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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.

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Summary of Contents for CHM 15k

Page 1: ...General Information 1 Titelseite...

Page 2: ...rol and device status 13 5 Transport Scope of Delivery 14 6 Installation 15 6 1 Installing the CHM 15k 15 6 1 1 Preparatory work 15 6 1 2 Installing on the foundation 16 6 2 Electrical installation 19...

Page 3: ...8 9 Telegram via Ethernet 55 8 10 NetCDF file tools 55 9 Data Evaluation Sky Condition Algorithm SCA 56 9 1 Laser remote sensing 56 9 2 Preparation of the measured data 56 9 3 Cloud ceilings cloud bas...

Page 4: ...8 22 41 E mail service lufft de 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 w...

Page 5: ...eflecting 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 Mainte...

Page 6: ...l 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 v...

Page 7: ...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...

Page 8: ...t 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 an...

Page 9: ...ge 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...

Page 10: ...mited 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...

Page 11: ...can be replaced refreshed at the end of the laser diode lifetime A device designed for 24 7 continuous operation 4 1 Construction of the CHM 15k The enclosure of the CHM 15k is made of corrosion resi...

Page 12: ...rotection device for power cable LAN RS485 The functional units are of modular design fastened separately to the inner housing and can be removed and replaced individually for servicing purposes 4 2 1...

Page 13: ...out and controlled with higher time resolution such as the temperature control or that run in the logging time interval such as the evaluation of the window contamination and the fan controller in ca...

Page 14: ...o User manual and USB stick with communication software Fastening components o 4 dowels S12 Fischer Co o 4 screws M10 x 140 ZN DIN 571 o 4 washers ISO 7093 10 5 KST PA o 4 washers ISO 7093 10 5 A2 On...

Page 15: ...t be selected such that leaves and needles do not reach the light emission apertures of the device When installing the CHM 15k the following minimum distances must be observed to radio devices 2 5 m t...

Page 16: ...are required to install the ceilometer Install the CHM 15k ceilometer as follows Unload the CHM15k from the transport equipment and set it down as close as possible to the place of installation Figur...

Page 17: ...e protection profile Onward transport options To carry Grasp the equipment in the openings marked with arrows Figure 7 Hand truck For greater distances to the concrete foundation Figure 8 NOTICE When...

Page 18: ...ed washers and fixing screws see Figure 9 Figure 9 Fixing elements 1 Dowel S12 2 Leveling screw 5 mm integrated into the base of the device 3 Screw DIN 571 10 x 140 ZN 4 Washer ISO 7093 10 5 A2 5 Wash...

Page 19: ...or C The connection box should be installed at a distance of 3 m An external lightning conductor 5 must be installed to protect the device from direct lightning strikes All connections to the device m...

Page 20: ...onductor green green yellow Figure 11 Electrical installation L N PE br bl gn ye circuit breaker safety guard po er supply C aptop A B GND gn ye or SB serial converter optional overvoltage protection...

Page 21: ...5 GND white brown shielding as required see Figure 13 standard length 10 m Figure 13 RS485 connection to transducer 4 Data cable LAN equipped with a standard RJ45 plug for connection to a remote compu...

Page 22: ...length depending on outdoor temperature conditions The time until measurement data are available in high quality can be between 2 minutes warm start and one hour cold start at 40 C The CHM15k automat...

Page 23: ...be set to at least 19 200 baud 7 2 Starting up with the LAN connection In addition or as an alternative to the RS485 connection a LAN connection Ethernet can also be used Requirement A connected LAN...

Page 24: ...queried by the user via RS485 too using the parameter IPS instead of IPD e g get SPACE RS485Number IPS CR LF set SPACE RS485Number IPS xxx xxx xxx xxx CR LF For further support regarding communicatio...

Page 25: ...tice Disposal of the CHM 15k ceilometer must be in accordance with national regulations Electrical equipment marked with this symbol may not be disposed of in European domestic or public disposal syst...

Page 26: ...mmands as described in 8 1 The incoming start and end flags STX and EOT indicate a current receive transmission 8 1 List of configurable parameters Table 4 contains the most important settings These a...

Page 27: ...5 600 s Gateway GAT 0 0 0 0 Set queries the static gateway address HardwareVersion HWV Device dependent see Table 23 HttpPort HPT 80 Specifies http port to access the web interface of the ceilometer...

