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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
Series M position transducer for OEM applications
Series M position transducer for OEM applications
  1. 85-Inch (2159-mm) Maximum Travel in a Ø3.5-Inch (Ø89-mm) Package
  2. DirectConnect™ Sensor-To-Drum Technology = Zero Backlash, No Torsion Springs or Clutches
  3. Optimum Fleet Angle for More Repeatable Displacement Cable Wrap
  4. Fixed or Adjustable Mounting Features
  5. Compatible with Self-Tapping or User-Supplied Washer/Nut/Screws
  6. Low-Inertia Drum
  7. High-Strength Engineering Plastic Cover and Case
  8. Long-Life Spring (100,000 Full-Stroke Cycles Minimum)
  9. Choice of Analog (Voltage Divider Or Rheostat) or Digital (Quadrature) Sensors
  10. Upright Mounting Base (Optional)
  11. Flexible Signal Conditioning (Optional)
  12. Infinite-Resolution 360° Mounting Alignment
  13. RoundAbout™ Cable Exit Capable (Optional)
  14. Perfect for Cost-Sensitive, Large-Volume Applications
News Release
Data Sheet
Configuration List (Part Number List) (pdf)
Configuration Images by Part (pdf)
Mounting Options and Ideas (pdf)
Mechanical and Electrical Interface Details (pdf)
RoundAboutTM cable guide
RoundAbout™ cable guide
  1. Allows dynamic 3D displacement cable motion
  2. Gives 360° by 317° displacement cable orientation flexibility
  3. Unique curved cable guiding surface allows for dynamic displacement cable motion
  4. Rugged anodized aluminum, shielded stainless steel bearings, and engineering plastics construction
  5. Mountable on the position transducer or via independent mounting base
  6. Reduces the need for flexible position transducer mounting bases
  7. Saves time: no need to re-locate or re-orient the position transducer after installation
RoundAboutTM cable guide
News Release
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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Displacement Cable Sag (Catenary) Position Transducer Linearity (Calibration)
Thermal Effect Total Cost of Ownership
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