D-LX 720
Compact flame monitor with fibre optic system
Application with
Please note that this product will be discontinued on December 31st, 2019. Further details are given in the discontinuation letter (English, German).
A modernised successor product is available.
Overview
- Wide sensitivity range
- For ambient temperatures from -40°C up to +85°C
- Dual channel design throughout
- Measurement of flame flicker frequency
- Selective to individual burners and fuels
- Optionally with complete SIL3 certification
- Available with cable gland, cable plug (version /MP) or as version for hazardous areas
Applications
- Burners with difficult installation conditions for conventional flame sensors or on those whose ambient temperature near the sighting tube is too high
- Power stations
- Chemical industry
- Refineries
- Cement plants
- Waste incinerators
- Steam generators
- Heating plants
Technical Data
| Operational mode | Intermittent operation and continuous operation |
| Safety | Self-monitoring and fail-safe |
| Auxiliary supply | 24 VDC |
| Flame relay | 1x NO contact, 24 VDC, 0.5 A |
| Status relay | 1x NO contact, 24 VDC, 0.5 A |
| Flame Failure Detection Time (FFDT) | 1, 2, 3, 5 s |
| Analogue output | 0/4...20 mA |
| Spectral ranges | UV, IR |
| Ranges | 2 |
| Threshold switches | Flame intensity and flicker frequency |
| Communication | LED, Modbus RTU, IrDA |
| Ambient temperature range | -40...+85°C |
| Protection class | IP66/68 IP65 for version /MP |
| Dimensions | 85 x 85 mm, length approx. 175 mm |
| Weight | approx. 1.25 kg |
| Ex protection | |
| D-LX 720 ../84Ex | II 2G Ex d IIC T6 or T5 Gb II 2D Ex tb IIIC T85°C or T100°C Db |
| D-LX 720 ../85Ex | Cl. I, Div. 1, Gr. A, B, C, D T6/T5 Cl. II, Div. 1, Gr. E, F, G T6/T5; Class III Type 4 Hazardous locations: indoor/outdoor |
| D-LX 720 ../86Ex | Cl. I, Div. 2, Gr. A, B, C, D T6/T4 Cl. II, Div. 2, Gr. E, F, G T6/T4; Class III Type 4 Hazardous locations: indoor/outdoor |
| D-LX 720 ../87Ex | II 3G Ex nAnC IIC T6 or T4 Gc II 3D Ex tc IIIC T85°C or T135°C Dc |
| Max. ambient temperature | +85°C (/84Ex, /85Ex) +65°C (/86Ex, /87Ex) |
| Protection class | IP66 |
| Dimensions | Ø120 mm, length approx. 230 mm |
| Weight | approx. 3.2 kg |
Downloads
Brochures
Accessories
- LED bar graph display for the flame intensity (D-ZS 129)
- 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 720 (D-NG 24/25a)
- D-LX 200 Test kit for software supported tests of the compact flame monitors D-LX 200/720