The purpose of the machine condition monitoring system shall be desired to accept a variety of transducer inputs and continuously monitor and display appropriate machinery parameters alarms are generated.
When the conditions exceed user established limits. These alarms are used to automatically shutdown the machine or to annunciate machinery problems to operators and other plant personals.
In such a machinery monitor conditioning system one of the essential parameters is vibration.
In general, we use the Bently Nevada 3500 machine monitoring system.
To find out vibration, following things are required
Vibration measurement units are mills.
It is on the SI unit of length equal to one million of a meter, or equivalently one thousand of a millimeter.
It is also commonly known as a micron. It can be written in scientific notation as 1*10-6 m , measuring 1/10,00,000 mill-unit of length or displacement equal to 0.001 inches or 25.4 micrometers.
Specially a proximity probe transducer sometimes used to describe any transducers.
The physical distance between the face of a proximity probe to tip and the observed surface the distance can be expressed in terms of displacement (mills, micrometer) or in terms of voltage (millivolts) standard polarities convention dictates that a decreasing gap result is increasingly less negative output signals.
Direct vibration amplitude, probe gap, and other vibration amplitude and phase information proportional values are mentioned below.
Note: If the reading is below -9.5 V then the probe must be slacked (anticlockwise). If the voltage is above -10 V then probe must be tightened (clockwise). When the correct voltage is obtained tightened the bollon lock nut. Refit vibration probe cover.
If a reading of zero or over 10 ohms is obtained then the cable is faulty and should be replaced.
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