BRUEL & KJAER VIBROCONTROL 8000 - 24.4.2 Air Gap; 24.4.3 Hydro Radial Vibration; 24.4.4 Hydro Velocity; 24.4.5 Low Frequency Acceleration

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24.4.2 Air Gap
Typical uses: Air Gap measurements on hydro turbine generators.
Measurement Description Default or Add
Minimum Air
Gap
The measured minimum Air Gap updated each revolution.
Default
Bias
DC sensor bias voltage for diagnostics.
Default
24.4.3 Hydro Radial Vibration
Typical uses: Hydro turbines or other low speed machines with proximity transducers. Maximum
speed 720 rpm.
Measurement Description Default or Add
Direct
Overall dynamic amplitude measurement.
84 dB /octave (14 pole) roll-on, -72 dB/octave (12 pole) roll-
off.
Default
Gap
DC sensor Gap or bias voltage for diagnostics.
Default
1X Amplitude
and phase
A synchronous amplitude measurement at running speed.
Default
Requires PT
2X Amplitude
and phase
A synchronous amplitude measurement at twice running
speed.
Default
Requires PT
24.4.4 Hydro Velocity
Typical uses: Hydro turbines or other low speed machines with velocity transducers. Maximum
speed 720 rpm.
Measurement
Description
Default or Add
Direct
Overall dynamic amplitude measurement.
84 dB /octave (14 pole) roll-on, -72 dB/octave (12 pole) roll-
off.
Default
Bias
DC sensor bias voltage for diagnostics.
Default
1X Amplitude
and phase
A synchronous amplitude measurement at running speed.
Default
Requires PT
2X Amplitude
and phase
A synchronous amplitude measurement at twice running
speed.
Default
Requires PT
24.4.5 Low Frequency Acceleration
Typical uses: Fans or other low speed machinery.
Measurement Description Default or Add
Direct
Overall dynamic amplitude measurement. Integrating
results in velocity. The Low Frequency acceleration
channel can be configured for integration as low as 1 Hz.
24 dB/octave (4 pole) filter roll-on, -24 dB/octave (4 pole)
roll-off.
Default
Bandpass
Addable bandpass measurement. Can be integrated to
provide integrated and non-integrated measurements
Add (if needed)
Bias
DC sensor bias voltage for diagnostics.
Default