Linear Variable Displacement Transducers (LVDTs)

LVDT's provide an extremely reliable solution for a precise linear displacement (position) and gauging measurement. They can be used wherever a physical displacement or position needs to be converted into an electrical signal for indication or control purposes. All LVDT’s feature contactless operation ensuring long life and no degradation of performance with respect to time or number of cycles.

Sentech’s Linear Variable Differential Transformers are designed with the highest level of quality.  These LVDT’s have been used in many applications over the past 30 years, including Power Generation, Nuclear Turbines, Gas and Steam Turbines and in many Commercial and Military Aerospace applications and other high reliability and harsh environmental applications.

Sentech offers pressure sealed LVDT’s for use in harsh, dirty environments, such as those found in heavy industrial plants and processes. With housings constructed of stainless steel, these units can sustain pressure of up to 5000 psi (345 Bar) and, when properly equipped, can even operate fully immersed in liquids and fluids with very high pressure like 30000 PSI (2070 Bar).


Single-Channel LVDT Sensors

A Single Channel LVDT (Linear Variable Position Transformer) is the most commonly used device. It consists of a single core with a moveable armature.

Sentech’s single channel LVDT offers position feedback for many industrial, commercial, and military aircraft systems. With a high accuracy linear position sensor, these LVDTs are compatible with a range of mounting configurations.

Combined with its rugged construction, Sentech’s LVDT’s offers high performance and reliability along with resistance to shock and vibration occurring in most industrial and aerospace applications.

Sentech also offers a wide range of mounting configurations and pressurized units.

Multi-Channel LVDT Sensors

Sentech’s multi-channel LVDT’s (Linear Variable Position Transformer) offer redundancy in case of a sensor break or failure. Sentech offers multiple channels (coil assemblies) in a single housing. Each channel will feature its own armature attached to the common plate or a common armature, having an important feature for a controlled channel-to-channel tracking accuracy.

Key Features

  • Measure range from 0.005”(0.13mm) to 70” (1780 mm)
  • Linearity +/- 0.25% F.S. Typical
  • MTBF: > 1,000,000 or Higher
  • Temperature: -65° F to +400° F (-54° C to 205° C)
  • Redundancy:  1, 2, 3 or 4 channels
  • Qualifications to RTCA DO-160 and MIL-STD-810E
  • Certifications: Hazardous Area for Intrinsic Safe and/or Non-Incendive Protections per UL, CSA, IECEX standards and ATEX Directives.

Typical Applications

  • Flight control actuators
  • Valves
  • Engine bleed air systems
  • Fuel controls
  • Fly-by-wire systems
  • Brake-by-wire systems
  • Environmental control systems
  • Gas Turbines
  • Steam Turbines
  • Nuclear Turbines
  • Hydraulics
  • Tests and Measurements
  • Packaging
  • Robotics
  • Automation
  • Marine and subsea application
  • Weigh Scales
  • Pulp and paper industry
  • Oil & Gas exploration
  • Seismic Testing
  • Automotive testing

Custom Applications

Typical applications include servo or other control applications or for monitoring applications. Our sensors are in service in hydraulics, machine tools, material testing, semiconductor equipment, in the aerospace industry as well as military vehicles.

Sentech offers a wide variety of configurations and capabilities:

  • Outside diameters from 0.312″ (7.92 mm) to 1.500″ (38.1 mm)
  • Linear Strokes up to 70″.
  • A variety of mounting options – mounting blocks, SAE hydraulic fittings, flange mounts, brackets, etc.
  • Units with isolation tubes (pressure tubes)
  • Metric sizes and core threads
  • Units with large clearance between body and moveable core
  • Units with high stroke to body length ratio
  • Connector or Cable terminations
  • Pressure Sealed units
  • Miniature units, small package, low mass cores – high response
  • Redundant LVDT’s
  • Variety of input/output combinations for DC/DC units (see selection guide)
  • High-Temperature units
  • MIL-SPEC electronics

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