Functional Principle; Operating And Alarm Signals - Gira 0869 00 Instructions De Montage Et Mode D'emploi

Functional principle

The smoke detector recognises fire early on due to the smoke deve-
lopment. It operates on the scattered-light principle. Light transmit-
ters and receivers are positioned in the measuring chamber so that the
emitted light signal of the transmitter cannot impact the receiver
GB
directly. If smoke enters the smoke chamber, the light signal is scatte-
red by the floating particles contained in the smoke. The scattered
light rays impact the photo cell where they are converted into electri-
cal signals which trigger the alarm. The function of the smoke evalu-
ation is checked constantly. Any faults are indicated by a fault signal
(signal sound and LED).

Operating and alarm signals

Signal sound
Loud intermittent
sound
Short signal sound at
45 sec. intervals
Short signal sound at
45 sec. intervals
-
Loud intermittent
sound
30
Light diode
Blinks
Blinks alternately to
the signal sound
Blinks parallel to the
signal sound
Blinks at 45 sec.
intervals
Blinks
Meaning
Local smoke alarm
Disturbance/soiling
Battery change display
Automatic self-test, normal
operating condition
Function test,
trigger by test button