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D-LE 603 flame sensor
D-LE 703 flame sensor
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D-LE 603 flame sensor
D-LE 703 flame sensor

D-LE 603/703
Optical flame sensor

UV, VIS or IR flame sensor for combination with a control unit or automatic burner control. For optical monitoring of all fuel flames, including in complex multi-burner plants. 

D-LE 703 for application with


Functionality: Optical flame monitoring

  • Adjustable to different combustion technologies, e.g. flue gas recirculation
  • Flame sensor for every spectral flame monitoring range from UV to IR
  • Self-monitoring and fail-safe in conjunction with a control unit / burner control
  • Connection to the D-UG 120, D-UG 660 control units and D-GF 150(-MB) burner control
  • D-LE 603 and D-LE 703: Variants for direct view or for combination with fibre optic systems
  • Combined variant UV+IR with two detectors available
  • D-LE 703: For combination with D-LL 703 and D-LL 704 fibre optic systems
  • Easy access to the available settings reduces the time required for commissioning 
  • Selection of the available detectors allows the monitoring of flames of all fuels within the same device family
  • Device technology proven thousands of times over
  • Complex combustion plants including plants with many burners and different fuels
  • Combustion processes in continuous operation
  • Technical data
  • Explosion protection
Spectral sensitivityUV, VIS, IR, UV+IR
Operating modeIntermittent operation and continuous operation
Functional SafetySelf-monitoring and fail-safe in conjunction with a control unit or burner control, supports safety chains up to SIL 3
SettingMax.: Input filter LIN/LOG, 4 gains, 3 high pass filters
Opening angle 6° (D-LE 603)
Ambient conditions-20 … +60 °C
Degree of protectionWith cable gland (D-LE 603/703…-CG): IP65 With axial plug-in connector (D-LE 603/703…-P): IP67
ConnectionsD-LE 603:Sight tube G 1¼″; G 1″ (for /94Ex, /95Ex)Purge air G ½″; none (for /94Ex, /95Ex)
DimensionsHousing M2: 90 x 92 x 350 mm Housing M3: Ø 130 mm, length approx. 313 mm
WeightHousing (without cable):M2: approx. 1.8 kg M3: approx. 3.8 kg
D-LE 603 ../94ExII 2G Ex de IIC T5/T6
D-LE 603 ../95ExClass l, Div. 1, Group B, C & D
D-LE 603 ../96ExClass l, Div. 2, Group A, B, C & D
D-LE 603 ../97ExII 3G Ex nAnC IIC T6
D-LE 603 I../97ExII 3G Ex nA IIC T6
  • Mandatory
  • Recommended
  • Optional
D-LL 7xx (for D-LE 703)
D-ZS 033-I - Swivel mount for the alignment of the flame sensor
D-ZS 117-I - Thermal isolator with electrical insulation
D-ZS 133-I - Ball valve for closing the sighting tube
D-ZS 113 set - Set of orifice plates for insertion in purge air flange
D-ZS 118 - Optical adjustment aid for alignment of the swivel mount on the sighting tube
D-ZS 077-10 - UV-C test light source 230 V / 50 Hz
D-ZS 093 - UV-A, UV-B and IR test light source 230 V / 50 Hz
D-ZS 087-20 - Digital display for optimal alignment of flame sensors
D-ZS 140 - Terminal box for connecting flame sensor
D-ZS 141 - Terminal box for connecting flame sensor