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Building Technologies Division Basic documentation LMV36... CC1P7544en
Infrastructure & Citiies Sector 4 Technical data 25.09.2013
4.4.2 UV flame detectors QRA2 / QRA4 / QRA10
Caution!
If flame detectors QRA2 / QRA4 / QRA10 are used for flame supervision with the
LMV36..., 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. Generally, the system
works with QRA flame detectors in intermittent operation.
For technical data, refer to Data Sheet N7712 covering QRA2 / QRA10 UV flame
detector!
For technical data, refer to Data Sheet N7711 covering QRA4 UV flame detector!
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
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%
UV flame detector QRA...
QRA...
Legend
A Incidence of light
C Electrolytic capacitor 100...470 µF; DC 10...25 V
M Microammeter Ri max. 5000
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!
Measuring circuit for
detector current
measurement
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