Kaman KDM-8200 - Manual (Page 21)

21
Kaman Precision Products
The Equipment
Sensor Sensor mounting is critical to the operation and accuracy of the measuring system.
Mounting Fixturing must be stable through changing environmental conditions, such as
temperature variation or vibration. The impact of these changes is relative: a 0.00001"
change is negligible when only 0.001" accuracy is required.
Conductive
Simply keep in mind that fixturing must be capable of maintaining the accuracy required
vs. by your application. If you do need to mount the sensor, note that the sensor’s field may
Nonconductive interact with the fixture and change your system calibration. Shielded sensors will
interact less with a conductive fixture than unshielded sensors. When using a conductive
fixture, it is important that you calibrate your sensor channels with the sensor in place in
the application fixture, or in a fixture that duplicates the actual loading effects of the
application fixture. Loading is the effect of conductive material (other than the target)
that is positioned within 3 times the diameter of the sensor and is a permanent part of the
measuring environment.
Simulated
Install the sensor in the application fixture exactly as it was in the simulated one. When moving
vs. from the simulated fixture to the application fixture, deviations may occur through changes in
Application loading or in mechanical position. To ensure maximum accuracy, calibrate the sensor in the
Fixture actual application fixture whenever possible.
Conductive
Keep in mind the following general rule: Mount unshielded sensors 2.5 to 3 times their
Materials diameter away from conductive materials; for shielded sensors use a factor of 1.5 to 2 times
in the diameter.
Measuring
Area
SENSOR
VIEWING
AREA
SHIELDED SENSOR
1.5 TO 2X DIAMETER
UNSHIELDED SENSOR
2.5 TO 3X DIAMETER
SENSOR
VIEWING
AREA