Blue-Flame Detectors Qrc - Siemens LMV27.100x2 Basic Documentation

Measuring circuit for
detector current
measurement
Building Technologies

4.4.5 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.
Start prevention (extraneous light) with
I
QRC
Operation with I
QRC
Required detector current
(with flame)
QRC Min. 70 µA
The values given in the table above only apply under the following conditions:
- Mains voltage AC 230 V
- Ambient temperature 23 °C
X10-05
3 4 5
br 7541v12/1110
sw bl
+
µA DC
Figure 9: Measuring circuit QRC
Basic Documentation LMV27...
4 Technical Data
Ca. 15 µA, display approx. 10 %
Intensity of flame (parameter 954)
Ca. 25 µA, display approx. 16 %
Intensity of flame (parameter 954)
Permissible detector current
(without flame)
Max. 5,5 µA
LMV...
Legend
µA DC DC-Mikroampèremeter an internal resistance of
Ri = max. 5 k
bl blue
sw black
br brown
Typical detector current
(with flame)
100 µA
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CC1P7541en
17.12.2018