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LUFFT Ceilometer Cloud Height Monitor (CHM) 15k Nimbus

The Lufft CHM 15k is a LIDAR cloud height sensor based on a single wavelength backscattering technique. It detects various cloud layers (max 9), cloud penetration depths, issues the Sky Condition Index, vertical field of view (VOR), aerosol layer heights, boundary layers and aerosol backscatter profiles with a range of up to 15 km. The sensor achieves excellent signal quality thanks to its stable wavelength and its Nd:YAG narrow-beam microchip laser operating in the 1064 nm range. In addition, its technology enables efficient daylight suppression and reduces temperature fluctuations to a minimum. Due to its pulse energy and laser frequency it is eye-safe and classified as a 1M laser product. Moreover, the CHM 15k features a user-friendly design that enables unattended, continuous operation. The CHM 15k is a state-of-the-art solution for today's diverse requirements of atmospheric research. It is suitable both as a sophisticated aerosol research instrument and as part of a large measurement network.

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 up to 15 km (50,000 ft), optimized detection of several cloud layers, simple eye-safe operation, service-friendly modular device design, various data telegrams including raw data
Interfaces:RS485, LAN, RS232 oder Modem V.21, V22

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Technical Data

Measuring principle Lidar (optical, time of flight)
Measuring parameters
Description Aerosol backscatter profile
Range 5 … 15,000 m (16 … 50.000 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 (CBH), Cloud penetration depth (CPD), Aerosol layer height (ALH)
Number of layers 1 – 9 layer (programmable);
3 layer preset
Distance measurement 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)
800 W (in maximum heating mode)
UPS functionality (opt.) Internal backup battery for electronics >1 hr
Laser-optical parameters
Light source Nd:YAG solid state laser
Wavelength 1064 nm
Pulse energy 7 µJ
Pulse repetition frequency 5 – 7 kHz
Filter Bandwidth 1 nm
Field of view receiver 0.45 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
115 VAC version compatible with FCC/ CSA
International standards Complies with ICAO frangibility requirements
Operating Conditions
Temperature range -40…+50 °C
Relative humidity 0 … 100 %
Wind 55 m/s
Physical
Dimensions 500 x 500 x 1550 mm
Weight 70 kg (130 kg incl. Packaging)