How often do the Pile Integrity Tester (PIT) accelerometer and instrumented hammer need to be re-calibrated?
Pile Dynamics recommends that the PIT Accelerometer and the PIT Instrumented Hammer be recalibrated every two years, regardless of how much they have been used during that period. It should be noted, however, that these calibrations are only important in case of simultaneous force and velocity measurements. When tests are performed with the accelerometer only (velocity only) the data is normalized and the actual velocity amplitude is not relevant.
It should be noted that Pile Dynamics has a policy of recalibrating any Accelerometer or Instrumented Hammer that is returned to its Maintenance Department for check-up or repair.