LVDTPrecision Position Feedback for

Aerospace & Industrial Applications

Control

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 • Closed Loop Hydraulic Valve Positioning

Progressive and Innovative Designs to Meet Increasingly Demanding Applications

LVDTsDesigned and Manufactured to meet and exceed your most stringent requirements.• Short Stroke to Long Stroke• Single to Multiple Channels• AC or DC Operation• Pressurized and Unpressurized

Technical OverviewThe linear variable differential transformer (LVDT) consists of housing containing a primary coil and two secondaries (wound in series opposition). The movement of a permeable core (shaped like a rod) through the transducer’s hollow center provides an output which is linear with the movement of the core.

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 ACAC Input-AC Output LVDTs are used primarily in military and aerospace applications. For the 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.

DC to DCInput-DC Ouput 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.

DESIGN & ANALYSIS 3D CAD design capability. Element (including finite) analysis in vibration, shock, temperature, magnetic, flow, heat transfer, and stress.

R&D LABORATORY Electrical characteristics, operational performance including pneumatic and hydraulic pressure/flow stands, response time, life cycling, evaluation of new processes, features, and new product development.

NDT TESTING & MATERIAL ANALYSIS Non-Destructive Testing services that includes x-ray, visual, and Dye Penetrant inspection.

ENVIRONMENTAL TESTING Including, but not limited to shock, vibration, salt spray, humidity, high (1000F) and low (-150F) temps, altitude to 100,000 feet, and other testing as required.

HYDRAULIC TESTING Up to 75HP, 60,000 PSI

PACKAGING Commercial, military, environmental storage, custom, VPCI, and returnable packaging and cleaning.

MANUFACTURING ENGINEERING In-house Tool/Machine design and build capabilities.

CNC WINDING MACHINES, COMPUTER AUTOMATED TEST STANDS Reduces manual testing time and cost and eliminates operator error.

CNC MACHINES Multi-axis, vertical and horizontal turning and milling as well as automatic manufacturing cells.

SCREW MACHINES Six spindle, eight spindle chucking and bar.

WELDING/BRAZING Electron beam, gas tungsten arc welding, laser, induction, heliarc, spot welding, and brazing.

PLATING Cadmium, zinc, electroless nickel, zinc phosphate, chemical film on aluminum, anodize, passivate, Zinc Nickel and others.

PRESSURE MOLDING Transfer and injection coil overmolding.

INTERNATIONAL STANDARDS Meets or exceeds many international certification standards.

PARAMETER OPTION REQUIREMENTProgram • End Item

• Application: engine, flight surface, thrust reverser, servo valve, steering, etc.

To suit applicationCommercial 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 inchesMechanical Stroke Symmetrical about null or

biased

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 applicationOutput 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 applicationElectrical Interface Lead wires or connector

Mounting Flange, threads, etc.

Total In-house Capability for Design, Development & ManufactureOur philosophy of maintaining complete control of the design, manufacture, and quality of LISK products has led to a substantial investment in equipment, facilities, and training. This enables deliv-ery of every order to specification, on time and on budget.

*Ratiometric offers high accuracy for the same cost.

PRODUCTS

www.gwlisk.com

DEDICATED TO CONTINUOUS IMPROVEMENT AND TOTAL CUSTOMER SATISFACTION.

Our investment in equipment and facilities is just part of our commitment to customer satisfaction. We also demonstrate it through the use of statistical process controls, Lean Manufacturing programs and continuous personnel and supplier training. It is this level of dedication and investment that makes LISK a global leader in the design and manufacture of Solenoids, Solenoid Valves, Sensors, Flame Arrestors and Intelligent Integrated Sub-Systems.

LISK. ACTIVATING THE WORLD.

Headquarters and Manufacturing FacilityG.W. Lisk Company, Inc. 2 South Street Clifton Springs, New York 14432 USA

Phone: 315-462-2611 Fax: 315-462-7661E-mail: sales@gwlisk.com

European ManufacturingLisk Ireland Limited Ennis Road, Gort, County Galway Republic of Ireland

Phone: 353-91-631711 Fax: 353-91-633011E-mail: sales@gwlisk.ie

Asia Sales and ManufacturingLisk Control Technology Co., LTD Suzhou Industrial Park (SIP) No.9, Hongfeng Road Jiangsu, P.R. China 215021

Phone: 86-512-62990128 Fax: 86-512-62990129E-mail: sales@gwlisk.com

MARKETS

Aerospace

Defense

Engine Management

Off Highway

Industrial

Power Generation

Medical

Solenoids Solenoid Valves

Sensors Flame ArrestorsOil & Gas

Rev. 5