for different parameter settings alternatively or additionally the computer system 17 may control the alerting means 17 c to alert an operator of the milking arrangement in response to the item batch model and or manufacturing date of the exchangeable expendable part 12 b 13 a b yet alternatively or yet additionally the computer system 17 may simply store and make the item batch model and or the manufacturing date of the exchangeable expendable part 12 b 13 a b available to an operator of the computer system 17 in one embodiment the computer system 17 is arranged to store information regarding a desired model of the exchangeable expendable part 12 b 13 a b in its memory 17 b check whether the model of the exchangeable expendable part 12 b 13 a b corresponds to the desired model and if the model of the exchangeable expendable part 12 b 13 a b does not correspond to the desired model control the alerting means 17 c to alert an operator of the milking arrangement that the model of the exchangeable expendable part 12 b 13 a b does not correspond to the desired model in another embodiment the computer system 17 is arranged to store information regarding a desired model of the exchangeable expendable part 12 b 13 a b in its memory 17 b check whether the model of the exchangeable expendable part 12 b 13 a b corresponds to the desired model and if the model of the exchangeable expendable part 12 b 13 a b does not correspond to the desired model stop the milking equipment 11 from being used until the exchangeable expendable part 12 b 13 a b has been exchanged for an exchangeable expendable part of the desired model further in one.