Help——Issues with the installation of the vibration and shaft displacement sensor probes on the Bentley 3300 shaft
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For the Bentley 3300 shaft vibration sensor, what changes occur in the voltage and current values as the sensor probe gets closer to the metal? (Do the voltage and current values increase or decrease simultaneously?) For the Bentley 3300 shaft displacement sensor, what changes occur in the voltage and current values as the sensor probe gets closer to the metal? (Do the voltage value and current value increase simultaneously or decrease simultaneously?)
The larger the gap, the higher the output voltage.
If your probe is compatible with the Bentley 3500 system, then the current signal is not useful; the monitoring signal is a voltage signal.
The probes for measuring vibration and displacement in the 3300 series are the same; the distance from the metal object simply affects the gap voltage. The farther the distance, the greater the negative value of the gap voltage. However, there are certain limits for this gap voltage, and measurements yield the best linear results when taken near the middle value of this range. Therefore, it is common to adjust the setting to around this middle value – for example, the gap voltage for an 8-millimeter probe is usually adjusted to around -9.8V. The change in displacement is directly the distance from the metal object; once the play of the axis is calculated and adjusted to an appropriate value, that’s sufficient. The vibration value is a high-frequency AC signal detected, which can be converted to a 4-20MA current value using a 3500 converter; its magnitude is related to the actual vibration condition