evaluation of the vibration property amplitudes frequencies accelerations can be used to indicate when it is necessary to service or replace the bearing the present invention is described and illustrated in the context of a roller having a journal at its end as is often the case which is seated by way of the bearing arrangement however as an alternative the roller can be provided with an interior bore in both of its end areas into each of which a journal projects which is attached to the housing in this alternative the bearing would arranged between this journal and the cylindrical interior face of the bore the present invention provides a method and device for measuring or monitoring one or more process quantities or parameters associated with a roller journal bearing in a roller in a rolling mill train preferably through use of one or more appropriate sensors these process quantity s or parameter s are indicative of the functioning of the roller journal bearing or the operational dependability of the roller journal bearing the value of the measured or monitored process quantity can then be compared with a maximum or minimum threshold value stored in a memory as the marginal threshold value required for the orderly or proper operation of the bearing arrangement through comparison of the actual value and the nominal or threshold value it is possible to initiate a signal when a permissible tolerance range is exceeded thus providing the operator of the rolling mill train with a warning that maintenance or replacement work on the respective roller journal bearing or its surroundings is required it is to be understood from the illustration in fig2 that the method and device of the present invention for.