What is ‘x or y function’ and, ‘x and y function’ selection on a radial vibration monitor?

Instrumentation Vibration
1

X or Y function: in this mode, the unit shuts down when either ‘X’ or ‘Y’ probe detects a high vibration exceeding the set point.

X and Y function: in this mode, the unit shuts down only when ‘X’ and ‘Y’ probes detects a high vibration exceeding the set point.

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u mean if there are 2 sensors and any one having X or y function, and its vibration exceeds set limits then it will trip turbine.

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X and Y are proximitor sensor and the installation have a separation 90 or 60 degrees.

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thanks