Extech Instruments 407850 User Manual page 6

Appendix: Machinery Classification
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When evaluating machinery and equipment it is useful to know their classification range
and group type. There are four machine groups and classification ranges recognized
internationally. The limits for vibration severity (mm/s) are shown in the Tables below:
GROUP K – Small Machinery up to 15KW (for example, production motors)
Testing Status
Good
Acceptable
Permissible
Dangerous
GROUP M – Medium-sized Machinery up to 75KW (for example, motors without
special foundations)
Testing Status
Good
Acceptable
Permissible
Dangerous
GROUP G – Large Machinery on Heavy Foundations
Testing Status
Good
Acceptable
Permissible
Dangerous
GROUP T – Large Turbo Machinery on Special Foundations
Testing Status
Good
Acceptable
Permissible
Dangerous
Vibration Severity (mm/s)
0 to 0.71
0.72 to 1.80
1.81 to 4.5
Greater than 4.5
Vibration Severity (mm/s)
0.00 to 1.12
1.13 to 2.80
2.81 to 7.10
Greater than 7.10
Vibration Severity (mm/s)
0.00 to 1.80
1.81 to 4.50
4.51 to 11.20
Greater than 11.20
Vibration Severity (mm/s)
0 to 2.80
2.81 to 7.10
7.11 to 18.00
Greater than 18.00
Model 407850 Version 1.2 December 2005
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