LUFFT Ceilometer CHM8k Cloud Height Monitor

The new Lufft CHM 8k ceilometer enables meteorologists at weather services and airports to make decisions with the highest confidence and minimal maintenance. Especially in the critical height below 1 km, the Lufft CHM 8k detects cloud bases in any place and season with outstanding precision and reliability. Internal data storage and a battery backup enable unmatched sensor uptime and data availability even at the harshest conditions.

Using technology, 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.

Parameters measured: Aerosol backscatter profile, cloud base height, cloud penetration depth, aerosol layer height, cloud cover, vertical visibility, Sky Condition Index
Measurement technology: Optical (LIDAR)
Product highlights: 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
Interfaces: RS485 (ASCII communication), LAN (Web-Interface, (S-)FTP, NetTools); optional: DSL modem, RS485 full-duplex

Features:

  • Confident detection of low clouds with minimum False Alarm Rate (FAR) and an outstanding Probability of Detection (POD) even at extreme conditions.
  • Maximum sensor uptime and data availability thanks to integrated data storage and a robust battery backup (-40 °C to 60 °C).
  • Minimum maintenance from self-cleaning construction: Snow gets melted, water flows down and washes dust away.
  • Safe and certified operation in compliance with UL50e (North America), TÜV (Europe), ICAO GRF.
  • Easy installation and handling thanks to self-contained design – no additional computer needed.
  • High flexibility from support of multiple communication protocols and software standards.

Download Specifications

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Brand

Tunnel & Roads Transport

Weather & Meteorology

Technical Data

Measuring principle Lidar (light detection and ranging)
Measuring parameters
Aerosol backscatter profile
Measuring range 0 m … 10 km (0 … 32,808 ft)
Time resolution 2 … 600 s
Range resolution 5 m
Reported Range resolution 5 – 30 m in 5 m steps
Cloud base heights, Cloud penetration depths 1 – 9 layer (configurable);
3 layer preset
Cloud detection range 5 m … 8 km (16 … 26.246 ft)
Distance measurement accuracy against hard target ‘Greater of ±5 m (±16 ft) or ±0.2%
Additional measuring quantities Cloud cover in octas (WMO 2700), Vertical visibility, Aerosol layer heights (mixing layer, boundary layer), sky condition index
Quality and auxiliary values External and internal temperature; window, laser and receiver status, input voltage control, humidity
Communication
Standard interfaces RS485 half-dublex (ASCII communication), LAN (Web-Interface, (S-)FTP, NetTools)
Optional interfaces DSL modem, full dublex
Electrical parameters
Power supply 230 VAC or 115 VAC, ±10 %
Mains frequency 50, 60 hz
Power consumption 250 W (w/o housing heater)
450 W (with housing heater)
UPS functionality (opt.) Internal backup battery for electronics (1 hour covering all operating conditions)
Laser-optical parameters
Light source Laser diode
Wavelength 905 nm
Pulse energy 2 μJ max. (1,6 μJ typ.)
Pulse repetition frequency 8 kHz
Filter Bandwidth 25 nm
Field of view receiver 1.1 mrad
Operating Safety
General Safety IEC 61010-1 (TUEV Rheinland certified)
UL 61010-1 (TUEV SÜD certified)
AS 61010.1 (Australien und Neuseeland)
CAN/CSA-C22.2 No. 61010-1 (TUEV SÜD certified)
Laser protection class 1M, IEC 60825-1:2014; complies with CFR 1040.10
Protection level housing IEC 60529: IP66
EMC EN 61326 – 1 Klasse B
FCC: 47 CFR Part 15, Class B
Certifications CE (230 VAC); 115 VAC version compatible with FCC/ CSA
International standards Complies with ICAO frangibility requirements
Operating Conditions
Operating Conditions ISO 10109 – 11
Temperature range -40…+60 °C
Relative humidity 0…100 %
Wind load 60 m/s
Physical
Dimensions 500 x 500 x 1550 mm
Weight 70 kg (130 kg incl. Packaging)

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