Digital fire detection control panel
LYON
FIRE PROTECTION MANUFACTURER
Ctra. de Molins de Rei a Rubí, Km. 8,4 - 08191 RUBÍ (Barcelona) ESPAÑA.
Tlf.: +34 935 862 690 - Fax:+34 936 999 261 - [email protected] -
www.cofem.com
13
1.5.1.- Analogue sensors
1.5.1.1.- Analogue smoke sensors (A30XHA & A30XHA-S)
The analogue smoke sensors measure the smoke particle
concentration by unit of volume present in the atmosphere. If we
designate by Y an un-dimensioned parameter proportional to the
smoke concentration, then Y will have to be close to zero, and will
be growing as the atmosphere is contaminated.
The implemented dynamic processing algorithms in the
control panel, use the Y
alarm
value as level for setting off the Alarm.
This preset level is at:
Y
alarm
= 40
This level can be manually modified from the control panel.
When the concentration of smoke exceeds the
Alarm Level
(the average must exceed Y
alarm
) the alarm for the sensor is
activated.
Through the control panel, a level Y
dirty
(20) is set and when
this is exceeded the system warns us of the need to replace or repair
the sensor.
The Optical Smoke Sensor (
A30XHA
) is based on the
Tyndall effect created in an optical camera. The variation of the
electrical characteristics in the presence of combustion aerosols
makes it suitable as a smoke sensor.
The sensor element is formed by an optical camera provided
with an infrared emitter and receiver. In the absence of smoke the
intensity of infrared caught by the receiver is null, due to the
physical labyrinth created between the two. When smoke is present,
the infrared reflections from the particles of the same cause the
receiver to obtain a certain luminance intensity, (Voltage value proportional to the
level of obscuration), all of which is controlled by the microprocessor system.
This sensor has a thermistor, acting as a temperature sensor, triggering at 60ºC, considerably
augmenting its response to fire.
An optical smoke sensor without a thermal element is also available, with reference
A30XHA-S
.
The
A30XHA
and
A30XHA-S
are conformant with EN 54-7 with the conformity mark awarded by
AENOR.
The head and the base (interchangeable throughout the range of sensors) are made in thermal
resistant ABS.
The flashing of the red transparent LEDs indicates communication with the Control panel Lyon
system, and if they remain lit they indicate the alert status of the sensor.
Connection is made according to figure 2.
Technical specifications A30XHA and A30XHA-S
Supply
24 – 35 V any polarity
Standby consumption
1 mA
Alarm consumption
5 mA
Indicator activation
Double red LED
Remote indicator output
Yes
Humidity
20% – 95% RH
Temperature
-10º + 50ºC
Sensitivity
According to EN 54-7
IP IP40
Sensor A30XHA
Sensor A30XHAS
