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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

Cable Extension Transducers

Cale Ash

CEE 398KUC

measurement problem
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

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

1.5”

3.5”

12”

applications
Applications
  • Cable Extension Transducers (CET):
  • Measure Linear Position
  • Indicate Velocity and Acceleration
  • Provide Reliability and Serviceability
    • >105 cycle life
    • Cable user-serviceable
superior performance
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!
superior performance1
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
technology
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.
instrumentation
Instrumentation

Measurement Options Include:

Voltage

Divider

Current

Output

Incremental

Encoder

Unregulated

Input

NSEL Models

models used in nsel
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

summary
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
references
References

www.celesco.com CET Manufacturer

http://cee.ce.uiuc.edu/nsel/Facility/

For instrument availability