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Greetings Mr .M NADEEM ANJUM .

You can monitor regular trend and analyze fault respective machine component frequencies  .

Typical acceleration data related to all types of bearings in general rotating equipment. (Exceptions = Diesel Engines & Rock Crushers.)

EXCELLENT LEVELS = Usually .10 G or Less. No action required.
GOOD LEVELS = Usually .35 G or Less. No action required unless noisy.
FAIR LEVELS = Usually .50 G or Less. No action required unless noisy.
(If you have no records consider vibration spectrum analysis for all levels below.)
ROUGH LEVELS = Usually .75 G or More. Possible action required if noisy. Also check bearing temperatures.
VERY ROUGH LEVELS = Usually 1.0 G or More. Further analysis required. Also check bearing noise and temperatures.
DANGER LEVELS = Usually 1.5 G or More. Problem likely. Further analyze and check bearing noise and temperatures.
BREAKDOWN LEVELS = Usually 2.5 G or More. Shutdown and fix now! Dangerous!
Note: Actual G = 32ft/sec/sec. = 9.8 m/s/s. Vibration equipment converts these values.

As mentioned if unusual noise is present either audible or using electronic stethoscope the acceleration G levels are secondary. This means there could be an early warning of a bearing defect at 1 G level.

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