Structure and function
Setup
3
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Building Technologies
A6V10305793_m_en_--
Fire Safety
2016-02-15
Fire detection
The point detector's high-quality opto-electronic measuring chamber houses the
following components:
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Two optical transmitters
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One optical receiver
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Two thermal sensors
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One CO sensor
The transmitters illuminate the smoke particles from different angles. One sensor
acts as forward scatterer, the other as backward scatterer. The scattered light then
hits the receiver (photodiode) and generates a measurable electric signal.
The combination of forward scatterers and backward scatterers allows for optimum
detection of and distinction between light and dark particles and particle sizes. The
distinction between light and dark particles firstly results in a homogeneous
response behavior and secondly enables better differentiation between wanted
signals and deceptive phenomena.
In addition, the heat sensors make it possible to detect fires without smoke
generation.
The CO sensor enables faster detection of fires with incomplete combustion and
fires with the development of a lot of CO.
The combination of optical, thermal and CO sensor signals optimizes detection
reliability for all types of fire, regardless of whether they generate dark or light
smoke, or none at all.
You can set the following response behaviors on the neural fire detector
OOHC740:
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Combined optical and thermal
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Combined optical, thermal and CO
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Optical smoke detector alone
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Heat detector alone
The response behavior is determined by selecting one of the following sensor
modes:
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Sensor mode 0: Application as neural fire detector
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Sensor mode 1: Application as heat detector
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Sensor mode 2: Application as smoke detector
The sensor mode is configured with the 'Cerberus-Engineering-Tool' software.
NOTICE
Functionality of sensor modes
Danger of alarm activation as a result of deceptive phenomena
●
Depending on the configuration software used for the fire control panel,
sensor modes 1 and 2 may not be available.
If the deceptive phenomena occurring (e.g. if the operator suspects that both
CO and smoke-like deceptive phenomena are present at the same time)
mean that only one heat detector can be operated, the OOHC740 may not be
used in such environments.
Combined optical-thermal or optical-thermal CO mode is selected by choosing the
parameter set in sensor mode 0!
The parameter sets of the heat detector or optical detector can be selected in
sensor mode 1 or 2.
