Fluke 810 User Manual page 133

It is recommended to take two measurements
from each component in the drive train, if the
driving motor has more than 40 hp (30 kW) and
longer than 40 inches (102 cm) between
bearings. For equipment with less than 40 hp
and less than 40 inches between bearings, one
measurement is sufficient.
Quick Tips:
•
Locate the sensor as close as possible to
the bearing, or on a solid structural member
leading to the bearing
•
Sensor cable position should be parallel or
perpendicular to the drive shaft whenever
possible.
•
Avoid mounting the sensor on thin surface
areas (i.e. fan shrouds) and cooling fins.
•
Attach the sensor to a clean, flat, bare metal
surface if possible. Thick layers of paint,
grease, oil or other matter will reduce both
the holding force of the magnet and the high
frequency response of the sensor.
•
For consistent diagnosis over time, it is
important to place the tri-axial Sensors at
the exact same orientation and location on a
machine before you take a measurement.
Frequently Asked Questions
FAQs - Measurement
•
Do not take bearing measurements from a
foundation or fabricated base.
•
Do not mistake seal locations for a bearing
measurement location on pumps.
Note
Refer to the Quick Reference Guide for further
guidance on sensor locations.
6. Why is sensor orientation important?
The tri-axial sensor (provided with the Tester)
can collect vibration signals from three different
axes simultaneously. The orientation setup in
the Setup routine helps the Tester properly
correlate vibration signals to each of the three
axes. Mounting the sensor in different locations
and even changing the orientation by
90 degrees can cause a change in the
directional signal picked up from one channel of
the sensor. Therefore, it is critical to ensure the
sensor orientation setup in the Tester matches
the actual orientation of the sensor as placed on
the machinery.
A
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