FIELD: physics, measurement.
SUBSTANCE: invention is related to the field of metering equipment and may be used to monitor rotation frequency of turbine impeller. In device according to invention, two parallel subdevices are provided, which have three signal inputs to obtain redundant registration of two out of three signals of rotation frequency. Every subdevice comprises calculating unit used to calculate rotation frequency of machine rotating part. Besides every subdevice has signal input for generation of rotation frequency calculated by appropriate computing unit. Corresponding signal inputs of subdevices are loaded parallel to output signals of rotation frequency detector. In case of error device function, according to invention, may fully be taken by one of subdevices so that both erroneous output signal of rotation frequency detector and failure of one subdevice are permitted.
EFFECT: higher reliability of control.
23 cl, 2 dwg
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