Activity that should be performed periodically on a banknoteA banknote (or ‘bill’ as it is often referred to in the US) is a type of negotiable promissory note, issued by a bank or other licensed authority, payable to the bearer on demand. More sortingProcess of fitness sorting of banknotes by their condition of use. Through this process, used banknotes are classified as fit or unfit to return into the circulation. See Processing of banknotes. More machine to review and update the correct operation of sensorsDevices capable of detecting specific physical properties of banknotes. More that identify and evaluate the banknotes in the automated sorting process (See Processing). The operator may make an ad hoc adjustment to the sensors, allowing for instructions to be given to the machine to be more or less rigorous in the selection process and therefore in the automatic destruction of banknotesA process by which a central bank destroys banknotes that are unfit to return into the fiduciary circulation. This is the last step in the life of the banknote. The destruction can be done manually or mechanically, and the latter may be online or offline. Online destruction is directly performed by automated sorting machines, without interruption of the treatment process. The process needs to be controlled in a very special way, since there is no possibility of verification or reconciliation. More.