Kaman KDM-8200 - Manual (Page 22)

22
Kaman Precision Products
The Equipment
Surface
Surface mounting will not affect a sensor’s calibration assuming there is nothing conductive in
Mounting the sensor’s “viewing range” other than the target. When surface mounting in a conductive
fixture, the sensor face of an unshielded sensor should be 2.5 to 3 times its diameter away from
the fixture. The factor for shielded sensors is 1.5 to 2 times the diameter.
2.5 TO 3X
SENSOR
DIAMETER
1.5 TO 2X
SENSOR
DIAMETER
UNSHIELDED SHIELDED
SENSOR
DIAMETER
SENSOR
DIAMETER
Flush
Flush mounting in a conductive fixture requires a cut-out area around the sensor head. The
Mounting depth and width of the cutout are relative to sensor face diameter as shown in the diagram below.
The cutout should never be any smaller than the dimensions arrived at by making these
calculations. Smaller width and/or depth can result in loading effects so severe that you may not
be able to calibrate the system. The cut-out area may serve as a collection point for refuse, metal
filings, cutting oils, coolants, etc. It may also disrupt the gaseous or liquid flow patterns in the
measurement area. You can effectively solve this problem by backfilling the cut-out area with a
nonconductive material, such as silicon rubber or epoxy.
.
SENSOR
DIAMETER
NEVER RECOMMENDED
2.5 TO 3x
SENSOR
DIAMETER
1.5 TO 2X
SENSOR
DIAMETER
1/4 TO 1/2x
SENSOR
DIAMETER
1.5 TO 2 x
SENSOR
DIAMETER