ADASH Ltd.
Adash 4900 – Vibrio M
Further technical and contact information can be found at www.adash.com
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Push the pad with glue to the prepared place and, while constantly pushing and turning the pad there
and back with circular movements, observe that the cement is being evenly pushed out along the
circumference of the pad. The purpose is to make the layer between the pad and the surface as thin
as possible.
! ATTENTION. CEMENT MUST NOT BE PUSHED OUT COMPLETELY!
Pushed out cement may be removed or levelled out around the pad. In the end you put a cover on the
pad.
When using the T pad, amount of the cement is dependent on the size of the gap between the motor
ribs and it is not so easy to determine amount of the cement to process. As with the simple pad, the
surface between the ribs must be well cleaned and degreased. The space shall be filled with the
necessary amount of the cement so that only the cylindrical part of the pad remains visible after drying
of the cement. In the end put the cover on the pad.
Listening to Vibrations Using Headphones
A user can connect headphones to the Adash 4900 – Vibrio M instrument, since listening to a
measurement signal also enables a differentiation of a problem type. People can think that this is an
old method, which does not have a place in this modern world. The opposite is true. Analysis of gears
and low speed bearings (e.g. in paper mills) gain better quality by using the listening method. The
listening can easily be done by any maintenance person without deeper knowledge of diagnostics. If
there is a defective bearing, distinct rumbling sound is audible in the headphones then. If the bearing
is OK, then you can hear only a weak noise.
HEADPHONES WARNING !
Listen at moderate volumes to avoid hearing damage.
Always remove the headphones from the ears when you move the sensor or re-connect cable.
Relationship of Measuring in Acceleration and Speed
Maintenance staff usually measure vibrations in mm/s or inch/s (velocity) only and not vibrations in
g = 9.81 m/s
2
(acceleration). This is a relic of the past, when old equipment enabled the vibration
speed measurement only. Bearing defects are not recognizable by using velocity measurements. If the
velocity value increases due to a bearing defect, then the defect is already serious and there is an
acute danger of unexpected breakdown. The measuring of the velocity vibration does not give early
enough warning before failure of a rolling bearing.
For accurate bearing condition measurement you have to measure the acceleration vibration!
Abbreviations used in the guide
Abbreviations below are used in the User’s guide
RPM
– Revolutions per minute
CPS
– Revolutions per second
RMS
– RMS value of the measured signal
PEAK – Peak value of the measured signal
