Flame Detectors; Technical Data; Measurement Circuits - Siemens LAE10 Quick Manual

Flame detectors

Technical data

Measurement circuits

Landis & Staefa Division
– UV detector QRA... (refer to data sheet 7712)
– Selenium photocell detectors RAR7 and RAR8 (refer to data sheet 7713)
– Flame rectification probe
Flame supervision by making use of the electrical conductivity of the flame in
conjunction with the rectifying effect is only possible with gas and blue-flame
burners.
Since the flame signal amplifier responds only to the d.c. component of the flame
signal (ionization current), a short-circuit across the detector electrodes cannot
simulate a flame signal.
CE conformity
According to the directives of the European Union
Electromagnetic compatibility EMC
89 / 336 EEC incl. 92 / 31 EEC
Directive for gas appliances
Low voltage directive
Environmental conditions
Transport
Climatic conditions
Temperature range
Humidity
Mechanical conditions
Operation
Climatic conditions
Temperature range
Humidity
Condensation, formation of ice and ingress
of water are not permitted!
Weight without plug-in base
Weight with normal plug-in base
Weight with high plug-in base
Flame supervision
Required min. detector current in µA
- At AC 100 V and AC 220 V
- At AC 110 V and AC 240 V
Max. possible detector current in µA
- At AC 100...110 V and AC 220...240 V
Perm. length of connecting cables
¹) In case of greater distances, use low-capacitance cable (total max. 2 nF), such as single-core RG62
²) Run detector cables separately, at least 5 cm away from other cables and, in case of greater distances, use
selenium photocell detector RAR8
LFE10
8 10
- +
FE
M
A Illumination of flame
C Electrolytic capacitor 100 µF, DC 10 V
FE Detector electrode
M Microammeter
QRA... UV detector
Ignition may affect the ionization current!
Remedy: exchange the connections on the primary side of the ignition transformer
CC1N7781E June 01, 1999
Mains voltageAC 220 V -15 %...AC 240 V +10 %
Mains frequency
90 / 396 EEC
73 / 23 EEC Prefuse (external)
Power consumption
IEC 721-3-2
class 2K2 Max. contact rating
-20...+60 °C
< 95 % r.h. Degree of protection
class 2M2
IEC 721-3-3
class 3K5
-20...+60 °C Mounting orientation
< 95 % r.h.
LAE10
305 g
380 g
415 g
LFE10
Rectification probe
min. 8
min. 9
approx. 100
20 m ¹)
LFE10
A
9 10
- +
M
C
-
+
+
QRA...
AC 100 V -15 %...AC 110 V +10 %
50...60 Hz ±6 %
max. 10 A (slow)
4.5 VA
IP 40
provided cable entry is in
compliance with IP 40
optional
LFE10
395 g
470 g
505 g
Series 02
LFE10 LAE10
UV detector Selenium cell
150 8
200 8
approx. 650 approx. 25
20 m ¹) 20 m ²)
LAE10
A
9 10
- +
M
-
+
7781a07/1198
2 A
3/8