Siemens Industry, Inc.

Siemens Building Technologies, Inc.

Keith McIlhany

Robert L Kalafut

John Biedron

Systems and methods for determining the area of a sash opening in a fume hood formed by at least one movable sash panel. An emitter and sensor panel is mounted in a fume hood enclosure space. The emitter and sensor panel comprises at least one light emitter mounted on one side of an optical sensor. The at least one light emitter is configured to illuminate the fume hood enclosure space. At least one reflective marker is mounted on one edge of the sash opening to reflect light from the at least one light emitter. Optical information detected at the optical sensor is used to determine a variable distance to the at least one reflective marker. The variable distance and known distance parameters are used to determine the area of the sash opening.

Sash position sensor

A building control system, such as an HVAC system, has a field unit incorporating a control panel (a field panel) with a local user interface allowing user changes and/or modifications (events) to be made at the field panel to various objects or control points of the field panel, such as the point database, control programs, configurations and other data. A log of the changes made at the control panel is maintained, compiled and/or stored locally (i.e. at the field control panel level). The local log maintains the changes as events. The local log identifies data regarding the change itself, who made the change and when the change was made (identification data). The local log can be viewed locally or uploaded to a workstation where it can be stored, viewed and combined with a system wide log.

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Antioch, IL, United States of America

Keith McIlhany