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03/24999571
Hours of operation
The heat detector has an automatic pollution compensation with LED indicator and according to DIN 14675 A1 it is
subject to the following operation hours:
a) If, during the annual performance test according to DIN VDE 0833-1, no variance of the responding qualities is tested,
the detector can remain in service.
b) If according to point a) the functionality is demonstrated, the detector can remain operating up to eight years. After this
time the detector has to be replaced respectively has to be tested in the factory and to be overhauled.
Function / Application
The MSD 521 detects smouldering, glowing and open fires with smoke development at an early stage and is used
wherever smoke-developing flaming fires and smouldering fires are to be detected at an early stage.
Light emitter and light sensor are arranged in the sensing chamber in such a way that light from the emitter cannot strike
the sensor directly. Only the light scattered from smoke particles (Tyndall effect) reaches the sensor and is converted
into an electrical signal. If this reaches the alarm value, an alarm is automatically sent to the control panel.
The integral alarm indicator indicates the alarm locally. It is visible from any angle, regardless of the mounting.
Connection
The scattered light smoke detector MSD 532 is connected to control panels as conventional fire detector with current
increase. A 2-wire cable connects the control panel to the detectors in series.
Note
: active end module only at TRZ and TRZ VdS.
End of line resistor and active end module are not included in delivery.
Scattered light smoke detector MSD 523
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
+
+
+
4
5
7
8
10 11
1
2
19 18
10kΩ
10kΩ
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
+
+
+
19 18
Active end module
End of line resistor 10K
last detector
2nd detector
1st. detector
Connection
SHE group module RGM
(all Versions)
Compact control panel 4A and 8A
TRZ-Basic / TRZ Plus
Group module MZ2 GM
SHE system LON node 8A
TRZ 2A / TRZ VdS
Connection
