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
Standard Stud Mount Procedure
Standard Stud Mount Procedure
This mounting technique requires smooth, flat contact surfaces for proper operation and is recommended for
permanent and/or secure installations. Stud mounting is also recommended when testing at high frequencies.
Note
: DO NOT attempt mounting on curved, rough or uneven surfaces, as the potential for misalignment and
limited contact surface may significantly reduce the sensor’s upper operating frequency range.
Figure 6 – mounting surface preparation
1/4-28 Stud
1/4-28 Captive Screw
A (in)
0.250 0.250
B (in)
0.350 0.350
1 . 1 T im e s
S e n s o r D i a m e t e r
B
A
Torque (ft-lb)
2 to 5
2 to 5
STEP 1
First, prepare a smooth, flat mounting surface, and then drill and tap a mounting hole in the center of this
area as shown in Figure 6. A precision-machined mounting surface with a minimum finish of 63 µin [0,00016 mm]
is recommended. (If it is not possible to properly prepare the machine surface, consider using an adhesive
mounting pad as a possible alternative.) Inspect the area, checking that there are no burrs or other foreign
particles interfering with the contact surface.
STEP 2
Wipe clean the mounting surface and spread on a light film of grease, oil or similar coupling fluid prior to
installation.
Figure 7 – mounting surface lubrication
Adding a coupling fluid improves vibration transmissibility by filling small voids in the mounting surface and
increasing the mounting stiffness. For semi-permanent mounting, substitute epoxy or another type of adhesive.
STEP 3 HAND
-tighten the sensor/mounting stud to the machine, then secure the sensor with a torque wrench to
the mounting surface by applying the recommended mounting torque (see enclosed specification data sheet for
proper mounting torque). It is important to use a torque wrench during this step.
Under-torquing the sensor
may not adequately couple the device; over-torquing may result in stud failure and possibly permanent
damage.
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