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Percent Timer Setting Calculations

Older pivots only have a percent timer. Use this form to calculate a timer setting to apply a particular depth. For partial pivots use the numbers for a 360 degree, full rotation. Use the full rotation calculator to find the approximate amount of time it will take for a pivot to make a full rotation. Calculate the time for a 1" application.

Learn more about the units used on this page.

Percent Setting By Depth

Percent Setting by Desired Completion Time

Percent Setting By 1" Application

The Equations

These calculators use these formulas to determine the percent timer setting to achieve a specified application depth or completion time.

Percent Setting By Depth

Where:

= The new pivot percent timer setting to achieve desired depth (as a %)

= The pivot percent timer setting to achieve known application depth (as a %)

= Known application depth (in)

= Desired new application depth (in)

Percent Setting By Desired Completion Time

Where:

= The new pivot percent timer setting to achieve desired completion time (as a %)

= The pivot percent timer setting to at known completion time (as a %)

= Known completion time (hrs)

= Desired completion time (hrs)

Percent Setting By 1&quot Application

Where:

= The new pivot percent setting to achieve desired depth (as a %)

= Pivot full rotation time at 100% (hrs)

= Pivot full rotation time to apply 1 inch (hrs)

= Desired application depth (in)

Reference: Washington State University