The Pile Driving Analyzer® system (PDA) reads and processes electronic signals collected by Accelerometers and Strain Transducers.
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 Traditional sensors are used, dynamic testing of foundations in offshore environments including oil platforms and wind turbines require special waterproofing of sensors and cables. Since wireless sensors are used in offshore projects, a more potent antenna is available for the PDA. PDI “in house” waterproofing is an option for projects in wet environments at smaller depths than typical offshore projects.
PDI also offers templates, anchors, and protectors for sensor installation.