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Technical data are subject to change without notice.
ISO 9001 certified. © Copyright SPM 1996-9. 71411.B
SPM Instrument AB • Box 4 • S-645 21 Strängnäs • Sweden
Tel +46 152 22500 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
Measuring Points, Examples
Fig. 15
Fig. 16
Fig. 17
The following two pages show measuring points and
possible adapter or transducer installations. How to
install measuring equipment is described in the SPM
installation manual.
Through Hole for Long Adapter
Figure 15 A shows how a measuring point beneath a
fan cover can be reached with a long adapter, through
a hole in the cover.
Adapter with Lock Nut
In figure 15 B, the fan cover is fastened directly to the
motor shield, which is also the bearing housing. One
of the cover's holding screws can be replaced by an
adapter with lock nut.
Bearing Housings Beneath Brackets
Consult machine drawings and identify the bearing
housing before selecting a measuring point.
In figure 16, showing a pump, the bearings are placed
in two separate housings inside the bearing bracket.
Measuring point 2, placed below and opposite to the
pump outlet (load direction!) can be reached with a
long adapter through an opening in the pump shield.
The bearing pair at measuring point 1 can be reached
with a long adapter through a clearance hole in the
bracket. The hole must be large enough to allow
bearing adjustment and still prevent metallic contact
between bracket and adapter.
Multiple Bearings in One Housing
If there are several bearings in the same housing, they
are normally treated as a single bearing. Figure 17
shows the bearing arrangement for a vertical pump.
It is not possible to distinguish between the shock
pulses from the paired bearings in point 1.
There is also a risk for cross talk between point 1 and
point 2, which means that the shock pulses from the
bearing in worst condition are picked up in both points.
Check signal strength with the probe. Use one meas-
uring point only if readings are identical in both points.
This point (x) can be placed halfway between points 1
and 2.
AB
1
2
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