Vibration Monitoring and Machine Protection Systems

Vibration Monitoring and Machine Protection Systems
Vibration Monitoring and Machine Protection Systems
1010 East Main Street, League City, TX 77573 Phone:281.334.0766 Fax: 281.334.4255
www.stiweb.com / www.stiwebstore.com
Condition Monitoring Custom Products
CMCP 1100
Accelerometer Mounting Instructions
When using any Piezoelectric sensor to measure vibration,
the sensor must directly contact the machine surface, and
the sensor should be mounted in a location that minimizes
the vibration transmission route through the machine.
Avoid mounting the sensor on thin material or vibration-free
areas. CMCP1100 Accelerometers are an ICP
Accelerometer and must be powered by 24 VDC through a
constant current diode (CCD). Powering directly with 24
VDC will destroy the unit and invalidate the warranty.
MOUNTING PAD INSTALLATION
Mounting pads eliminate drilling into the structure, and
provide high frequency capability comparable to stud
mounts. The CMCP 1100 should be mounted with CMCP
200-01 or CMCP200-02 Mounting Pads.
Once the pad is bonded to the surface with an appropriate
adhesive (CMCP 210 or CMCP 211), the accelerometer
screws into the threaded hole with a 1/4-28 stud (CMCP
230). The procedure below leaves the pad and the sensor
housing electrically isolated from ground.
Instructions:
Bore a slightly larger spot face than the diameter of the pad
to be installed on the machine housing. Do not use cutting
fluids as they may contaminate the bonding area.
Prepare epoxy according to manufactures specifications.
Apply a generous amount of epoxy to the spot face and
seat the mounting pad with a twisting motion.
THREADED STUD INSTALLATION
Stud mounting of the CMCP 1100 requires a hole to be
tapped directly into the structure. A threaded stud provides
the connection between the accelerometer and surface.
The junction must be a smooth flat surface with a
perpendicular tapped hole (within 1°) slightly larger than
the case of the accelerometer. For measurements above
1,000 Hz the surface should be smooth within 1 mil and
have a surface texture of a maximum of 32 micro inches.
The tap drill and spot face can be machined in one stop
with proper tooling such as the CMCP 701 Piloted Spot
Reamer.
Instructions:
Mount the drill into the CMCP 701 Spot Reamer with a
minimum of .35 inches drill extension. Drill and tap.
Apply a service removable threadlock such as Loctite 242
blue to the tapped hole in the sensor, and surface.
Build up the adhesive around the sides of the pad to
increase shear strength and assist electrical isolation. Do
not get epoxy in the sensor mounting surface. Let the
adhesive dry at least 24 hours.
Apply a service removable threadlock such as Loctite 242
blue to the tapped hole in the sensor.
Torque the sensor to 26 to 30 inch-pounds.
MOTOR FIN INSTALLATION
STI’s CMCP 205 series Motor Fin Mounts are a convenient
way to mount accelerometers to surfaces with cooling fins.
The mounts are made in several sizes to fit most
applications.
Instructions:
Thoroughly clean the surfaces of the fins where the mount
will be applied.
Make sure the tip of the fin mount contacts the case and
does not rest on the fins.
WIRING DIAGRAM
Prepare epoxy according to manufactures specifications.
Fill the surrounding area with epoxy, making sure the tip of
the motor fin mount is touching the surface, and not the
fins. Wait 24 hours for the epoxy to cure.
Apply a service removable threadlock such as Loctite 242
blue to the tapped hole in the sensor, and surface.
Install and torque CMCP 1100 to 26 to 30 inch-pounds.
Rev. 6/10
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