A method and system for generating electronic data summary based on context and semantics of the document and its subsequent usage is disclosed. Thus, the cause of a problem may be identified by comparing a trace of events preceding occurrence of the problem with previously diagnosed traces. The syringe has an elongate hub having a passageway therethrough, a distally extending stem, and a proximal flange with an engagement for engaging said barrel. PI controller settings are given as a function of the dead timetime constant ratio. The signal processor module is configured for converting an optical distance difference into a phase difference and processing the optical distance difference to obtain a linear signal. By introducing an additive that allows the metal nitride to self passivate, the heater element forms a surface oxide layer, where the oxide has a low diffusion coefficient for oxygen so as to provide a barrier to further oxidation.