Lufft CHM 15k User manual

General Information - 1 -
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General Information 2
Contents
 .......................................................................................................................
 ............................................................................................................................
 ............................................................................................................................................
  ..........................................................................................................
  ....................................................................................
 ................................................................................................
  .............................
 .......................................................................................................
  ................................................................................................
 ...................................................................................
   ........................................................................................................
  .........................................................................................................................
 ................................................................................................................................
  .................................................................................................................
 ...........................................................................................................................
 ..................................................................................................................
  ..................................................................................................
  ......................................................................................
  .................................................................................................................
  .........................................................................................
......................................................................................................
 ....................................................................................................................................
   ...........................................................................................................
 .....................................................................................................................
  ....................................................................................................
  ...............................................................................................................
 .....................................................................................
 ...................................................................................
 .......................................................................................
  ................................................................................................................................
  ..................................................................................................................................
 .......................................................................................
 ...............................................................................................
  ............................................................................................
  ........................................................................................................
 .................................................................................................................
 ...........................................................................................................
  .............................................
 ............................................................................................................
 ...................................................................................................................
  ...........................................................................................................................
  ...........................................................................................................
  ..........................................................................................................
  ..........................................................................................................
  ..................................................................................................................
  .......................................................................................................

Operating Manual CHM 15k R13 / 07-2019
General Information 3
  ..............................................................................................
  ...................................................................................................................................
  .......................................................................................................................
 ...............................................................................................................................
 ......................................................................................................................
  .............................................................................................................................
  ...........................................................................................................
  .....................................................................................................................
  ............................................................................
  ....................................................................
  .............................................................
  ....................................................................................
  .....................................................................
  .............................................................................................................................
  ...............................................................................................................................
 .............................................................................................................
 .....................................................................................................................
 ....................................................................
 ..............................................................................................................
  ..........................................................................................
  ........................................................................................
 ........................................................................................................
 ...............................................................................................
 ..........................................................
 ................................................................................................
  ...............................................................................................................
 ..............................................................................................
  .......................................................................................................
  ......................................................................................................
  .....................................................................
  ..................................................................................................................................
  .....................................................................................
 ........................................................................................................................................
   .........................................................................................
   ......................................................................................................
 ............................................................................................................................
  .............................................................................................................................

General Information 4
1 
This operating manual is part of the equipment. It must always be kept close to
the equipment so that it can be accessed quickly when needed.
This operating manual must be read, understood and observed in all respects by
all persons responsible for the equipment and all persons who work on it. This
concern, in particular, the section "Safety".
Editorial deadline: July 2019
Documentation number: 8350.MEP
This operating manual is valid for the following versions of the equipment:
CHM 15k with the order numbers:
8350.00
8350.01
8350.01-BW
8350.03
8350.B050
8350.10
Manufacturer
G. Lufft Mess- und Regeltechnik GmbH
Gutenbergstraße 20
70736 Fellbach, Germany
Phone [phone] 831
Fax [phone] 41
E-mail [e-mail]
Date
Revision
Firmware
Notes
March 2014
IO
0.723
previous Jenoptik release
December 2014
R04
0.730
cloud algorithm optimized in precipitation cases,
parameter in RS485 / web-interface added, chapter 7-8
corrected
November 2015
R06
0.735
Fixes chapter 9, table SCI
November 2016
R09
0.743
all chapter revised
April 2019
R12
1.015
chapter 1 - 8 revised, safety regulations updated
July 2019
R13
1.020
chapter 10,11, technical data, safety regulations revised
Copyright
© 2019
This manual is protected by copyright. No part of this manual may be reproduced in any form (photograph,
photocopy, microfilm or any other method) or processed, duplicated or distributed using electronic systems
without the written permission of G. Lufft GmbH. Violations will be prosecuted.
The manual was prepared with due care.No liability is assumed for damages resulting from failure to observe
the information contained in the manual.

