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Technical Data (cont´d)
Flame supervision with
QRA2 / QRA4 / QRA10
Measuring circuit for
detector current
measurement
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Warning!
If UV flame detectors QRA2 / QRA4 / QRA10 are used for flame supervision with
the LMV36, it must be ensured that the LMV36 is permanently connected to
power (conforming to DIN EN 298), thus enabling the LMV36 to detect flame
detector failures during startup and shutdown. Generally, the system works
with QRA flame detectors in intermittent operation. Technical Data refer to
Data Sheet N7712 covering UV flame detectors QRA2 / QRA10! Technical Data
refer to Data Sheet N7711 covering UV flame detectors QRA4!
Operating voltage
Required detector current in operation
Possible detector current in operation
Permissible length of flame detector
cable, normal cable (laid separately)
Threshold values when flame is supervised by QRA:
- Start prevention (extraneous light)
- Operation
UV flame detector QRA
QRA...
Legend
A
Incidence of light
C
Electrolytic capacitor 100...470 µF; DC 10...25 V
Microammeter Ri max. 5000
M
Warning!
Input QRA... is not short-circuit-proof!
Short-circuits of X10-06 pin 2 against earth can destroy the QRA input
Simultaneous operation of QRA and ionization probe is not permitted!
Max. 350 V peak
Min. 30 µA
When the more sensitive flame
supervision is activated, the required
detector current is halved (refer to chapter
Flame detection sensitivity in the Basic
Documentation P7544).
Max. 600 µA
Max. 6 m
Flame intensity (parameter 954) ≥18 %
Flame intensity (parameter 954) >24 %
23/30
CC1N7544en
21.05.2021
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