This part of prEN ISO 15883 specifies particular requirements for washer disinfectors (WD) that are intended to be used for the cleaning and thermal disinfection, in a single operating cycle, of re-usable medical devices such as surgical instruments, anaesthetic equipment, hollowware, utensils and glassware. NOTE Thermal disinfection may be achieved by rinsing the load with hot water, exposure to steam or combination of the two. The requirements in this part apply in addition to the general requirements specified in prEN ISO 15883-1:2002.