MANUAL: 55308
REV: A
ECO: 49582
6
permanent mounting, substitute epoxy or another type of
adhesive.
STEP 3:
Screw the mounting stud into the base of the
accelerometer and hand-tighten. Then, screw the
sensor/stud assembly into the prepared tapped hole and
tighten to the recommended mounting torque as indicated
on the
Installation Drawing
.
Note: 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.
3.4.2 ADHESIVE MOUNT
Adhesive mounting is often used for temporary
installation or when the test object surface cannot be
adequately prepared for stud mounting. Adhesives like
hot glue and wax work well for temporary mounts; two-
part epoxies and quick-bonding gels provide a more
permanent mount.
Note: Adhesively mounted sensors often exhibit a
reduction in high-frequency range. Generally, smooth
surfaces and stiff adhesives provide the best frequency
response.
METHOD 1 - Adhesive Mounting Base
This method involves attaching a base to the test
structure, then securing the sensor to the base. This
allows for easy removal of the accelerometer. Also, since
the bases are of a “hard-coated” aluminum design, they
provide electrical isolation to eliminate ground loops and
reduce electrical interference that may be present on the
surface of the test object.
STEP 1:
Prepare a smooth, flat mounting surface. A
minimum surface finish of 63
in (0.00016 mm)
generally works best.
STEP 2:
Stud-mount the sensor to the appropriate
adhesive mounting base according to the guidelines set
forth in
STEPS 2
and
3
of the Stud Mount Procedure.
STEP 3:
Place a small portion of adhesive on the
underside of the mounting base. Firmly press down on
the assembly to displace any extra adhesive remaining
under the base.
Figure 4.
Mounting Base: Adhesive Installation
METHOD 2 - Direct Adhesive Mount
For restrictions of space or for convenience, most sensors
(with the exception of integral stud models) can be
adhesive-mounted directly to the test structure.
STEP 1:
Prepare a smooth, flat mounting surface. A
minimum surface finish of 63
in (0.00016 mm)
generally works best.
STEP 2:
Place a small portion of adhesive on the
underside of the sensor. Firmly press down on the top of
the assembly to displace any adhesive. Be aware that
excessive amounts of adhesive can make sensor removal
difficult.
Figure 5.
Direct Adhesive Mounting
3.4.3 HANDHELD OR PROBE TIP MOUNT
This method is NOT recommended for most applications.
It is generally used only for machinery monitoring and
other portable trending applications. Both the accuracy
and repeatability at low (<5 Hz) and high frequency (>1
kHz) ranges are questionable.
3.5 Route Mineral Insulated
Hardline Cable
3.5.1 Care
Certain precautions should be used to avoid physical
damage and minimize electrical noise. For instance,
route the cables away from points that may exceed its
