controlLVDTs

Precision Position Feedback for Aerospace and Industrial Applications

Aerospace (Commercial and Military)n Primary and Secondary Flight Control Systems n Engine Controls n Hydraulic Reservoirs n Cockpit Controls n Surface Indication n Thrust Vector Controls

Industrialn Machine Tools n Copiers n Micro - Hardness Testers n Paper Machine Controls n Steer By Wire Controls n Closed Loop Hydraulic Valve Positioning

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.

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.

DC to DC

Input-DC Output LVDTs are found in the commercial market-place. 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.

Widely Accepted for Transducer Service forn Reliability and robust construction n Non-contact frictionless operation n Repeatability / zero hysteresis n Ability to operate in severe environments n Hermetically-sealed options n Listed devices

LVDTs

Custom-designed 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

Progressive and Innovative Designs To Meet Increasingly Demanding Applications

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 inches

Mechanical 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 delivery of every order to specification, on time and on budget.

*Ratiometric offers high accuracy for the same cost.

PRODUCTS

n Linear

n Rotary

n Proportional

n Wet-pin

n Solenoid Valves

n Flame Arrestors

n LVDT

n Hazardous Location Valves

A WORKFORCE DEDICATED TO CONTINUOUS IMPROVEMENT, PROBLEM PREVENTION AND TOTAL CUSTOMER SATISFACTION.

Our investment in equipment and facilities is just part of our commitment to customer satisfaction. We demonstrate this commitment through the utilization of statistical process controls, Lean Manufacturing programs, training of suppliers and in-house personnel. It is this level of commitment and investment that makes LISK respected in the design and manufacture of Valves, Solenoids, LVDT’s and Flame Arrestors. Whatever your application – Sub-Sea petroleum extraction, transportation and refining, power generation, fuel dispensing and emission control – our teams are eager to satisfy your requirements every step of the way.

The result: dedication of every LISK employee to defect-free products.

Headquarters and Manufacturing Facility

G.W. Lisk Company, Inc. 2 South Street Clifton Springs, New York 14432 USA

Phone: 315-462-2611 Fax: 315-462-7661

E-mail: sales@gwlisk.com

European Manufacturing

Lisk Ireland Limited Ennis Road, Gort, Country Galway Republic of Ireland

Phone: 353-91-631711 Fax: 353-91-633011

E-mail: sales@gwlisk.ie

Asia Sales and Manufacturing

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

Phone: 86-512-62990128 Fax: 86-512-62990129

E-mail: sales@gwlisk.com

www.gwlisk.com