D-LE 703

Flame sensor with optic system

D-LE 703 flame sensor (flame scanner) for use with


  • Self-monitoring and fail-safe flame sensor with a fibre-optic connection in conjunction with a control unit/burner control
  • Monitoring of gas, oil and coal flames
  • Connection to the D-UG 120, D-UG 660 control unit and the D-GF 150 burner control
  • Spectral range from UV to IR
  • Uniform output signal thus mutually interchangeable
  • Adjustable to different combustion technologies such as exhaust gas recirculation


  • Burners with difficult installation conditions for conventional flame sensors or on those whose environmental temperature near the sighting tube is too high
  • Power stations
  • Chemical industry
  • Refineries
  • Cement plants
  • Waste incinerators
  • Steam generators
  • Heating plants

Technical Data

Operation modeIntermittent operation, continuous operation and 72-hour operation without permanent supervision
SafetySelf-monitoring and fail-safe
Gainfour settings
High-pass filterthree settings
Spectral rangesUV, VIS, IR
Perm. ambient temperature-20…+60°C
Protectionwith cable gland (D-LE 703…-CG) IP65,
with axial plug (D-LE 703…-P) IP67
Dimensions90x92 mm, length approx. 270 mm
Weightapprox 1.2 kg


  • Digital display for measuring the pulse rate and its extreme values (D-ZS 087-20)
  • UV-A, UV-B and IR test light source 230 V/50 Hz (D-ZS 093)
  • Terminal box for connecting flame sensor (D-ZS 140)
  • Installation flange for D-LL 702 for fibre optic system (D-ZS 702)
  • Welding flange for D-LL 702 for fibre optic system (D-ZS 704)

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