Setra Systems, Inc.

G Michael Soper

Sunil Barot

Justin DeSilva

Fran Nutter

An apparatus, having: a pressure differential sensor apparatus () configured to detect a pressure difference between two locations; a faceplate () having a base () and a protrusion () from the base, the protrusion comprising a light-transmissive perimeter () configured to transmit light forward and laterally; and a circuit board () having an indicator light () mounted thereon and configured to emit light into the light-transmissive perimeter, the indicator light further configured to emit a first color under first pressure difference conditions and a second color under second pressure difference conditions.

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Scarborough, MA, United States of America

G Michael Soper