# PrT - Prevailing Torque

Tools
ES STR SL ST SR QST STB IXB

The monitor calculates the prevailing torque value in the Window Length and checks that it is between the Torque limits. The Angle Window starts at the angle degrees set in Start Angle in reverse direction from the shut-off point. This then spans for the angle degrees set in Angle Window Length in reverse direction. If Start Angle is left blank the angle window starts at the shut-off point. The calculated prevailing torque value is the mean or peak torque value (depending on the parameter set by the user) during the Window Length. The calculated value is saved as result data Prevailing Torque Measured. If Torque compensation is set to On, the Prevailing Torque Measured will be subtracted from all torque result values in consecutive steps. Any previously calculated prevailing torque compensation values will no longer be subtracted from torque result values. If Torque compensation is set to Off, no subtraction will be made in consecutive steps.

If the total angle of the step is less than the Start Angle plus Window Length, then the monitor will report NOK.

Prevailing torque can be measured as an average of measured values, or at peak torque. To choose between these two modes, set the Use Value parameter to either Mean torque (for average values), or Peak torque (for peak value).

Parameter | Description
--- | ---
Torque Compensation | On or off.
Start Angle | Must be > 0
Window length | Must be >= 0
Low Limit | Must be > 0
High Limit | Must be >= 0
Use value | Mean torque (for average values), or Peak torque (for peak value).