Operating Manual CHM 15k R13 / 07-2019
Safety... 5
1.1 Symbols used
Remarks for the smooth use of the equipment
Required action step
2 
2.1 Standards and Directives
The device is designed according to the recognized rules of technology and safety and is manufactured
in series unchanged. The applied rules are listed in the currently valid declaration of conformity.
Declarations of conformity can be downloaded from our homepage:
https://www.lufft.com/products/cloud-height-snow-depth-sensors-288/ceilometer-chm-15k-nimbus-2300/
2.2 Safety instructions for the laser system
-1:2014-06. It
complies with 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50, dated June 24,
2007. The sensor emits a beam of invisible laser radiation (1064 nm) with small divergence (< 0.5 mrad)
and a beam diameter of 90 mm. A warning label is attached to the front of the instrument (see 2.6). Class
1M radiation is regarded safe except when viewed with telescope optics. The instrument may only be
operated in a protected outside area. The following precautions must be taken when operating the sensor:
•Never view the laser beam with optical instruments, especially binoculars
•Avoid looking directly into the laser beam
•Do not operate the instrument with the inner sensor door open
•Do not operate the sensor horizontally (maximum tilt angle 20°)
•Keep the beam path free of reflecting materials
The laser radiation emitted by the sensor is generated by an embedded Class 3B laser. Even short
exposure to Class 3B laser radiation can lead to injuries to the eye and skin. Maintenance and service of
the sensor may only be carried out by trained personnel. Under no circumstances may the laser be
removed from the measuring unit or any protective covers removed!
2.3 Requirements for the personnel
•The CHM 15k may only be installed and commissioned by trained personnel who have
received instructions in safety-related matters. Electrical connection of the device may only
be carried out by a qualified electrician.
•Maintenance and adjustment work on the CHM 15k may only be carried out by the service
staff of G.           
maintenance work requires a technical qualification in electrical safety.
•Every person assigned to install and commission the CHM 15k must have read and
understood the complete user manual.
•During all work on the equipment, personnel must not be overtired and must not be under
the influence of alcohol, medicines or intoxicants. The personnel must have no physical
limitations that temporarily or permanently restrict their attention and judgment.
2.4 Safety instructions for transport, installation, commissioning and cleaning
•The CHM 15k may only be loaded and transported in the packed condition and in the
transport position (see Figure 5) using suitable lifting gear and transport equipment.
•Inside the shipping container /        
slipping, shock, or other mechanical impacts, e. g. by using straps.

Operating Manual CHM 15k R13 / 07-2019
Safety... 6
•If the CHM 15k is not installed immediately, it must be stored so as to be protected from
external influences and adequately secured.
•At least two people are required to install the CHM 15k.
•Once the CHM 15k has been installed, it must be checked. Make sure that no safety-related
changes have taken place on the device.
•The inner housing door may only be opened by the service staff of G. Lufft GmbH or by the

•Never operate the sensor if a cover window is broken. Return the sensor to Lufft for repair.
•Explosion hazard: do not install the CHM 15k in hazardous locations.
2.5 Description of the warnings
2.5.1 Description of warning symbols
Symbol
Use
Warning of a general hazard
Warning of laser beam
Warning of dangerous electrical voltage
Warning of hot surface
Electrical equipment marked with this symbol may not be
disposed of in European domestic or public disposal systems.
Return old or end-of-life equipment to the manufacturer for
disposal at no charge to the user.
2.5.2 Description of precautionary statements
WARNING
Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
NOTICE
Indicates a situation which, if not avoided, may cause damage to the instrument. Information
that requires special emphasis.

Operating Manual CHM 15k R13 / 07-2019
Safety... 7
2.6 Product labeling CHM 15k
In Figure 1 the product labels are shown. The type plate and the protective earth connection are located on
the back of the housing foot.
Figure 1 Labeling, the type plate is fixed on the back side of the pedestal.
2.7 Designated use
The operational safety of the CHM 15k is only guaranteed if used as designated in accordance with the
instructions in this operating manual.
The device is designed for single phase operation on a public low-voltage network in accordance with
IEC38, 6th edition, 1983.
The ceilometer may be used only in a protected outside area. In standard operation, the laser beam is
aligned to the zenith, i. e. the device measures vertically. It can be tilted with adequate accessories to a
maximum tilt angle of 20°. Any use beyond this limit is considered non-designated use! The operator
bears sole responsibility for any resulting damage.
Horizontal use represents a safety risk for third parties and is expressly excluded.
For trouble-free operation, follow a regular cleaning and maintenance cycle (see chapter 10).
Never operate the sensor if a cover
window is broken! Refer to section 10
for a detailed explanation.