Page 28: ...set to the factory settings see 8 2 4 web interface set to factory setting RestartNetwork RSN 0 0 1 writes the new settings in the configuration file and restarts the network RS485Number RNO 16 0 99 u...

Page 29: ...Firmware FPGA VersionLinux VLI Operating system version Table 5 List of read only parameters accessible via the RS485 interface RS485 only for RS485 available Explanatory notes to Table 4 AFDMode Swit...

Page 30: ...nds to 13 24 30 E MaxCrossTalkChars The number of characters the CHM 15k will ignore within the time interval TimeOutRS485 s if not ended with EOT 04 HEX CR 0D HEX LF 0A HEX The parameter is included...

Page 31: ...m to 8 3 5 Raw data telegram 8 2 2 Setting a parameter A configuration parameter is changed via the command set SPACE RS485Number ParameterName Value CR LF A successful change is confirmed with STX se...

Page 32: ...The command set SPACE RS485Number Reset 1 CR LF instructs the internal processor to perform an immediate restart This restart takes less than one minute Communication with the CHM 15k is not possible...

Page 33: ...ransferMode 0 CR LF sets the polling mode and thereby any previously running automatic telegram output is issued With the three commands get SPACE RS485Number S CR LF get SPACE RS485Number L CR LF get...

Page 34: ...7 SPACE 20 HEX 8 10 Output interval s 11 SPACE 20 HEX 12 19 Date dd mm yy 20 SPACE 20 HEX 21 25 Time hh mm 26 SPACE 20 HEX 27 31 Cloud base layer 1 see section 9 3 32 SPACE 20 HEX 33 37 Cloud base lay...

Page 35: ...ith a minus sign or slash Detailed information on the type of device error can be found in the status codes see 8 5 Status code Correction of the measured cloud height The cloud height is usually meas...

Page 36: ...t in m or ft 87 3B HEX 88 89 Precipitation index Sky Condition Index SCI 90 3B HEX 91 98 System status 32 Bit status code see 8 5 Status code 99 3B HEX 100 101 RS485 identification number CHM 15k in t...

Page 37: ...height 189 3B HEX 190 195 Laser operating hours h 196 3B HEX 197 199 Window status 200 3B HEX 201 205 Laser frequency PRF 5 digits 206 3B HEX 207 209 Receiver status 210 3B HEX 211 213 Light source st...

Page 38: ...pulses in the measuring interval 7 digit Receiver status Evaluation of the status of the optical path and receiver 100 maximum sensitivity 0 no sensitivity Light source status Evaluation of the stabi...

Page 39: ...2 M CR LF Line 3 M CR LF Line n 2 M CR LF Line n 1 E CR LF Line n end CR LF The character indicates a UUencode ASCII character in the range HEX 21 60 The M HEX 4D at the beginning of the data lines s...

Page 40: ...ncing in this mode Because the transmission rate depends on the time resolution of the measured data and the RS485 interface settings this transmission would take too long A one day NetCDF file with d...

Page 41: ...obal attributes Attribute Description Type title Heading for graphical representation here Lufft Berlin CHM 15 Text source see device_name left for compatibility reasons Text device_name Serial number...

Page 42: ...length of range gate with high resolution binwidth life_time int time h laser life time error_ext int time 32 bit status code state_laser byte time percent laser quality index state_detector byte time...

Page 43: ...cloud cover bcc byte time base cloud cover sci byte time sky condition index 0 nothing 1 rain 2 fog 3 snow 4 precipitation or particles on window vor short time m vertical optical range voe short time...

Page 44: ...APD bias 4 10 Error Error Create new NetCDF file 5 20 Error Error Write add to NetCDF error 6 40 Error Error RS485 telegram cannot be generated and transmitted 7 80 Error Error SD card absent or defec...

Page 45: ...us code For example information warnings and errors relating to temperatures group 3 are in the third place from the right i e xxxxxTxx In each group only the highest priority error the highest error...

Page 46: ...n best performance range setpoint 1 C 3 C 60 xxxx x3xx Laser optical module LOM temperature outside the valid range 25 C 49 C 60 xxxx x4xx Internal temperature outside the working range 5 C 50 C 16 xx...

