Feature Description - Dräger Flame 2000 Notice D'utilisation

en Description
2.2

Feature description

2.2.1 Dräger Flame 2000
The flame detector uses an advanced infrared (IR) sensor and optical
filter to provide maximum sensitivity to the CO
at 4.4 µm.
2.2.2 Dräger Flame 2500/2570
The flame detector uses improved IR sensor technology to provide
state-of-the-art fire protection. The flame detector uses patented
digital signal processing to analyze the spectral and dynamic
characteristics of the measured infrared radiation. The flame detector
features 3 IR sensors to identify fire events with exceptional sensitivity
and extreme immunity to false alarms. The flame detector further
includes an additional fourth IR sensor, sensitive to a different band
within the emission peak of hot CO
compared to those of the other 3. This increases sensitivity for some
types of flames (for example gas flames).
The Dräger Flame 2570 flame detector features a highspeed
response time of less than 50 milliseconds.
2.2.3 Dräger Flame 2700
The flame detector uses patented spectral analysis technology that
identifies the IR spectral signature of fire products, namely the hot CO
spectral emission band at 4.2-4.7 µm and the hot water (H
emission band at 2.7-3.0 µm. Additional spectral bands (above and
below these bands) are analyzed for background interferences.
The spectral analysis incorporates several detection algorithms,
according to several types of fire events, taking into account
simultaneous detection of both CO
them, as well as flickering analysis at frequencies typical to these
flames. Only when all the parameters of the spectral analysis and the
flickering analysis meet the predetermined values, is a fire condition
identified and the fire alarm is issued. When exposed to non-fire
6
emission spectral band
2
. The signal of this sensor is
2
O) spectral
2
and H O peaks, or only one of
2 2
radiation sources, these parameters do not identify a fire condition and
the detector does not react.
2.2.4 General
The flame detector includes a heated optical window. The heater
increases the temperature of the optical surface by 3-5 °C (5-8 °F)
above the ambient temperature to improve performance in icing, snow,
and condensation conditions.
The flame detector is available in 5 wiring options. The wiring options
are defined at the factory per customer order and cannot be changed
at the customer facility. For more information, please refer to
chapter 7.2 on page 20.
Both Dräger Flame 2500 and Dräger Flame 2700 offer different
sensitivity settings. For more information, please refer to chapter 7.4
on page 22.
Alarms are set as non-latching by default. However, the flame detector
includes a latched alarm output capability, which operates according to
the programmed function. Latching affects alarm relay, auxiliary relay,
0-20 mA output, and status LED. If selected, upon detection of a fire,
the detection signal is latched until a manual reset is performed (see
chapter 3.4.2 on page 17).
Detection performance can be easily adapted to all environments,
applications, and requirements by changing the configuration
parameters of the flame
2
communication (all models) or HART communication (in models with
0-20 mA output) can be used to change the configuration parameters
or perform monitoring or maintenance tasks. For more information on
communication, please refer to chapter 3.3.7 on page 13.
The detector is designed to withstand harsh environment conditions
(for example extreme temperatures, high humidity and vibrations).
detector. RS-485-based Modbus