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String Pot Sensor

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Product Description

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

Features

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  • NOTE: SPOT's use a specialised version of SMT data loggers, standard data loggers (DAQ's) are not compatiable
    • Existing Dataloggers can be modifed by SMT for use with the SPOT sensors
    • A3 adaptor boards are user changeable, allowing the A3 to be adapted to suit the sensors being monitored (Advanced users only)
  • 50mm Measuring Range used for floor to floor compression
  • 250mm Measuring Range used for full building and large scale monitoring
  • 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

Functional Specifications

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Specifications SPOT-00-50mm

Measuring Range: 50mm

Linearity (Conductive Plastic Pot P50):

≤ ±0.5% FSO (≤ ±0.25mm)

Resolution (with A3/WiDAQ): 0.1mm

 

Specifications SPOT-00-150mm

Measuring Range: 150mm

Linearity (Hybrid Pot P25):

≤ ±0.25% FSO (≤ ±0.375mm)

Resolution (with A3/WiDAQ): 0.1mm

 

Specifications SPOT-00-250mm

Measuring Range: 250mm

Linearity (Hybrid Pot P10):

≤ ±0.25% FSO (≤ ±0.25mm)

Resolution (with A3/WiDAQ): 0.1mm

 

FSO = Full Scale Output

 

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

 

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

    • NOTE: SPOT's use a specialised version of SMT data loggers, standard data loggers (DAQ's) are not compatiable
      • Existing Dataloggers can be modifed by SMT for use with the SPOT sensors
      • A3 adaptor boards are user changeable, allowing the A3 to be adapted to suit the sensors being monitored (Advanced users only)
    • 50mm Measuring Range used for floor to floor compression
    • 250mm Measuring Range used for full building and large scale monitoring
    • 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 P50):

    ≤ ±0.5% FSO (≤ ±0.25mm)

    Resolution (with A3/WiDAQ): 0.1mm

     

    Specifications SPOT-00-150mm

    Measuring Range: 150mm

    Linearity (Hybrid Pot P25):

    ≤ ±0.25% FSO (≤ ±0.375mm)

    Resolution (with A3/WiDAQ): 0.1mm

     

    Specifications SPOT-00-250mm

    Measuring Range: 250mm

    Linearity (Hybrid Pot P10):

    ≤ ±0.25% FSO (≤ ±0.25mm)

    Resolution (with A3/WiDAQ): 0.1mm

     

    FSO = Full Scale Output

     

    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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