robot torque sensor have no sensitivity to the target material provided it is conductive. Eddy-current sensors are sensitive to material differences and must be calibrated to the application’s target material.

When using multiple probes, capacitive sensors must be synchronized, but can be mounted close together without interference. Even when synchronized, eddy-current probes will interact if mounted close together. When this is unavoidable, special calibration can be used but is only available with digital sensors like the Lion Precision ECL202.

A capacitive probe’s small sensing field, which is directed only at the target, prevents it from sensing mounting hardware or nearby objects. Eddy-current’s large, surrounding sensing field can detect mounting hardware or other objects if they are too near the sensing area.

miniature torque sensor between the two technologies: resolution and bandwidth. Capacitive sensors have higher resolutions than eddy-current sensors making them a better choice for very high resolution, precise applications.