Hofmann EasyBalancer EB 3500 - Ranges of Typical Values for Zone Boundaries A;B, B;C and C;D

Evaluation - Overall value measurement EasyBalancer EB 3500
10 - 4
Evaluation of vibration ampli-
tudes as per ISO 20816
Evaluation of machine vibrations
 The basis of the following is the standard ISO 20816-1:2016 /
Mechanical vibration – Measurement and evaluation of ma-
chine vibration – Part 1: General guidelines.
 ISO 20816 recommends limits for different groups of ma-
chines
 Evaluation of the vibration cumulative value as the effective
value of the vibration velocity (in mm/s).
 Frequency range 10 to 1,000 Hz.
Guideline values (formerly ISO 10816)
Zone boundaries
Fig. 10-18: Ranges of typical values for zone boundaries A/B, B/C and C/D on
non-rotating components (as per [7])
 This table applies only to machines for which no special in-
ternational standards exist and for which no suitable empir-
ical values are available.
Small machines (e.g. electric motors with an output of up to
15 kW) tend to be at the lower end of a respective range
and large machines (e.g. engines on structures which are
elastic in the direction of measurement) tend to be at the
upper end of a respective range.
Class Definition
A to 0.17 / B to 1.8 mm/s
Small machines up to approx. 15 kW
especially electric motors
A to 1.8 / B to 4.5 mm/s
Larger engines and machines
on high foundations
A to 1.12 / B to 2.8 mm/s
Medium machines, 15 to 75 kW
without special foundations
A to 2.8 / B to 7.1 mm/s
Larger engines and machines
on deep foundations
A / B
B / C
C / D
1.8 ... 9.3
4.5 ... 14.7
0.71 ... 4.5