I’m no expert in vibration analysis of turbines, but here is my 2c:
Relying on raw data transferred via comms protocols like OPC will always provide you a data resolution limited by the speed of your connection.
It may be worth considering a purpose built condition monitoring sensor such as Balluff BCM0002 which pre-processes the data at the hardware layer before transmitting it to SCADA, these sensors can be configured to record RMS data, but also Peak-Peak, standard deviation, min, max values that way you will not miss any spikes or other strange events and you can control the amount of data stored in SCADA based on your sample rate.
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