Blue-Flame Detectors Qrc - Siemens LMV37.4 Series Basic Documentation

Measuring circuit for
detector current
measurement
Building Technologies Division
Industry Sector

4.4.4 Blue-flame detectors QRC...

Check the intensity of flame with the AZL2...
For system-specific reasons, the display of maximum flame intensity by the AZL2... is
limited to approx. 55 %.
Caution!
Flame detectors QRC... are only suited for AC 230 V operation.
Threshold values when flame is supervised by QRC...:
- Start prevention (extraneous light)
- Operation
Required detector current (with flame)
Possible detector current (without flame)
Permissible detector current with flame
The values given in the table above only apply under the following conditions:
- Mains voltage AC 230 V
- Ambient temperature 23 °C
Start prevention (extraneous light) with
I
QRC
Operation with I
QRC
X10-05
3 4 5
LMV...
br
7541v12/1110
sw bl
+
µA DC
Basic documentation LMV37.4...
4 Technical Data
Intensity of flame (parameter 954) ≥10%
Intensity of flame (parameter 954) >16%
Min. 70 µA
Max. 5,5 µA
Max. 100 µA
Ca. 15 µA, display approx. 10 %
Ca. 25 µA, display approx. 16 %
Legend
µA DC DC-Mikroampèremeter an internal resistance of
Ri = max. 5 k
bl blue
sw black
br brown
31/235
CC1P7546en
20.09.2013