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Sensor I® Expert User Manual
Application Guidelines for Accurate Use of the Expert Wrench
To all Expert wrench users
February 15, 1999
What distinguishes the Expert wrench from dial wrenches or other digital
torque wrenches is one very significant feature: angle. The angle
measurement allows users to accurately audit torque dynamically and
perform sophisticated tightening methods such as angle and yield control.
The EZ Angle sensor is a major improvement over previous technology. The
most obvious change is the removal of the external arm on the ratchet
head-eliminating the space constraint. In addition, users no longer need to
find a suitable place to attach the reference arm magnet.
Although the Expert wrench is a rugged industrial tool, to achieve precision
results, it needs to be treated as a precision instrument. The following
outline summarizes the ideal method of use:
Wrench Reset:
The reset process sets the zero reference for both torque and angle. The
wrench must be held steady with no torque applied to achieve a good reset.
It will indicate a fault if excessive torque or angle is applied while resetting.
For best results, attach the socket to the wrench and place it on the
fastener or rest the ratchet head on a table. Hold in the Reset button until
the green Run light illuminates and release. You can then move the wrench
to the fastener, or begin tightening immediately. To achieve angle accuracy
that is better than the documented performance specification place the
entire wrench on a table and hold it completely still during reset. This will
improve the angle accuracy to better than ±2% of the final angle.