Operating Manual CHM 15k R13 / 07-2019
Technical Data 8
3 
3.1 Ordering information
Equipment Versions
Order number
Description
Power supply
Cable
length
8350.00
CHM 15k Basic
230 VAC ±10%
10 m
8350.01
CHM 15k + DSL Modem
230 VAC ±10%
3 m
8350.01-BW
CHM 15k + DSL Modem with AIT
identification code
230 VAC ±10%
3 m
8350.03
CHM 15k + DSL prepared
230 VAC ±10%
10 m
8350.10
CHM 15k- US/CA
115 VAC ±10%
10 m
8350.B050
CHM 15k EU
230 VAC ±10%
50 m
Table 1 Equipment versions.
General remarks: The standard cable length is 10 m for the RS485, LAN (or DSL) and power cable.
DSL, battery backup are options and are also available for the 115 VAC device version.
3.2 Technical data
Measurement parameters
Measuring range
0 5 km (0 50000 ft)
Cloud detection range
10 15 km (33 50000 ft)
Resolution (measured)
5 m
NetCDF data resolution (*)
5 m 30 m in 5 m steps (can be set by the user)
15 m (default setting)
NetCDF high resolution data
5 m (defined for limited HR vector of data)
Logging time and reporting
cycle (*)
2 s to 600 s (programmable)
Default value: 15 s
Measurement objects
Aerosols, clouds (droplets, ice crystals)
Measured / set parameters
Backscatter raw data
Cloud heights up to 9 layers including penetration depth, max.
detectable range (MXD), vertical visibility (VOR), Sky Condition
Index (SCI), cloud cover (TCC, BCC), ...
Measuring principle
Lidar (optical, time of flight)
Optical parameters
Light source
Nd:YAG solid state laser, diode pumped
Wavelength
1064 nm
Spectral width
0.1 nm
Output power Pavg (max)
59.5 mW
Pulse repetition rate
5-7 kHz
Pulse duration
1 ns
Laser divergence
<0.5 mrad
Filter bandwidth
1 nm
Long-time stability over 12
months (pulse repetition rate)
<10 %
Filter bandwidth
1 nm
Field-of-view receiver (FOV)
0.45 mrad
Extended NOHD
1 km (for 50 mm aperture)

Operating Manual CHM 15k R13 / 07-2019
Technical Data 9
Data interfaces
Standard interfaces
RS485 half duplex (ASCII); LAN (http, (S-)FTP, NetTools)
Optional interfaces
DSL, RS232 (service)
Electrical parameters
Power supply
230 VAC ±10 % or 115 VAC ±10 %
Line frequency
50 Hz, 60 Hz
Power consumption
Max 800 VA with activated case heater (default);
Max 300 VA without activated case heater
Power consumption in W
(depends on supply voltage)
LOM heater: 250 W @115 / 230 VAC
Case heater: 450 W @115/ 230 VAC
UPS functionality (optional)
Internal backup battery for the electronics (> 1 hour)
Equipment safety
Environmental requirements
ISO 10109-11
Laser Protection Class
1M according to IEC 60825-1:2014; complies with 21 CFR 1040.10
Protection housing
IEC/ EN 60529: IP 65; IEC/EN 61010-1: IK06 (1 Joule)
Protection electrical safety
Protection class I (protective earth needed)
Overvoltage Category
II
Pollution degree in IP65
housing
2
EMC
EN 61326 Class B (industrial use)
Conformity
CE
Operating conditions
Temperature range
-40°C to +50°C
Relative humidity
0% 100%
Wind
60 m/s
Maximum operating altitude
2000m
Dimensions
Enclosure dimensions
(footprint x height)
W x H x L = 0.5 m x 0.5 m x 1.55 m
Packaging dimensions
W x H x L = 0.75 m x 0.86 m x 1.80 m
Weight
Weight
70 kg (complete system)
9.5 kg (measuring unit heaviest replacement part)
Installation requirements
Suitable low-voltage
distribution systems
TN-S system: grounded mains, grounded 15k enclosure,
neutral and protective conductor are separate
TN-C-S system: grounded enclosure 15k, neutral and
protective conductor in one conductor led outside the CHM 15k,
but inserted and connected separately into the enclosure
Connection type
Fixed connection, grounding by means of ground connection clamp
(see Figure 12)
Resources to be provided by the operator
Lightning protection
- Internal lightning protection is provided
- External lightning protection must be provided
Grounding
Grounding system according to DIN V VDE 0185-3
Requirements for installation
- Isolation device for disconnection from low-voltage network in close
proximity to the CHM 15k
- Easily accessible
- Marked as belonging to the CHM 15k
- Pre-fuse according to cable cross-section 6 A, B or C

Operating Manual CHM 15k R13 / 07-2019
Technical Data 10
Table 2 Technical data.
(*) the combination of high temporal and range resolution over the full range is limited due to file size and
processing time. Example: 15 m resolution over 15 km range with 15 s resolution ➔24 MB daily file size
(is our standard operating mode); a combination of 5 m range resolution over the full range of 15 km and
2 s time resolution would lead to >500 MB daily files. Any combination of >100MB daily NetCDF file sizes
is not supported by Lufft.