Permanent Mounting; Setting Up The Tachometer - Commtest Instruments vbBalancer Instrument Reference Manual

Keep the accelerometer clear from other cables, ensuring it
•
is not twisted, kinked or tangled.

Permanent Mounting

To mount using the stud method, prepare a mounting spot on the
machine following the specifications shown in the diagram below.
Unscrew the magnetic base from the sensor and screw onto
•
the threaded stud. We recommend you use a thread locking
compound.
Caution: Do not use a wrench to tighten the accelerometer as this
may damage the sensor.

Setting up the Tachometer

A tachometer collects information on a machine's rotation speed,
providing you with an exact reading of machine speed as a
measurement is taken. This is more accurate than using a default
RPM as a machine's speed can vary significantly under different
loads.
The tachometer also provides information on the angle at which the
rotor is vibrating. The angle is measured from a fixed reference mark
on the rotor and is called the 'phase angle'. To balance a rotor it is
necessary to consider not just the amplitude of vibration but also the
phase angle. The amplitude shows the severity of the imbalance and
the phase angle indicates the geometry of the imbalance.
Warning: The laser tachometer is a class 2 laser product. Do not
stare into the laser beam.
32 Section 3: Using Sensors
Stud Mounting Spot