D-LX 720
Compact flame monitor with fibre optic system
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 |
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