what should be the distance of vibration sensor & to the point where vibra

what should be the distance of vibration sensor & to the
point where vibration to be measured Ex turbine axial
displacement

Question Posted / prakash h kusuma

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what should be the distance of vibration sensor & to the point where vibration to be measured ..

Answer / prakash

The philosophy is different for Axial and Radial
measurment. For radial measurement the AC component voltage
is directly proportional to the magniture of vibration so
the gap is fixed based on the probe linearity (usually
10vdc for bently nevada probes).
For axial measurement the AC component voltage is not
important and only the DC component is considered which
varies proportional to the distance between the probe and
the shaft. Conversely, the shaft is centered and the probe
voltage is adjujsted to 10Vdc and the same voltage is also
referenced in the system for shaft zero position. While the
unit/turbine is running the position of the shaft is
proportional to the dc component measured.

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what should be the distance of vibration sensor & to the point where vibration to be measured ..

Answer / sohail

50 mils

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what should be the distance of vibration sensor & to the point where vibration to be measured ..

Answer / deepak kumar behera

The distance of vibretion sensor and the piont where the
vibretion is to be measured is should be 1.5 mm.