Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear...
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![Page 1: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/1.jpg)
Cable Extension Transducers
Cale Ash
CEE 398KUC
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Measurement Problem
Need to measure linear distances/displacements:
LVDT CETLinear Variable Differential Transformers Cable 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
![Page 3: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/3.jpg)
Types
Cable Extension Transducers (CETs) Come In:
•Industrial Grade
•Laboratory Grade (Discussed here)
As well as in various sizes:
1.5” 3.5” 12”
![Page 4: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/4.jpg)
Applications
Cable Extension Transducers (CET):
•Measure Linear Position
•Indicate Velocity and Acceleration
•Provide Reliability and Serviceability
• >105 cycle life
•Cable user-serviceable
![Page 5: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/5.jpg)
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
![Page 6: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/6.jpg)
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
![Page 7: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/7.jpg)
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!
![Page 8: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/8.jpg)
Instrumentation
Measurement Options Include:
Voltage
Divider
Unregulated
Input
Incremental
Encoder
Current
Output
NSEL Models
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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
![Page 10: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/10.jpg)
Availability
LVDT CET
![Page 11: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/11.jpg)
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
![Page 12: Cable Extension Transducers Cale Ash CEE 398KUC. Measurement Problem Need to measure linear distances/displacements: LVDTCET Linear Variable Differential.](https://reader035.fdocuments.us/reader035/viewer/2022062511/55195435550346aa698b45ae/html5/thumbnails/12.jpg)
References
www.celesco.com CET Manufacturer
http://cee.ce.uiuc.edu/nsel/Facility/
For instrument availability