beta sensorik Hansford Sensors HS-620, Operating Manual, Page: 8 / 22

HS-620/630 User Guide
- 6 –
QM14 Issue 4
2.4 Overall Vibration Measurement & Assessment
At switch-on the meter defaults to the Velocity measurement mode, with
the units ‘mm/s rms’ indicated at the bottom right of the display.
If required, press
SEL to select acceleration or displacement. Note that
no vibration assessment is available on these ranges.
When the vibration reading has settled, press
VIB to move to the Hold
mode. An ‘ H ’ icon is displayed.
In the velocity range the meter will then indicate either a tick icon for OK ,
a single bell for vibration alert or two bells for danger.
The meter makes this assessment depending on the vibration level and
one of the four machine group options selected using the
SEL key.
The machine groups are defined in ISO10816-3 and the meter
categorises these as ’ISO1&3-R’, ‘ISO1&3-F’, ‘ISO2&4-R’, ‘ISO2&4-F’.
R and F refer to rigid and flexible machine mounting respectively.
A label on the back of the meter gives details of the ISO10816-3
machine groups. The user can refer to this to confirm the appropriate
group number for the tested machine. The information contained is as
follows in section 2.5.
2.5 ISO Machine Groups:
Group 1 – Large machines rated power above 300KW; Electrical
machines with shaft dia. >315mm. Normally sleeve bearings, speed
120RPM - 15000RPM.
Group 2 – Medium size machines rated power 15KW < P 300KW;
Electrical machines with shaft 160mm <dia.>315mm. Normally element
bearings, Speed above 600RPM.
Group 3 – Pumps with multi-vane impeller and with separate driver
(centrifugal, mixed flow or axial flow) with rated power above 15KW.
Group 4 – Pumps with multi-vane impeller and with integrated driver
(centrifugal, mixed flow or axial flow) with rated power above 15KW.
Support Class
: R = Rigid Mount: F = Flexible Mount.