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Miniature Position Transducers

Miniature Position Transducers (String Potentiometers (String Pots))

position transducers that are flexible alternatives to linear potentiometers, encoders, LVDTs, and RVDTs These all-environment miniature displacement transducers are also referred to as draw wire transducers, string pots, string encoders, cable extension transducers, and yo yo pots. Complementary to LVDTs, encoders, linear potentiometers, and related displacement sensors, Firstmark Controls position transducers are noted for their small size, rugged performance, accuracy, flexible mounting, and easy installation.


Product Highlights
Product Key Features More Information
World's Smallest Cable Position Transducer
World's Smallest Cable Position Transducer
  1. 1.5-Inch (38-mm) Maximum Travel
  2. Analog Signal Using Precision Conductive Plastic Potentiometer
  3. AccuTrakTMGrooved Drum for Enhanced Repeatability
  4. Small, Robust Design
  5. Choice of Displacement Cable Pull Direction
  6. DirectConnectTM Sensor-To-Drum Technology = Zero Backlash, No Torsion Springs or Clutches
Data Sheet
Subminiature Size, Flexible Mounting
Subminiature Size, Flexible Mounting
  1. 6.5-Inch (165-mm) Maximum Travel (Series 176)
  2. Analog Signal Using Precision Conductive Plastic Potentiometer
  3. AccuTrak™ Grooved Drum for Enhanced Repeatability
  4. Bearing-Mounted Rotating Components
  5. Optional Flexible Mounting Bases
  6. Optional High-Tension Displacement Cable (Model 174-0321T)
  7. DirectConnect™ Sensor-To-Drum Technology = Zero Backlash, No Torsion Springs or Clutches
Data Sheet
Analog-Output Miniature Position Transducers
Analog-Output Miniature Position Transducers
  1. 42.5-Inch (1080-mm) Maximum Travel (Series 162)
  2. Analog Signal Using Precision Conductive Plastic/Hybrid Potentiometers
  3. AccuTrak™ Threaded Drum for Enhanced Repeatability
  4. Bearing-Mounted Rotating Components
  5. Optional Flexible Mounting Bases
  6. DirectConnect™ Sensor-To-Drum Technology = Zero Backlash, No Torsion Springs or Clutches
Data Sheet
Series 6 position transducer with integrated signal conditioning (4 to 20 mA, 0 to 5 V, and more)
Series 6 position sensor
  1. 85-Inch (2159-mm) Maximum Travel (Model 62)
  2. Choice of FlexSignal™ Analog and Digital Output Signals (Factory Set)
    • Voltage Divider
    • Low-Level Bridge (B Circuit / Strain Gage Compatible)
    • Voltage Conditioner
      • Flexible User Adjustable Zero and Span Controls
      • 0-5 VDC, 0-10 VDC, ±5 VDC, ±10 VDC, and more
    • 4-20 mA (Current Loop)
    • Quadrature (Standard- and High-Resolution Digital)
  3. AccuTrak™ Threaded Drum For Enhanced Repeatability
  4. DirectConnect™ Sensor-To-Drum Technology = Zero Backlash, No Torsion Springs or Clutches
  5. NEMA 4 / IP 66 Environmental Protection
  6. Flexible Mounting Bases
  7. Industrial Operating Temperature Ranges
  8. Choice of Electrical Terminations: MIL-C-5015, DIN 45326, Lemo, flying leads
News Release
Data Sheet




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Calculators and Tools Selecting Position Transducers Sinusoidal Motion
Displacement Cable Sag (Catenary) Position Transducer Linearity (Calibration)
Thermal Effect Total Cost of Ownership
Cable (String) Fundamental Frequency Displacement Cable Stretch
Voltage Divider / Power Zero / Span (Offset / Gain)
Sensor Total Cost of Ownership  

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