S
E
N
S
O
R
S
A
N
D
IN
S
T
R
U
M
E
N
T
A
T
IO
N
F
O
R
M
A
C
H
IN
E
C
O
N
D
IT
IO
N
M
O
N
IT
O
R
IN
G
S
A
N
D
IN
S
T
R
U
M
E
N
T
A
T
IO
N
F
O
R
M
A
C
H
IN
E
C
O
N
D
IT
IO
N
M
O
N
IT
O
R
IN
G
Magnetic Mount Procedure
Magnetic Mount Procedure
Magnetic mounting provides a convenient means for making portable measurements and is commonly used for
machinery monitoring and other portable or trending applications.
Note: The correct magnet choice and an adequately prepared mounting surface is critical for obtaining reliable
measurements, especially at high frequencies. Poor installations can cause as much as a 50% drop in the sensor
frequency range.
Not every magnet is suitable for all applications. For example, rare earth magnets are commonly used
because of their high strength. Flat magnets work well on smooth, flat surfaces, while dual-rail magnets
are required for curved surfaces. In the case of non-magnetic or rough surfaces, it is recommended that
the user first weld, epoxy or otherwise adhere a steel mounting pad to the test surface. This provides a
smooth and repeatable location for mounting.
Figure 9 – magnet types
Dual-Rail Magnet
Flat Magnet
Sensor Stud Mounts to
Top Surface of Magnet
ALL SURFACES SHOULD BE FLAT AND SMOOTH
Mounting Pad
with Magnet
STEP 1
After choosing the correct magnet type, inspect the unit, verifying that the mounting surfaces are flat and
smooth.
STEP 2
Stud-mount the accelerometer to the appropriate magnet according to the guidelines set forth in Steps 2
and 3 of the Standard Stud Mount Procedure.
STEP 3
Prepare a smooth, flat mounting surface. A minimum surface finish of 63 µin [0,00016 mm] generally
works best. After cleaning the surface and checking for burrs, wipe on a light film of silicone grease, machine oil
or similar-type coupling fluid.
STEP 4
Mount the magnet/sensor assembly to the prepared test surface by gently “rocking” or “sliding” it into
place.
Note
: Magnetically mounting accelerometers carelessly has the potential to generate very high (and very
damaging) g levels. To prevent damage, install the assembly gently. If unsure, please contact the factory for
assistance.
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Summary of Contents for IMI SENSORS HT640B02
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