Seeking advice from experts! Bentley sensor issue!
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What is the difference between Bentley displacement sensors and vibration sensors? How can I determine whether the sensor is properly installed during replacement? ? The displacement sensor can measure a voltage of -10V; how can one determine the value for a vibration sensor? ? I have never been in contact with Bentley. . Please, experts, help me answer this!
Displacement and vibration sensors as well as preamplifiers are all universal; the difference lies in the software configuration. Radial vibration is measured in terms of peak-to-peak value, while axial displacement is measured in terms of voltage value.
Could you be more specific? How exactly should it be tested..
The vibration sensor can also detect -10 DC; when the shaft is at rest, a voltage of -8 to -10 VDC corresponds to a gap of approximately 55 mils. This is the position where the vibration probe should be installed. There is no protection at these voltage levels either, and the requirement for -10 VDC is mainly to ensure that the probe operates at the midpoint of its linear range.
Is it the same as a displacement sensor? ? ?
Vibration and displacement probes are actually the same; when installing a vibration sensor, with the rotor at rest, -10V can be used for installation. During displacement installation, it is necessary to have the equipment specialists determine whether the rotor is in the middle position or on the working surface or on the non-working surface. If it is in the middle position, it can be installed at -10VDC; in other positions, calculations based on the sensor model are required to determine the appropriate installation location for the displacement probe.
It’s quite complicated; it would be best to have a Betley manual to refer to.
When performing displacement installation, it is best to first have a fitter determine the maximum allowable displacement of the shaft, and then adjust the shaft to the middle position. Installation should be carried out based on the values displayed by the DCS. To measure displacement, simply check the voltage at the transmitter; for probes that have passed the calibration, the voltage value should be between -9 and -10 V