D-LE 603

Flame sensor

Flame sensor (flame scanner) for the monitoring of gas, oil and coal flames, primarily in multi-burner view applications.


  • Self-monitoring and fail-safe in conjunction with a control unit/burner control
  • Flame sensors for every spectral range from UV to IR
  • Connection to the D-UG 120 control unit, D-UG 660 control unit as well as to the D-GF 150 burner control
  • Uniform output signal thus mutually interchangeable
  • Adjustable to different combustion technologies such as exhaust gas recirculation
  • Compliance to general safety regulations


Technical Data

Operational modeIntermittent operation, continuous operation and 72-hour operation without permanent supervision
SafetySelf-monitoring and fail-safe in conjunction with a control unit / burner control
Gainfour settings
High-pass filterthree settings
Spectral rangesUV, VIS, IR
Viewing angle
Perm. ambient temperature-20…+60°C
Sighting tube connectionG 1¼" or 1¼" NPT(F)
Purge air connectionG ½" or ½" NPT(F)
Protection classwith cable gland (D-LE 603…-CG) IP65,
with axial plug (D-LE 603…-P) IP67
Dimensions90x92 mm, length approx. 350 mm
Weightapprox 1.8 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
II 3G Ex nA IIC T6 for D-LE 603 I...
Sighting tube connectionG 1“ (/94Ex, /95Ex)
G 1¼" (/96Ex, /97Ex)
Protection classIP65
Dimensionsdiameter 130 mm,
length approx. 313 mm
Weightapprox. 4.3 kg


  • Digital display for optimal alignment of flame sensors (D-ZS 087-20)
  • Set of orifice plates for insertion in purge air flange (D-ZS 113 Set)
  • Optical adjustment aid for alignment of the swivel mount on the sighting tube (D-ZS 118)
  • UV-C test light source 230 V / 50 Hz (D-ZS 077-10)
  • UV-A, UV-B and IR test light source 230 V/50 Hz (D-ZS 093)
  • Swivel mount for the alignment of the flame sensor (D-ZS 033-I)
  • Thermal isolator with electrical insulation (D-ZS 117-I)
  • Ball valve for closing the sighting tube (D-ZS 133-I)
  • Terminal box for connecting flame sensor (D-ZS 140)

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