Siemens LOA26.171B27 User Manual

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Flame supervision
Flame supervision
with QRC...
Measuring circuits and length of the detector cables in accordance with Data Sheet
N7716.
QRC... (typically)
Type of burner control
Detector current
Permissible detector
Possible detector
required during
current during the
current in operation
operation
prepurge time (dark
(with flame)
(with flame)
current)
LOA24.171B17
Min. 70 µA
Max. 5,5 µA
Max. 90 µA
LOA24.171B27
Min. 70 µA
Max. 5,5 µA
Max. 110 µA
LOA24.173A27
Min. 45 µA
Max. 5,5 µA
Max. 45 µA
LOA25.173C27 ¹)
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---
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LOA26.171B27
Min. 70 µA
Max. 5,5 µA
Max. 110 µA
LOA28.173A27 ¹)
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LOA36.171A27
Min. 70 µA
Max. 5,5 µA
Max. 110 µA
¹) These types of LOA...
must not be used in connection with QRC blue-flame detectors...
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
QRC...
LOA...
detector current
11
12
1
Legend
br
measurement
bl
sw
+
7118v02/0102
µA DC
DC microammeter with an internal resistance of
µA DC
Ri = max. 5 k
bl
Blue
sw
Black
br
Brown
QRC1...
The QRC1 has been designed specifically for blue -burning flames. Incidence of light is
from the front and side. The clamp is secured with a soft plastic plug. 3-core connection
(preamplifier integrated in the detector casing). For the different types of flame
detectors, engineering notes and technical data, refer to Data Sheet N7716.
Only with LOA36... Detector current LED on Min. 40 µA ±15 %
Indication of flame
strength
11/16
Building Technologies Division
CC1N7118en
19.05.2016

Siemens LOA26.171B27 Specifications

General

Brand	Siemens
Model	LOA26.171B27
Category	Controller
Language	English