A full range of mounting hardware for industrial applications
The tools you need
for vibration monitoring
starts here
1
SENSORS
are mounted to rotating equipment at each
bearing housing to measure the machine’s vibration
levels. The sensor translates vibration to an electrical
signal sent to a measurement device.
including handheld
data collectors and
reference sources
are useful tools for
all analysts, in both
permanent and
portable installations.
INSTRUMENTATION
5
COMPLETE VIBRATION
MONITORING SOLUTION
2
MOUNTING HARDWARE
–
a range of studs, cementing
pads, and magnet mounts
– is needed to permanently
or temporarily attach the
sensor to the machine.
Wilcoxon offers complete vibration
monitoring solutions for permanent sensor
installations or walkaround monitoring.
Permanent sensors offer consistency and
simplified access to data, while temporary
installations allow greater flexibility, usually
at a lower cost.
The best monitoring approach will vary
depending on the application, but in any
installation, proper sensor mounting is
crucial for reliable data. We offer the full
range of tools you need and the expertise
you can rely on to get the job done.
collection point for up to 48 sensors,
improve safety, and simplify access
to critical machine information.
ENCLOSURES
create a central data
4
3
CABLE ASSEMBLIES
carry the
signal from the sensor. Choose a
suitable cable for the environment,
with the appropriate connectors for
the sensor and termination ends.
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Mounting considerations
The best mounting configuration depends on the machine being monitored, the type
and location of the sensor, the frequency range of interest, and whether the mount will be
permanent or temporary. The most important considerations are dynamic measurement
requirements, such as frequency response and amplitude.
Frequency range
The mounting location of each sensor should be based on the characteristics of the machinery to be monitored. The dynamic measurement requirements of
frequency response and amplitude should be evaluated against the frequency range of the mounting method. Each mounting method has a different effect
on a sensor’s operating frequency range.
Accelerometers have a natural resonance 2 to
5 times higher than the data sheet specified
upper-end frequency response. The goal of
measurement is to utilize the flat portion of
the frequency response (the portion between
the upper and lower 3 dB limit) for the best
characterization of vibration levels. To ensure
optimal response, careful attention should
be made to the contact surface area and the
proximity to the actual source of the vibration.
The closer the contact between sensor and
machine, the better the ability to couple and
measure high frequencies.
Probe tip
Frequency
range, max
2-pole
magnet
Flat
magnet
10,000 Hz
Cementing
pad
10,000-
15,000 Hz
Adhesive
30,000-
45,000 Hz
Best
Stud
Max sensor
response
500 -1,000 Hz 2,000 - 5,000 Hz
Acceptable
Good
Surface
Wilcoxon’s rugged sensors are designed to operate continuously in harsh industrial environments. Consideration of mounting surface and wiring requirements
will ensure optimal performance of the sensor throughout the lifetime of the machinery being monitored. The accuracy of high frequency signals is dependent on
how direct and rigid the contact is between the sensor and the machine. Adequately preparing the mounting surface provides the best performance and output
of reliable data ensuring an accurate assessment of machine condition.
Tips:
»
Mount sensors in a location that minimizes the vibration transmission route from the driving point source of vibration (shaft) through the machine to the
sensor. This is most often the bearing casing
»
Avoid mounting the sensor on thin sections, guards or vibration-free areas (antinodes), or areas with extreme temperature variations
»
Use a silicon grease to increase the performance of permanently mounted sensors
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Permanent mounting solutions
For permanent installations, the sensor can be mounted on the
machine with mounting studs or cementing pads. To help you
get the most accurate, reliable measurements in any conditions,
Wilcoxon offers a wide selection of hardware.
Mounting studs
Stud mounting is the most reliable mounting option because it can achieve the sensor’s
maximum frequency range and is highly recommended for permanent monitoring
systems, high-frequency testing and harsh environments.
Top-exit sensors are installed by using a double-ended stud. One end is inserted into
a threaded hole in the base of the sensor, and the other end is inserted into a properly
prepared threaded hole in the machinery. Side-exit sensors are installed by using a captive
screw that runs through the body of the sensor and exposes the threads underneath the
base, which can be threaded directly into the machine. Wilcoxon offers the ST101 spot
face tool for fast and easy surface preparation.
Tips:
»
Torque to specification to avoid inaccurate frequency
response, poor coupling and/or sensor damage
»
Avoid small debris between sensor and surface, as it can
dramatically reduce the upper frequency response limit
»
A thin coating of silicone grease can increase mounting
stiffness and enhance frequency response
Size
Mount
Mounting
torque
Description
SF1 short
mounting stud
10-32 UNF
both ends
30 in-lb
Stainless steel
0.26 in
SF3 mounting
adapter stud
10-32 to 1/4-28
threaded hole
20 in-lb
Stainless steel
0.315 in
SF3M mounting
adapter stud
10-32 to M8-1.25
threaded hole
20 in-lb
Stainless steel with
black oxide coating
0.315 in
SF20-1
stud
0.55 in
1/4-28 to 3/8-24
24 in-lb
Stainless steel
SF20-2
stud
0.75 in
3/8-24
50 in-lb
Stainless steel
SF20-M4
captive screw
0.85 in
M4
24 in-lb
For 712F and 997 sensors
SF20-M8
stud
0.72 in
3/8-24 to M8
24 in-lb
Black oxide coating
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Mounting studs
Size
Mount
Mounting torque
Description
SF6
mounting stud
0.375 in
1/4-28 both ends
24 in-lb
Stainless steel
SF6M
mounting stud
0.53 in
1/4-28 to M8
Stainless steel with black oxide
coating
24 in-lb
SF6M-1
mounting stud
0.39 in
1/4-28 to M6
Stainless steel with black oxide
coating
24 in-lb
SF7
mounting stud
0.83 in
3/8-16 thread both ends
Stainless steel, recommended
for ring mode accelerometers
30 in-lb
SF7B
adapter stud
1/4-28 internal to
3/8-16 external
24 in-lb
Threaded (helical) inserts
0.33 in
Cementing pads
Cementing pads should be used when the structure to be monitored cannot to be drilled. When installed properly, they provide high frequency capability approach-
ing stud mounts. They are often used in applications where multiple locations will be measured using a single sensor. Mounting pads can also be used when multiple
sensors are mounted for short periods of time, and directly epoxying the sensor is not practical.
Adhesive mounting provides a secure attachment and is the next best alternative to stud mounting. The sensor’s operational frequency range will be reduced
because the adhesive acts as a shock absorber, introducing a lower resonance than stud mounting. Replacement or removal of adhesive mounted sensors is more
difficult than other mounting methods. Avoid rubbery or sticky adhesives, and ensure that the adhesive layer is as thin and rigid as possible.
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