Siemens LOA2 Series User Manual

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Flame supervision
Flame supervision with
Measuring circuits and length of the detector cables in accordance with Data Sheet
QRB...
N7714.
QRB... (typically)
Detector current
Permissible detector
Type of burner control
current during the
Possible detector
required during
prepurge time (dark
current in operation
operation
current)
(with flame)
(with flame)
(without flame)
LOA24.171B27 / LOA24.171B17
LOA25.173C27
Min. 70 µA
Max. 5.5 µA
Max. 210 µA
LOA26.171B27
LOA28.173A27
LOA24.173A27
Min. 45 µA
Max. 5.5 µA
Max. 45 µA
LOA36.171A27
Min. 70 µA
Max. 5.5 µA
Max. 900 µA
Data given in the above table only apply under the following conditions:
- Mains voltage depending on version AC 110 V or AC 220...240 V
- Ambient temperature 23 °C
Measuring circuit for
detector current
measurement
QRB...
11
12
LOA...
Legend
bl
sw
+
7118v01/0102
µA DC
DC microammeter with an internal resistance of
Ri = max. 5 k
µA DC
bl
Blue
sw
Black
br
Brown
QRB...
Only with LOA36... Detector current LED on Min. 60 µA ±15 %
Indication of flame
strength
12/16
Building Technologies Division CC1N7118en
19.05.2016

Siemens LOA2 Series Specifications

General

Brand	Siemens
Model	LOA2 Series
Category	Controller
Language	English