Calculating a temporal filter values to filter video data for noise and ghosting artifacts. The protuberances can be arranged in diametrically opposed pairs with longitudinally adjacent pairs having different radial directions first to cope with fluid flow from a variety of different directions. This set is then stored instead of the raw event ID and used for all subsequent analyses of the events. A capacitive load is connected to the output of the passive mixer. The event manager is operative to employ the rule-based application and predictive application to identify business events according to the stored business process policies.