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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
The fields of the SPM follow-up form for vibration
monitoring are listed in figure 9.
Field 4 contains the limit values for vibration classes II,
III, and IV. Cross out the columns which do not apply
to the machine in question.
If the form is to be used for machines class I, V or VI,
fill in the relevant vibration levels (see figure 10) in
field 8.
The graph in field 7 shows the value measured in the
direction which is most significant for changes in op-
erating condition. Note that the condition bands only
apply if the machine is classed correctly. The green
band covers both ”good” and ”acceptable” condi-
tion.
A follow-up form for copying is printed at the end of
this manual.
Measuring Intervals
There are no general rules about how often vibration
should be measured. The intervals between readings
– a day, a week, perhaps a whole month – depends
wholly on the individual machine, its work, its impor-
tance for the plant and on the rate of change in its
vibration level.
Obviously an exhaust fan with a soot problem will
need more frequent surveillance than a fresh air fan,
but only practical experience can help to determine
the optimal number of checks per month.
Follow-up Form for Vibration Readings
Fig. 9
Chart Modification
Limit values for machine classes I, V, VI
IVVI
11 71 110
7.1 45 71 bad condition
4.5 28 45
2.8 18 28 just tolerable
1.8 11 18
1.1 7.1 11 acceptable
0.7 4.5 7.1
0.5 2.8 4.5 good condition
0.3 1.8 2.8
Fig. 10
Fields on the Follow-up Form:
1 Machine name, number, and location
2 Machine sketch with numbered
measuring points
3 Notes
4 Vibration class and limit values
5 Date of measurement
6 Measured values in three directions
7 Plotted value of main direction
8 Space for other limit values in mm/s
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