and custom packaging options are available for the most demanding application requirements.

Product Features:

LVDT and LVIT Sensors
  • AC-operated Linear Variable Differential Transformers (LVDTs) contain no electronics making them an excellent choice for applications with size restrictions or harsh operating environments
  • DC LVDTs have signal conditioning electronics built into the LVDT and require no calibration or special signal conditioning. Units can be powered with unipolar or bipolar DC voltages and have scaled voltage, current or digital outputs
  • LVDTs with a spring-loaded plunger and bearing assembly (gauge heads) allow for easy installation; AC, DC, and digital output versions are available in ranges from +/-0.020” to +/-2.000”
  • Separate core LVDTs are available in configurations including miniature (AC), general purpose (AC, DC and loop powered), sealed (DC, loop powered), hermetically sealed (AC, DC), submersible (loop powered), hazardous locations (AC) and custom separate core LVDT's

LVDT Sensor Features:

Position Sensor
  • Absolute output
  • Null point repeatability over wide temperature range
  • Wide temperature range (-220°C to 500°C)
  • Can be radiation hardened
  • Virtually no hysteresis
  • Frictionless operation
  • Overtravel damage resistant
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Sensor Technology Overview
  • A basic AC LVDT consists of a primary coil and two secondary coils
  • The ferromagnetic core inside the coil assembly provides a path for the magnetic flux linking the coils
  • When the primary coil is energized with an AC voltage (typically 3-7 Vrms at 2.5 kHz), the voltage is inductively coupled by the core to the two secondaries
  • The coil assembly is held stationary while the core is attached by a connecting rod to the moving object
  • Using electronics, the exact position of the core inside the coil assembly can be determined


Sensor Technology Overview
  • An internal oscillator excites the coils with the necessary AC signal
  • The DC LVDT has a small signal conditioning circuit packaged inside the sensor body
  • The synchronous demodulator circuit reads the output from the secondary coils, then rectifies and amplifies it to a scaled DC signal proportional to the full range of the LVDT core position