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D-LX 721 Flame Monitor Fibre Optic with Software Interface

Self-monitoring and fail-safe compact flame monitor with fibre optic system and software interface, for the monitoring of gas, oil and coal flames.



Self-monitoring and fail-safe flame monitor with fibre optic system and software interface.

Application with flexible fibre optic system D-LL 703, or rigid fibre optic system D-LL 704.

  • Wide sensitivity range
  • For ambient temperatures from -40°C up to +85°C
  • Highest safety combined with highest availability
  • Ideal Support for Functional Safety
  • Selective to individual burners and fuels
  • Wide range of certifications and standards covered
  • Low maintenance requirements
  • Local display for status and flame intensity
  • Optional flame stability analysis in real time


  • Terminal box for connecting the flame monitor (D-ZS 140-12)
  • Installation flange for D-LL 703 fibre optic system (D-ZS 703)
  • Welding flange for D-LL 704 fibre optic system (D-ZS 704)
  • Wide range power supply unit for supply of several D‑LX 721 (D-NG 24/25a)
  • D-LX 200 Test kit for software supported tests of the compact flame monitors D-LX 200/720 and D-LX 201/721


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