Abstract: A fume hood optical sash sensing system for controlling the flow of air into a fume hood to maintain a constant face velocity by utilizing an optical sensing device mounted inside the fume hood that can sense the movement of a sash based on repeatable reflexive tape to produce an output control signal that corresponds to sash movement to produce desired airflow into the fume hood. The system includes an optical sensing device with a light source, reflexive tape with a repetitive, quadrature encoded pattern, a smart controller device that receives output control signals from the optical sensing device, and an actuation device capable of receiving the output signal from the controlling device to control the damper device that will result in constant face velocity across the face of the sash.

Abstract: Bi-directional communications via TCP (“Transmission Control Protocol”)/IP (“Internet Protocol”) between an HTML client program (i.e. “web browser”) and the linked or embedded HTML server (“Hypertext Markup Language”) of a Building Automation System (“BAS”) are used to provide an authorized user with access to the interactive graphical panels of the BAS allowing the user to, for instance, monitor, control, configure and interact with the BAS or multiple BAS's.

Abstract: Pulse width modulation of a high frequency series of AC current that is delivered to a lighting load(s) in “slices ” of current by a controller device that enables users to dim their loads while minimizing and/or virtually eliminating the externalities associated with current dimming systems.