40
Bentone
General
Warning!
!
+
-
+
-
A
QRA
M
C
LMV
X10-06.2
X10-06.1
!
If flame detectors QRA2… / QRA4.U / QRA10... are used for
flame supervision with the LMV37.4..., it must be ensured that the
basic unit is permanently connected to power (conforming to EN
230 / EN 298), thus enabling the system to detect flame detector
failures during startup and shutdown.
Operating voltage Max. 350 V peak
Required detector current in
operation
Min. 70 µA
Possible detector current in
operation
Max. 600 µA
Permissible length of flame
detector cable
- normal cable (laid separately)
Max. 20 m
UV flame detector QRA...Measuring circuit for detector
current measurement
Legend
A Incidence of light
C Electrolytic capacitor 100...470 µF;
DC 10...25 V
M Microammeter Ri max. 5000
!
• 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!
Threshold values when flame is supervised by QRA...:
- Start prevention (extraneous light) Intensity of flame (parameter 954) ≥18%
- Operation Intensity of flame (parameter 954) >24%
6.10 UV detector
This should not be exposed to temperatures higher than 60°C. The current
passing though the UV detector, when it is lit up, should be at least 70 µA for
LFL1. This current can be measured using a multimeter, although this is only
necessary if a malfunction is suspected.
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