How to Calculate the Accuracy Retention Time of the Kistler 6125A Sensor?

The calculation of precision retention time lacks a set formula. Statistics of the real usage period from factory acceptance to surpassing the deviation limit serve as its foundation. Two real measurement steps are used to confirm the core:

Starting Point: After factory/installation calibration, calculation starts. At the factory, a brand-new sensor already satisfies the accuracy requirement. Timing can start after installation and a successful initial calibration; this is when accuracy retention starts.

Ending Point: When the accuracy deviation above the permissible limit, timing ceases. The nominal accuracy of the sensor-0.25%FS for the 6125A-determines the permissible threshold. The accuracy is deemed to have surpassed the limit when, following calibration, tests reveal a full-scale variance > 0.25%FS (or more than twice the nominal accuracy, i.e., 0.5%FS; requirements vary slightly between manufacturers). The sensor's real accuracy retention time at this point is its cumulative usage time.

Based on brand statistics of thousands of real items in use, the industry-provided 2.5–3.5 years is an average number. The timeframe for a single sensor must take into account the actual operating conditions and periodic calibration results.