1. Cable Extension Transducers Cale Ash CEE 398KUC

2. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential TransformersCable Extension Transducers Two Options: RangeUp To 12 in. ~$600 (12in.) Flexible cable, but has more moving parts Rod can bend, but fewer moving parts ~$400 (60in.) Up To 1700 in. Cost Durability

3. Types Cable Extension Transducers (CETs) Come In: Industrial Grade Laboratory Grade (Discussed here) As well as in various sizes: 1.53.512

4. Applications Cable Extension Transducers (CET): Measure Linear Position Indicate Velocity and Acceleration Provide Reliability and Serviceability >10 5 cycle life Cable user-serviceable

5. Superior Performance CETs are ideal in many instances: Where Perfect Alignment is Not Possible Cannot use LVDT Here! Where Large Displacements are Expected Up to 100 for Laboratory Models Up to 1750 (145ft.!) for Industrial Models

6. Superior Performance CETs are ideal in many instances (cont.): If Difficult Mounting Conditions are Encountered Pulleys Enable Additional Flexibility Rigid Support Far From Measuring Point

7. Technology Cable is wound around a precision machined spool attached to either a: Potentiometer (variable resistor, analog) Incremental Encoder (optical, digital) A spring provides controlled recoil of the cable. X-Ray Vision!

8. Instrumentation Measurement Options Include: Voltage Divider Unregulated Input Incremental Encoder Current Output NSEL Models

9. Models Used In NSEL Both models feature: Adjustable Zero & Voltage Output High Accuracy (+/- 0.25%) Multiple Extension Ranges: PT1DC 0-2in. to 0-50in. PT510 0-2in. to 0-100in. PT510 PT1DC

10. Availability LVDT CET

11. Summary CETs provide a useful, sometimes superior, alternative to LVDTs. Rotary potentiometer provides long life and simple output CETs are also cost effective and easy to install

12. References www.celesco.com CET Manufacturer http://cee.ce.uiuc.edu/nsel/Facility/ For instrument availability