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Cable Extension Transducers

Cable Extension Transducers. Cale Ash CEE 398KUC. Measurement Problem. Need to measure linear distances/displacements:. Two Options:. LVDT. CET. Linear Variable Differential Transformers. Cable Extension Transducers . Up To 12 in. Range. Up To 1700 in. ~$600 (12in.). Cost.

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Cable Extension Transducers

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  1. Cable Extension Transducers Cale Ash CEE 398KUC

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

  3. Types • Cable Extension Transducers (CETs) Come In: • Industrial Grade • Laboratory Grade (Discussed here) • As well as in various sizes: 1.5” 3.5” 12”

  4. Applications • Cable Extension Transducers (CET): • Measure Linear Position • Indicate Velocity and Acceleration • Provide Reliability and Serviceability • >105 cycle life • Cable user-serviceable

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

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

  7. Technology X-Ray Vision! • 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.

  8. Instrumentation Measurement Options Include: Voltage Divider Current Output Incremental Encoder Unregulated Input 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. PT1DC PT510

  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

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