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D-LX 110

D-LX 110/710
Optical compact flame monitor

Easy, versatile and flexible compact flame monitor with integrated UV, VIS or IR flame sensor for monitoring gas, oil and coal flames. Particularly for applications with single burner view.

D-LX 710 for application with


Functionality: Optical flame monitoring

  • Large temperature range: Deployable without change, certified and without the need for accessories for insulation, heating or cooling
  • Two-channel control unit module for highest safety simultaneously with high availability
  • Ideal support of Functional Safety within safety chains up to SIL 3
  • Two flame ON/OFF contacts for the flame signal (normally open and normally closed)
  • D-LX 110 and D-LX 710: Variants for direct view or for combination with fibre optic systems, also in hazardous areas
  • Easy replacement of consumable parts
  • Local display: Operational status and settings visible at a single glance, for complete temperature range and all variants
  • Easy access to the available settings reduces the time required for commissioning 
  • Choice of the available detectors allows the monitoring of flames of all fuels within the same device family
  • The same device technology can be used for plants in the most varied regions and on the basis of a wide range of systems of standards
  • If the requirements for the plant change (Ex zones, need for fibre optic systems) exchange within the device family is usually possible
  • The ability to adjust the settings outside the factory allows prompt exchange with smaller local stocks of replacement devices are low
  • Simple combustion plants with single burners or optically separated burners
  • Combustion processes in continuous operation
  • Technical data
  • Explosion protection
Spectral sensitivityUV, VIS, IR
Operating modeIntermittent operation and continuous operation
Functional SafetySelf-monitoring and fail-safe, supports safety chains up to SIL 3
Switching thresholdFlame intensity
Local displayLEDs – always visible at a single glance for all versions
Flame failure detection time (FFDT)0.5 … 5 s (in steps of 0.5 s)
Flame ON/OFF contacts1x NO contact, 1x NC contact
Ready for operation contact1x NO contact
Switching capacity of relay contactsMax. 24 VDC, 250 VAC
Analogue output0/4 … 20 mA (selectable), load max. 750 Ohm
Opening angle6° (D-LX 110)6° horizontal, 12° vertical (variant UL)
Electrical data24 VDC, 7 W, PELV
Ambient conditions-40 … +75 °C-40 … +70 °C (variant UL)
Degree of protectionIP66/IP68, NEMA 4XIP65, NEMA 4X (/MP7)IP66, NEMA 4X (Ex variants)
ConnectionsD-LX 110: Sight tube G 1¼″ or NPT 1¼″, FPurge air G ½″ or NPT ½″, F
DimensionsHousing M5: 100 x 100 x 260 mmHousing M4: Ø 120 mm, length approx. 310 mm
WeightHousing (without cable):M5: approx. 1.3 kg M4: approx. 3.0 kg
D-LX 110/710 ../M4/84Exll 2G Ex db llC T6 or T5 Gbll 2D Ex tb lllC T85 °C or T100 °C Db
D-LX 110/710 ../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 110/710 ../M5/86ExCl. l, Div. 2, Gr. A, B, C, D T6/T4Cl. ll, Div. 2, Gr. E, F, G T6/T4; Cl. lll
D-LX 110/710 ../M5/87Exll 3G Ex ec nC llC T6 or T4 Gcll 3D Ex tc lllC T80 °C or T130 °C Dc
  • Mandatory
  • Recommended
  • Optional
D-LL 7xx (for D-LX 710)
D-ZS 033-I - Swivel mount for alignment of flame monitor to the flame to be monitored
D-ZS 117-I - Thermal isolator with electrical insulation
D-ZS 133-I - Ball valve for closing sighting tube
Power supply 24 V - Wide range power supply unit for supply of several D‑LX 110
D-NG 24/05
D-ZS 077-10 - UV-C test light source 230 V / 50 Hz
D-ZS 093 - UV-A, UV-B and IR test light source 230 V/50 Hz
D-ZS 087-20 - Digital display for optimal adjustment of the flame sensors by measuring the pulse rate and its extreme values
D-ZS 113 set - Set of apertures 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