SPM leonova emerald - Vibration Severity Measurement

C:10 Measurement techniques always included
BC
Vibration severity measurement
Vibration severity measurement according to ISO 2372 is a broad band measurement over the
frequencyrange10to1000Hz.ItreturnstheRMSvalueofvibrationvelocityinmm/s(orinch/s).
This value is representative of the energy contents of machine vibration, and thus of the destructive
forces acting on the machine. It is still widely regarded as a good and easy to obtain indicator of
general machine condition.
Evaluation of machine condition
The evaluation consists of a comparison
of the measured value with the ISO limit
values recommended for 6 different
classes (see definition on the next page).
The majority of industrial machinery
belongs to the vibration classes 2, 3,
and 4:
Class2: Mediumsizemachineswithout
special foundations
Class3: Largemachinesonrigidfoun-
dations
Class4: Largemachinesonsoftfoun-
dations.
Forexample,mostsmallerprocesspumpsinachemicalplantwouldbeClass2.A100kWfanona
concretefoundationwouldbeClass3.However,thesamefanfastenedtothelessrigidmetaldeck
ofashipcouldbeconsideredasClass4.
Class1referstoindependentpartsofmachines,forexampleelectricmotorsupto15kW.Classes
5 and 6 are used for heavy reciprocating prime movers and machines which are intended to vibrate,
such as vibrating screens.
Leonova is programmed with the ISO limit values and will evaluate the measuring result, provided
the ISO machine class number is input under ‘Measuring point data’. On the instrument, the ISO
values for good and acceptable are shown as green. Just tolerable is yellow, unacceptable is red.