LVDT Technical Information – Precision Position Feedback for Aerospace and Industrial Applications

Lisk LVDT Technical Information

Common Applications

Aerospace (Commercial and Military)

  • Primary and Secondary Flight Control Systems
  • Engine Controls
  • Hydraulic Reservoirs
  • Cockpit Controls
  • Surface Indication
  • Thrust Vector Controls

Industrial

  • Machine Tools
  • Copiers
  • Micro – Hardness Testers
  • Paper Machine Controls
  • Steer By Wire Controls

Features and Benefits

Custom-designed and manufactured to meet and exceed the
most stringent requirements.

  • Short Stroke to Long Stroke
  • Single to Multiple Channels
  • AC or DC Operation
  • Pressurised and Unpressurised

Widely Accepted for Transducer Service for

  • Reliability and robust construction
  • Non-contact frictionless operation
  • Repeatability / zero hysteresis
  • Ability to operate in severe environments
  • Hermetically-sealed options
  • Listed devices

AC to AC and DC to DC Details

AC to AC

AC Input-AC Output LVDTs are used primarily in military and aerospace applications. For these LVDTs, moving the probe from its fully extended to fully inserted position provides maximum output through null (minimum output) back to full output for a reversed phase.

AC Input-AC Output LVDTs

DC to DC

Input-DC Output LVDTs are found in the commercial marketplace. In this version, displacement of the probe creates an imbalance in the transducer coils, resulting in changing DC voltage as the core moves from fully extended through null to fully retracted.

Input-DC Output LVDTs

NEC Division System Gas & Dust Groups

Area Group Representative Materials
Program • End Item
• Application: engine, flight surface, thrust reverser, servo valve, steering, etc
To suit application
Commercial or Military Specify
Annual Quantities Specify
Target Price Specify
Number of Channels 1, 2, 3 or 4
Electrical Stroke Symmetrical about null or biased ± .015 inches – ± 14 inches
Mechanical Stroke Symmetrical about null or biased ± .015 inches – ± 14 inches
Type AC or DC To suit application
Excitation Voltage and frequency 3.5 Vrms to 7.5 Vrms
1500 Hz to 10,000 Hz
Demodulation Ratiometric or diffv To suit application*
Sensitivity Specify To suit application
Accuracy % of full scale output ±0.5% for ratiometric
Over -55°F to 275°F
Input impedance Minimum To suit application
Output Impedance Maximum per secondary
Load Impedance Resistive and capacitive load
Dielectric Strength Voltage and duration 1500 V, all wires to case
Temperature Range Specify -70°F to 350°F
Pressure Operating, proof and burst 10,000 PSI proof pressure
Envelope Body length & diameter To suit application
Electrical Interface Lead wires or connector
Mounting Flange, threads, etc.

*Ratiometric offers high accuracy for the same cost.