Does my MRU need recalibration?

The MRU calibration certificate is valid for 4 years, and full product specification is maintained in this period under normal operating conditions.

Notes:

1. The specified heave accuracy is maintained over the MRU's lifetime, also without re-calibration.
2. Re-calibration and validation of the MRU every 4th year is recommended if the customer requires full product specification after expiration of a valid calibration certificate.
3. However, the specified accuracy in roll & pitch for a given model is usually met over the MRU's lifetime under normal operating conditions as Norwegian Subsea uses only validated sensors with exceptional stability.
4. The lifetime accuracy in roll & pitch, without re-calibration, will not exceed
   1. 0.1 degrees for the 3000 series
   2. 0.05 degrees for the 6000 series
   3. 0.035 degrees for the 9000 series
5. Thus, selecting a more accurate model than initially required may extend the calibration intervals or remove the need for re-calibration altogether.

In summary, for most applications, no recalibration is required. Examples:

1. The MRU 3000 for Helideck monitoring applications. The requirement is 0.1 degrees roll/pitch accuracy and the MRU 3000 will always stay within this accuracy requirement without recalibration.
2. The MRU 3000 Marine for DP systems roll/pitch sensor. The MRU 3000 will always stay within the accuracy requirement without recalibration.

Re-calibration and validation of the MRU is done in the factory in Oslo, Norway. Normal turn-around time is one week. Re-calibration includes a complete validation of the MRU, ensuring that the MRU is in full working order.