Technical data are subject to change without notice.
© Copyright SPM 2002-04. 71650.B
SPM Instrument AB • Box 504 • S-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
Shock pulse transducer with probe
All three types of shock pulse transducers are connected to the TNC connector marked SPM. The
choice of transducer type depends on how the measuring point is prepared. For systematic shock
pulse monitoring, SPM recommends the use of installed adapters and quick connect transducer
wherever possible.
Measuring points for the hand-held probe should be clearly marked. Always measure in the same
spot. In addition, the probe is used to measure elsewhere on the machine, in case it is necessary to
search for other shock pulse sources such as pump cavitation or rubbing parts.
The probe tip is spring loaded and moves within a sleeve of hard rubber. To maintain a steady
pressure on the tip, press the probe tip against the measuring point until the rubber sleeve is in
contact with the surface.
Hold the probe steady to avoid rubbing between probe tip and surface.
The probe is directionally sensitive. It has to be pointed straight at the bearing.
The centre of the probe tip should touch the surface. Avoid pressing the probe tip against cavities
and fillets which are smaller than the probe tip.
The only part likely to wear out is the rubber sleeve for the probe tip. It is made of chloroprene
rubber (neoprene) and tolerates 110° C (230° F). Spare sleeves have the part number 13108.
Transducer with probe
Rubber sleeve
in contact with
the surface
Point at the
bearing
Hold steady
Avoid small
cavities and
fillets
SPM 13108
Neoprene, 110° C (230° F)
SPM measuring points and transducers 13
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