Frequently Asked Questions
FAQs - Measurement
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• Sensor 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.
• 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.
7. How do I orient the sensor?
The Tester uses the driveshaft (depicted as a
thick red line in the display) as the primary frame
of reference. Orient the sensor to the driveshaft
using the sensor cable where it exits from the
sensor, telling the Tester whether the cable is
parallel or perpendicular to the shaft.
Quick Tip:
The first time you take a measurement, draw or
paint a line on the machine indicating sensor
measurement location, with an arrow indicating
sensor orientation. This will aid in ensuring the
consistency of future measurements.
8. Will the diagnosis be impacted if I cannot
reach all the measurement locations?
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