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Flame sensor D-LE 701

D-LE 701
Optical flame sensor

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

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
  • For combination with D-LL 701 and D-LL 702 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
  • Combustion processes with very high temperatures at the burner plate
  • Combustion processes with very strong vibrations at the burner plate
  • Technical data
Spectral sensitivityUV, VIS, 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
Ambient conditions-20 … +60 °C
Degree of protectionWith cable gland (D-LE 701…-CG): IP65 With axial plug-in connector (D-LE 701…-P): IP67
Dimensions160 x 185 x 100 mm
WeightHousing (without cable) approx. 1.2 kg
  • Mandatory
  • Optional
D-LL 7xx
D-ZS 093 - UV-A, UV-B and IR test light source 230 V/50 Hz
D-ZS 087-20 - Digital display for measuring the pulse rate and its extreme values
D-ZS 140 - Terminal box for connecting flame sensor