The electromagnetic field produced by Kaman's eddy current sensors extends in front of the sensor face, radially from the sensor face, and to a small degree behind the sensor face. Any electrically conductive material in the sensor field can affect the system output. Because of this, care must be taken when installing sensors to ensure that maximum sensitivity of the system is achieved


Shielded Sensors
The stainless steel housing of shielded sensors typically extends to the face of the sensor. This results in the electromagnetic field from a shielded sensor being somewhat smaller than that of an unshielded sensor. The drawing below depicts the size and shape of the electromagnetic field produced by a shielded sensor. It also shows a typical recommended bracket mount and recess mount.


Shielded sensor image


















Unshielded Sensors
In unshielded sensors, the sensor face containing the coil extends in front of the stainless steel housing. This allows for a larger electromagnetic field and the larger calibrated ranges typical of unshielded sensors.


Unshielded sensor image




















Deviating From Typical Mounting
In some applications it is impossible to maintain the clearances specified in the drawings. This does not mean that a precise measurement is impossible to make. Conductive material other than the target that engages the field is called side loading. Calibration with simulated side loading can, in most cases, eliminate the concern. Contact Kaman for application assistance.




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