Optical obscruation smoke monitor having a shunt flow path locat

Details Optical obscruation smoke monitor having a shunt flow path locat Optical obscruation smoke monitor having a shunt flow path locat

1994-02-28

1995-05-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356438, 340630, G01N 1506

Patent

active

054204402

ABSTRACT:
An obscuration type optical smoke monitor is provided for use particularly in dusty and dirty environments. The smoke monitor comprises a housing enclosing a smoke monitoring chamber; two access ports located opposite each other on the housing; a shunt air flow path located between said two access ports; means to conduct air from said access ports through an optical chamber; a light emitting diode at the first end of said optical chamber, which light emitting diode produces a light beam axially through the center of said optical chamber; a photo transistor at the second end of said optical chamber to receive the light bean and issue an electrical signal proportional to the received light intensity; and an electronic module which provides variable electronic output, generating an analog output essentially proportional of the optical obscuration caused by the smoke. Baffle means are provided to minimize extraneous light scattering from dust and dirt in the air,

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