How often do Pile Driving Analyzer® (PDA) sensors need recalibrated?


Pile Dynamics and the American Society for Testing and Materials (ASTM) D4945 recommend that sensors be recalibrated every two-years despite how often they are used.  Additionally, Pile Dynamics suggests that sensors exhibiting questionable data before two-years should be recalibrated. Pile Dynamics’ policy is to recalibrate any sensor returned to its Maintenance Department for checkup or repair.