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
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.