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 of LVDT’s

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

AreaGroupRepresentative Materials
Program• End Item
• Application: engine, flight surface, thrust reverser, servo valve, steering, etc
To suit application
Commercial or MilitarySpecify
Annual QuantitiesSpecify
Target PriceSpecify
Number of Channels1, 2, 3 or 4
Electrical StrokeSymmetrical about null or biased± .015 inches – ± 14 inches
Mechanical StrokeSymmetrical about null or biased± .015 inches – ± 14 inches
TypeAC or DCTo suit application
ExcitationVoltage and frequency3.5 Vrms to 7.5 Vrms
1500 Hz to 10,000 Hz
DemodulationRatiometric or diffvTo suit application*
SensitivitySpecifyTo suit application
Accuracy% of full scale output±0.5% for ratiometric
Over -55°F to 275°F
Input impedanceMinimumTo suit application
Output ImpedanceMaximum per secondary
Load ImpedanceResistive and capacitive load
Dielectric StrengthVoltage and duration1500 V, all wires to case
Temperature RangeSpecify-70°F to 350°F
PressureOperating, proof and burst10,000 PSI proof pressure
EnvelopeBody length & diameterTo suit application
Electrical InterfaceLead wires or connector
MountingFlange, threads, etc.

*Ratiometric offers high accuracy for the same cost.