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Target Surfaces
The target material directly affects the output from the proximity probe system .
Drivers can be calibrated for many different target materials . If the target material
differs from the material the driver is calibrated to, the output will become
non-linear . Please see the complete list of compatible materials at ctconline .com .
For vibration monitoring of rotating shafts, the observed surface must have
a roughness not to exceed 32 µin . (< 1 micron) and must be concentric . False
vibration readings will result if the surface is rough or has discontinuities or
excessive mechanical run-out . The target area should be at the circumference
of a shaft and perpendicular to the probe tip to ensure measurement accuracy .
Linear range may be reduced if the target diameter < 0 .5 in . or shaft diameter
< 1 .2 in .
Note: Shaft diameters should be uniform in the target area and free of
keyways, oil slingers, or mechanical damage.
Setup and Adjustment
When all connections to the driver have been made and the probe is in place,
apply power to the system . For applications where the only data of interest is
vibration level, where measuring the gap is unnecessary, the voltage at the OUT
(signal output) terminal, relative to the COM (common) terminal, should be -7 .0
±5 V for a mid-range gap of 35 mils . Adjust the probe until this reading is obtained .
For applications where the actual gap needs to be measured, adjust the probe
until a reading is obtained that reflects the desired initial gap setting .
S S E E C C T T I I O O N N
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Target Surfaces
The target material directly affects the output from the system. Drivers are calibrated for SAE
4140 steel. If the target material differs from SAE 4140 steel, the output will become non linear
NOTE: Shaft diameters should be uniform in target area, and free of keyways & oil
slingers or mechanical damage.
Setup and Adjustment
25mm proximity probes are typically used for measuring differential expansion on steam
turbines. This is the measurement of the difference in the rotor expansion and casing
expansion.
When all connections to the driver have been made, and the probe is in place, apply
power to the system. Adjust the probe until the appropriate output is obtained.
Figure 6. Differential Expansion
Figure 7 - Differential Expansion
M N X 1 0 0 7 4 , R E V A ● 3 / 1 1 / 2 0 1 6
Connection Technology Center, Inc. ● 7939 Rae Boulevard ● Victor, NY 14564 ● (585) 924-5900
I I N N S S T T A A L L L L A A T T I I O O N N
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