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Flame monitor D-LX 200

D-LX 200/720
Optical compact flame monitor

Flexible and selective compact flame monitor for high requirements. For optical monitoring of all fuel flames, including in complex multi-burner plants.

D-LX 720 for application with

Please note that this product was discontinued on December 31st, 2019. Further details are given in the end of life notification (English, German).

Versions with CSA certification can still be purchased.

A modernized successor product is available.


Functionality: Optical flame monitoring

  • Wide sensitivity range
  • For ambient temperatures from -40 °C … +85 °C
  • Consistently two-channel
  • Measurement of the flicker frequency of the flame
  • Burner and fuel selective
  • Optionally with full SIL 3 approval
  • D-LX 201 InformationCentre for logging of the flame signal and parameters as an ideal supplement for commissioning up to six flame monitors simultaneously
  • Fulfillment of special requirements: Flexible presettings for different combustion situations and fuels
  • Same technology for different applications: The same product family can be used for plants in the most varied regions and on the basis of a wide range of systems of standards
  • Complex combustion plants including plants with many burners and different fuels
  • Monitoring of burner flames with widely varying fuels
  • Combustion processes with high Functional Safety requirements
  • Combustion processes in continuous operation
  • Technical data
  • Explosion protection
Spectral sensitivityUV, IR
Operating modeIntermittent operation and continuous operation
Functional SafetySelf-monitoring and fail-safe, supports safety chains up to SIL 3 (high demand mode / low demand mode)
Switching thresholdFlame intensity and flicker frequency
Local displayLEDs – always visible at a single glance for all versions
Flame failure detection time (FFDT)1, 2, 3, 5 s
Flame ON/OFF contact1x NO contact
Ready for operation contact1x NO contact
Switching capacity of relay contactsMax. 24 VDC, 0.5 A
Analogue output0/4 … 20 mA, load max. 750 Ohm
Opening angle6° (D-LX 200)
Electrical data24 VDC, 5 W, PELV
Ambient conditions-40 … +85 °C
Degree of protectionIP66/IP68, NEMA 4XIP65, NEMA 4X (/MP3)IP66, NEMA 4X (Ex variants)
ConnectionsD-LX 200: Sight tube G 1¼″ or NPT 1¼″, FPurge air G ½″ or NPT ½″, F
DimensionsHousing P2: 80 x 80 x 250 mm Housing M5: 100 x 100 x 260 mm Housing M4: Ø 120 mm, length approx. 310 mm
WeightHousing (without cable):P2: approx. 0.9 kg M5: approx. 1.2 kg M4: approx. 2.8 kg
D-LX 200/720 ../M4/85ExCl. l, Div. 1, Gr. A, B, C, D T6/T5Cl. ll, Div. 1, Gr. E, F, G T6/T5; Cl. lll
D-LX 200/720 ../M5/86ExCl. l, Div. 2, Gr. A, B, C, D T6/T4Cl. ll, Div. 2, Gr. E, F, G T6/T4; Cl. lll
  • Mandatory
  • Recommended
  • Optional
D-LL 7xx (for D-LX 720)
D-ZS 033-I - Swivel mount for the alignment of the flame monitor
D-ZS 117-I - Thermal isolator with electrical insulation
D-ZS 133-I - Ball valve for closing the sighting tube
Power supply 24 V - Wide range power supply unit for supply of several D‑LX 200
D-NG 24/05
D-ZS 113 set - Set of orifice plates for insertion in purge air flange
D-ZS 118 - Optical adjustment aid for the alignment of the swivel mount on the sighting tube
D-ZS 140-12 - Terminal box for connecting the flame monitor
D-ZS 141-12 - Terminal box for connecting the flame monitor
D-LX 200 test set - For software supported tests of the compact flame monitors D-LX 200/720