A String Pot or Draw Wire sensor are sensors used for vertical displacement material compression and creep monitoring.

 

The sensors are typically packaged in a NEMA rated enclosure with an extended wire attached to it allowing it to span from floor to floor in a building. Depending on the expected travel, different models are available. The compact size, wide variety of travel ranges and favorable price as compared to LVDTs make this sensor attractive in a variety of different applications. See ASTM publication Volume 41, Issue 4 (July 2013) titled Monitoring of Vertical Movement in Four-Story Wood-Frame Building in Coastal British Columbia for detailed information on how String Pots can be used to monitor vertical displacement and compression of buildings.

 

Click to view product datasheet

String Pot Sensor

$450.00Price
    • 50mm Measuring Range used for floor to floor compression
    • 250mm Measuring Range used for full building and large scale monitoring
    • Compatible with SMT WiDAQ and A3/A2 Dataloggers
    • Mounted in NEMA rated enclosure with ½” conduit interface
    • Draw wire extensions available up to 300 feet
    • Different terminations and hook boxes are available depending on the mounting requirements
  • Specifications SPOT-00-50mm

    Measuring Range: 50mm

    Linearity (conductive plastic pot): ±0.5% FSO

    Resolution (with A3/WiDAQ): 0.1mm

     

    Specifications SPOT-00-250mm

    Measuring Range: 250mm

    Linearity (wire pot:) ±0.25% FSO

    Resolution (with A3/WiDAQ): 0.1mm

     

    Environmental

    Operating Temperature: -20° to 80°C

     

    Mechanical

    Material: Housing: Plastic. Draw wire: stainless steel

    Wire Mounting: Eyelet

    Housing: NEMA rated enclosure with grommet for analog wire.

    Wire Acceleration: ~5g

    Wire Retraction Force (min): ~1N

    Wire Extension Force (max): ~2.5N

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