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LSN Peripherals | LSN Smoke | 327
MAGIC.SENS Automatic
LSN Fire Detectors
Features
▶
Detector properties adapted to cater for room usage
▶
Active adjustment of the threshold (drift
compensation)
▶
Self-monitoring sensor technology with fault indication
on the fire panel in the event of sensor failure or heavy
soiling
▶
Preservation of LSN loop functions in the event of wire
interruption or short-circuit of a detector through
integrated isolators
▶
Robust and durable
MAGIC.SENS Fire Detectors set new standards in fire
detection technology through a combination of optical,
thermal and chemical (gas) sensors and intelligent
evaluation electronics. Their most impressive feature is
their ability to prevent false alarms, as well as speed and
accuracy of detection.
System Overview
Operating
mode
Detector type
OTC OC OT O T
Combined x x x - -
Optical x x x x -
Thermo-max. x - x - x
Thermal differ-
ential
x - x - x
Chemical x x - - -
Functions
Sensor technology and signal processing
The individual sensors can be configured via the LSN
network manually or using a timer.
All sensor signals are analyzed continually by the internal
evaluation electronics and are linked with each other. The
link between the sensors means that the combined
detectors can also be used where light smoke, steam or
dust must be expected during the course of normal
operation.
Only if the signal combination corresponds to that for the
programming of the selected usage site field code will the
alarm be triggered automatically. This results in a higher
level of security against false alarms.
In addition, the time curve for fire and malfunction
detection sensor signals is also analyzed, resulting in
increased reliability of detection for each individual sensor.
Optical sensor (smoke sensor)
The optical sensor uses the scattered-light method.
An LED transmits light to the measuring chamber, where it
is absorbed by the labyrinth structure. In the event of a fire,
smoke enters the measuring chamber and the smoke
particles scatter the light from the LED. The amount of light
hitting the photo diode is converted into a proportional
electrical signal.
Thermal sensor (temperature sensor)
A thermistor in a resistance network is used as a thermal
sensor, from which an analog-digital converter measures
the temperature-dependent voltage at regular intervals.
Depending on the specified detector class, the temperature
sensor triggers the alarm status when the maximum
temperature of 54 °C or 69 °C is exceeded (thermal
maximum), or if the temperature rises by a defined amount
within a specified time (thermal differential).
Chemical sensor (CO gas sensor)
The main function of the gas sensor is to detect carbon
monoxide (CO) generated as a result of a fire, but it will also
detect hydrogen (H) and nitrous monoxide (NO). The
sensor signal value is proportional to the concentration of
gas. The gas sensor delivers additional information to
effectively suppress deceptive values.
Depending on the service life of the gas sensor, the OTC 410
and the OC 410 detectors switch off the C sensors after five
years of operation. The detectors will continue to function
as an OT or O detector. The detector should then be
exchanged immediately in order to be able to keep using
the higher reliability of detection of the OTC or OC detector.
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