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Both accelerometers and strain transducers are compatible with Wireless Transmitters or with Traditional wired connections (data sent to the PDA via cables, which are available in various lengths). Both feature Smart Sensor technology, sending their calibration to the PDA model 8G.
Accelerometers may be Piezoelectric (PE) or Piezoresistive (PR). The PR accelerometer is recommended for all types of foundations and for instrumenting SPT rods.
Wireless Transmitters allow the PDA to be placed up to 100 m (more than 300 ft) away from the foundation being tested and include a rechargeable 8.5-hour life battery.
When using traditional sensors, basic dynamic testing in offshore environments including oil platforms and wind turbines requires special waterproofing of the sensors and cables. Since wireless sensors are used in marine projects, more efficient antennas can be used for PDAs. PDI "internal" waterproofing is an option for projects in wet environments, and the depth is less than that of typical offshore projects.
PDI also offers templates, anchors, and protectors for sensor installation.
For use with the Pile Driving Analyzer® (PDA)
Compatible with Traditional (cabled) connection or with Wireless Transmitter when used with PDA model 8G or PAX
Standard “Smart Sensor” technology.
Smart Sensors report their calibration to a PDA model 8G or PAX (PAX reporting in wireless mode only)
Effective Gage Length: 76 mm standard
Size: 126 x 35 x 11 mm
Material: Aluminum
Circuit: Full 350 ohm Wheatstone bridge
Cable: Shielded, available in standard length 1060mm (for cabled connection) or 450 mm (for use with Wireless
Transmitter), other cable lengths available on request
Nominal Sensitivity: 380 ?ε/mV/V
Strain Range: Nominally 3,000 ?ε (functional to 8,000 ?ε)
Shock Range: Nominally 5,000 g
Natural frequency when attached to foundation: greater than 2,000 Hz
Temperature Range: -50° to 120°C operating
Attachment Method: Bolts to pile (Optional C-clamps or tabs and adhesive for structural testing.)
Options: water resistant to 20 m depth, on request (PDI also offers waterproof strain transducers for water depths to 300 m)
* Pile Dynamics Strain Transducers may be used in static load monitoring and/or structural monitoring.
