EDS RK 90 R Guía de usuario descargar pdf (Pagina 10)

EDS - RK90R - OPTICAL BEAM SMOKE DETECTOR - USER GUIDE

6 - OPERATION

6.1 - the RK90R detector is equipped with 2 circuits of detection of the smoke produced by a fire:

• Obscuration - circuit sensitive to obscuration.

This circuit bases its operation on the attenuation of the infrared beam intensity, along the optical path

between the transmitter and the receiver, caused by smoke presence.

• Turbulence - circuit sensitive to turbulence.

During the beginning phase of a fire, generally there are some clouds of smoke and warm air that rise

up to the ceiling.

When these clouds and warm air intercept the infrared beam produced by the detector, they cause a

perturbation of it, because they generate changes of optical and physics characteristics in the transmission

mean of the infrared beam.

This variations are obviously time related.

An suitable circuit has been designed to detect these variations and, when these reach the programmed

amplitude and the duration in time, an alarm signals is generated.

The sensitivity is independently adjustable to fully satisfy the specific application needs.

The advantage offered by this circuit is a great speed of fire detection, because it is detected in dynamic

way in its initial phase.

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EDS RK 90 R Guía de usuario Pagina 10