A method and apparatus for the delivery of slurry solution comprising an ultrasonic flow meter positioned between a fluid preparation manifold and a slurry delivery arm, and a shutoff valve positioned between a proportional valve and the slurry delivery arm. The circuit comprises an asynchronous clock group and one or more synchronous clock group. Further described are the use of Rayleigh wave surface acoustic wave devices for vapor phase detection as well as quartz crystal microbalance devices for liquid phase measurements. In the wireless data network, the mobility management activities for a mobile device are characterized by a mobility management finite state machine exercised in both the mobile device and network apparatus.