The LIDAR-based cloud height sensor / ceilometer CHM8k is prepared to work throughout the year and in any climate
The CHM 8k is the latest ceilometer from Lufft. Using the Lidar technique, it detects backscatter aerosol profiles / structure in multiple layers, cloud bases, cloud penetration depths as well as vertical visibility and issues the sky condition index. It has an operating range of up to 8,000m (26,200 ft) and is equipped with an integrated controller offering a fully embedded real-time calculation of all target parameters and comfortable user interfaces. The Lufft ceilometer series is prepared to work throughout the year and in any climate. Due to their double case structure combined with a window blower and an automatic heating system, the ceilometers are free of fogging, precipitation, freezing or overheating issues.
- Aerosol backscatter profile, cloud base height, cloud penetration depth, aerosol layer height, cloud cover, vertical visibility, Sky Condition Index
- Optical (LIDAR)
- Measuring range of up to 8 km (26.246 ft), simple & eye-safe, service-friendly due to modularity, various data telegrams, sensitivity in the range of the Lufft CHM 15k, suitable for the most demanding environments
- RS485 (ASCII communication), LAN (Web-Interface, (S-)FTP, NetTools); optional: DSL modem, RS232 for service
- 8349.01-010
| Measuring principle | Lidar (optical, time of flight) |
| Measuring parameters | |
| Description | Aerosol backscatter profile |
| Measuring range | 0 … 10 km (0 … 32,808 ft) |
| Cloud detection range | 5 m … 8 km (16 … 26,246 ft) |
| Time resolution | 2 … 600 s |
| Range resolution | 5, 10, 15 m |
| Quality and auxiliary values | External and internal temperature, window status, laser status, receiver status |
| Target parameters | |
| Quantities given in layers | Cloud base height, cloud penetration depth, aerosol layer height |
| Number of layers | 1 – 9 layers (programmable), 3 layer preset |
| Distance masurement accuracy against hard target | Greater of ±5 m (±16 ft) or ±0.2% |
| Additional quantities | Cloud cover in octas (WMO 2700), Vertical visibility in m, Sky condition index |
| Communication | |
| Standard interfaces | RS485 (ASCII communication) LAN (Web-Interface, (S-)FTP, NetTools) |
| Optional interfaces | DSL modem, RS232 for service |
| Electrical parameters | |
| Power supply | 230 VAC or 115 VAC, ±10 % |
| Power consumption | 250 W (Standard) 450 W (in maximum heating mode) 800 W (opt. special version for extended temperature range) |
| UPS functionality (opt.) | Internal backup battery for electronics, > 1 hrs |
| Laser-optical parameters | |
| Light source | Laserdiode |
| Wavelength | 905 nm |
| Pulse energy | < 3 |
| Pulse repetition frequency | 8 kHz |
| Filter Bandwidth | 25 nm |
| Field of view receiver | 1.1 mrad |
| Operating Safety | |
| Environmental compliance | ISO 10109 – 11 |
| Laser protection class | 1M, IEC 60825-1:2014; complies with 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007 |
| Protection level housing | IP65 |
| Electrical Safety | EN 61326 – 1 Class B |
| Certifications | CE (230 VAC); 115 VAC version compatible with FCC/ CSA |
| International standards | Complies with ICAO frangibility requirements |
| Operating Conditions | |
| Temperature range | -40 … +60 °C |
| Relative humidity | 0 … 100 % |
| Wind | 55 m/s |
| Physical | |
| Dimensions | 500 x 500 x 1550 mm |
| Weight | 70 kg (130 kg incl. Packaging) |
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