BENTLY probe measurement issues
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Does the displacement probe show an increase in indication when it is brought closer, or when it is moved further away? Or does the positive indication change accordingly?
According to the curve, the output voltage increases as it moves away from the probe.
When installing our displacement device, we pushed the rotor of the unit into its operating state and adjusted the reading to 0 based on the displacement indication on the 3500 system. I wonder if you did it in the same way at that time? Moreover, before debugging, we need to push the thrust shaft to its farthest and nearest positions respectively to initially measure the maximum displacement.
I hope more people will get involved and discuss together! !
The voltage of the preamplifier decreases as it gets closer to the surface, and increases gradually to around 24V when it is further away.
Taking displacement as an example, we first identify the mechanical zero point and then adjust the distance; we use the value displayed on the indoor DCS as a reference, or voltage can also be used, with positive values indicating greater distance and negative values indicating shorter distance.
As the shaft moves closer to the displacement probe, the mounting voltage of the probe decreases; when it moves farther away from the probe, the mounting voltage increases. The host computer displays a negative value when close, and a positive value when far away
The output increases as one moves away from the probe, and decreases as one gets closer to it
The probe is an eddy current sensor; as the probe gets closer, the voltage value decreases. If it is a new installation, it needs to be tested using a TK-3E tester before installation. Generally, vibration measurements are taken at a distance. To measure displacement, the shaft is first pushed to one side. Measure the displacement, then adjust the distance before installing the probe. For general mechanical displacement, the midpoint is zero; values that are farther away are positive, while those that are closer are negative.