User Manual

16/20
Smart Infrastructure CC1N7560en
3/4/2020
Technical data (continued)
Caution!
If QRA2 / QRA2M / QRA4 / QRA10-UV tubes are used for flame supervision on
the LMV6, it must be ensured that the LMV6 is permanently connected to power
(EN 298), thus enabling the LMV6 to detect flame detector failures during
startup and shutdown. The LMV6 generally operates with QRA flame detectors
in intermittent operation. For Technical data, refer to Data Sheet N7712, UV
flame detector QRA2 / QRA2M / QRA10! For Technical Data, refer to Data Sheet
N7711, UV flame detector QRA4!
Operating voltage in operation Max. 350 V peak
Possible detector current in operation Max. 80 µA
Permissible length of the standard
detector cable (laid separately)
Max. 10 m
Threshold values when flame is supervised by QRA
 Start prevention (extraneous light)
Flame intensity ≥ 18%
 Operation
Flame intensity > 25%
For more detailed information on QRA2 / QRA2M / QRA10, refer to Data Sheet N7712.
For more detailed information about QRA4, refer to data sheet N7711.
Legend
C Electrolytic capacitor 100 to 470 µF; 10 to 25 V DC
M
Micro-ammeter Ri max. 5000

Warning!
Simultaneous operation of the ionization probe and QRA2 / QRA2M / QRA4 /
QRA10 is not permitted. Failure to observe this information poses a risk of
damaging the safety functions.
Flame supervision with
QRA2 / QRA2M / QRA4 /
QRA10
Connection diagram
QRA2 / QRA2M / QRA4
/ QRA10
Measuring circuit for
detector current
measurement