Flame Supervision With Agq3.Xa27 And Flame Detector Qra; Figure 7: Connection Diagram Agq3.Xa27; Figure 8: Measurement Made At The Flame Detector Qra - Siemens LME39 Series Basic Documentation

Detector voltage at QRA... (with no load)
Terminal 3 off (refer to program sequence)
Terminal 3 on (refer to program sequence)
Detector voltage
Load by DC measuring instrument Ri >10 M
Terminal 3 off (refer to program sequence)
Terminal 3 on (refer to program sequence)
DC current detector signals with flame detector QRA...
Measurement at the flame detector QRA...
Ancillary unit AGQ3.xA27
Legend
Building Technologies Division
6.5 Flame supervision with AGQ3.xA27 and flame
detector QRA...
Only in connection with LME39.xxxx2 (AC 230 V)!
Mains voltage
Mains frequency
Perm. cable length from QRA... to
AGQ3.xA27 (lay separate cable)
Perm. cable length from AGQ3.xA27 to
LME39.xxxx2
Weight of AGQ3.xA27
Mounting position
Degree of protection
Power consumption
Table 4: Data QRA...
The correct functioning of aged UV cells can be checked with a UV test by applying a
higher voltage to the UV cell after controlled shutdown until terminal 3 carries voltage.
Connection diagram

Figure 7: Connection diagram AGQ3.xA27

C Electrolytic capacitor 100...470 µF; DC 10...25 V
Microammeter Ri max. 5,000 
M
QRA... Flame detector
GP Pressure switch
SB Safety limit thermostat
R
Control thermostat or pressurestat
W
Limit thermostat or pressure switch
Basic Documentation LME39...
6 Technical data
AC 230 V +10%/-15%
50...60 Hz 6%
Max. 20 m, unshielded
Max. 2 m, unshielded
Approx. 140 g
Optional
IP40, to be ensured through mounting
4.5 VA
At mains voltage UN
AC 220 V
DC 400 V
DC 300 V
DC 380 V
DC 280 V
Min. required
200 µA
Measuring circuit for measuring
the UV flame current
Figure 8: Measurement made at the
flame detector QRA...
bl Blue
br Brown
gr Grey
(old: rt = red)
sw Black
AC 240 V
DC 400 V
DC 300 V
DC 380 V
DC 280 V
Max. possible
500 µA
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CC1P7106en
08.12.2017