Apollo Smoke Detector XP95 Guía de usuario descargar pdf (Pagina 10)

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The IR LED emits a burst of

collimated light every

second. In clear air the

photo-diode receives no

light directly from the IR

LED, because of the angular

arrangement and the

chamber baffles. When

smoke enters the chamber it

scatters light from the

emitter IR LED onto the

photo-diode in an amount

related to the smoke

characteristics and density.

The photo-diode signal is

processed to provide an

analogue value for

transmission when the

detector is interrogated.

DISCOVERY OPTICAL SMOKE DETECTOR

Discovery Optical Smoke Detector ▲ Part Number 58000-600

OPERATING

PRINCIPLES

The Discovery optical

detector uses the same outer

case as the ionisation smoke

detector and is distinguished

by the indicator LEDs which

are clear when the detector

is in quiescent state and red

in alarm. Within the case is

a printed circuit board

which, on one side, has the

light-proof chamber with

Fig.3 Top section - Discovery Optical Smoke Detector

Mode Alarm threshold Minimum

%/m time to alarm

(sec)

1 1.4 5

2 1.4 30

3 2.1 5

4 2.1 30

5 2.8 5

Compensation rate complies with EN54–7:2000

Table 2 Optical detector operating modes

Optical Chamber

Address Buttons

PCB Cover

Photo-Diode

Case Moulding

Infra-Red LED

integral gauze surrounding

the optical measuring

system and, on the other,

the signal processing and

communications electronics.

An infra-red light emitting

diode within its collimator

is arranged at an obtuse

angle to the photo-diode.

The photo-diode has an

integral daylight-blocking

filter (Fig.3).

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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