23
Technical data
en
7.3
20 mA output signals
7.4
Detection sensitivity
7.4.1
Standard fire
Detection sensitivity is the maximum distance at which the flame
detector reliably detects a specific size of fire and typical type of fuel
(standard fire).
The flame detectors have different numbers of sensitivity levels:
Dräger Flame 2000: 2
Dräger Flame 2500/2570/2700: 4
The sensitivity levels refer to a standard fire. The standard fire is
defined as a 0.1 m
2
(1 ft
2
) n-heptane pan fire, with maximum wind
speed of 2 m/s (6.5 ft./sec).
For each sensitivity level there are 2 response levels:
Warning
Alarm
The detection distance at which a warning is issued is approximately
10% longer than the detection distance for an alarm.
For some typical ambient conditions, the Zeta parameter as defined in
NFPA 72 for the flame detector is 0.005 (1/meter).
Note
: Zeta parameters may vary significantly with changes in
temperature, air pressure, humidity, visibility conditions, and so on.
For information on the immunity to false alarm sources, please refer to
the Technical Manual.
Alarm response times of Dräger Flame 2000
Alarm response times for a standard fire are as follows:
Alarm response times of Dräger Flame 2500 and
Dräger Flame 2700
Alarm response times for a standard fire are as follows:
Detector status
Output
Fault
0 +1 mA
BIT fault
2 mA±10%
Normal
4 mA±10%
Warning
16 mA±10%
Alarm
20 mA±10%
Sensitivity level
Response time
in seconds
Detection distance
in meters (feet)
1: 5
3
5 (16.4)
2: 15 (default)
5
15 (50)
Sensitivity level
Response time
in seconds
Detection distance
in meters (feet)
1: 15
3
15 (50)
2: 30 (default)
5
30 (100)
3: 45
8
45 (150)
4: 65
10
65 (215)