Page 47: ...xxx Values from detector signal zero or void 16 xx7x xxxx Insufficient test laser signal available 16 xx8x xxxx No window pulse in receiver signal 16 xxDx xxxx No receiver signal detector or HV supply...

Page 48: ...loading full day NetCDF raw data In general the web interface contains the following access rights End users can check the status of the instrument Superusers can download NetCDF files configure the d...

Page 49: ...Figure 17 Web interface NetCDF Files superuser Figure 18 shows the contents of the Viewer tab displaying the existing data for the last 24 hours at 5 minute intervals Clicking the Update button updat...

Page 50: ...ages Config System Config Network and Config RS485 are only accessible to superusers and service users The parameters can also be set via RS485 communication and are described in 8 1 Figure 19 Web int...

Page 51: ...e should be carefully installed See 8 8 AFD mode for further information Figure 21 shows the contents of the Config System tab which allows access to parts of the system Figure 21 Web interface Config...

Page 52: ...5 configuration service mode 8 7 4 Status and error messages process warnings The upper part of the Process Warnings tab of Figure 24 is mainly used by the Lufft service in a second or third level sup...

Page 53: ...d immediately Please note The user should avoid time settings via the date time command RS485 with simultaneous execution of ntpd over TCP IP 8 8 AFD mode A specific communication mode called automati...

Page 54: ...ory from root on server home chm_data user name afd password eXample recipient ftp afd eXample 192 168 1 51 home chm_data h tY tm options priority 9 create target dir time 15 lock DOT age limit 3600 e...

Page 55: ...loaded and installed from the server https nmap org download html This website also provides binary and source codes for other operating systems After a connection request from the client in the polli...

Page 56: ...rom the travelling time of the laser pulses 9 2 Preparation of the measured data Data pre processing is an important task before the different steps in the SCA algorithm begin The main reason for this...

Page 57: ...penetration depths Cloud penetration depth is determined by detecting a cloud bottom and then an upper cloud height using the signal intensity level that was determined for the cloud base Subtracting...

Page 58: ...d independently of the cloud detection algorithm and can be used to check the result e g if the ceilometer can detect neither a cloud layer nor a vertical optical range Here the MXD can be used to che...

Page 59: ...accuracy and low uncertainty Q Index Description telegram 1 NetCDF There is insufficient raw data for a calculation telegram 2 NetCDF Hardware error or system is not ready to measure telegram 3 NetCDF...

Page 60: ...DF 3 NetCDF Cloud bases could not be determined due to fog or other non meteorological reasons or no observation was made 0 Clear sky 1 1 okta 1 10 2 10 2 2 okta 2 10 3 10 3 3 okta 4 10 4 4 okta 5 10...

Page 61: ...9 Data Evaluation Sky Condition Algorithm SCA 61 Figure 29 Degree of coverage algorithm Note The selected time interval for calculating the cloud cover depends on the area in which a truncated cone fu...

Page 62: ...was treated as a precipitation index Table 20 shows how the index is defined Value Description 2 NetCDF System hardware error or system not yet ready for operation 2 in NetCDF 00 Neither fog nor prec...

Page 63: ...left corner of the windows indicates the mains voltage is switched on When the device is turned on this LED must be lit If this is not the case this indicates an unconnected cable a switched off circ...

Page 64: ...the housing cover Neutral cleaning agents microfiber cloths As required Remove fouling in front of the entrance grilles of the fans rear side Keep fan intake area clear see Figure 31 As required Remov...

Page 65: ...re against reconnection Table 22 lists the recommended preventive maintenance measures and the interval for regular checks The inner sensor housing door must be opened to carry out the maintenance mea...

Page 66: ...f only 3 to 5 years Replace LOM if signs of laser wear falling repetition rate replace SD card By service staff only Approx every 5 years As a preventive measure Replace the rubber seal of the inner d...

Page 67: ...alue not set 11 2 CHM 15k software version This manual corresponds to firmware version 1 020 of September 2019 for the CHM 15k ceilometer OS FPGA release Description Released OS 12 12 1 FPGA 2 13 CPU...

Page 68: ...DeviceName is preserved at reset settings to factory defaults 4 Apply settings to factory defaults removed in web interface will be redesigned and reintegrated in future May 2015 0 733 1 mainboard re...

Page 69: ...ion e g software_version 17 05 1 2 13 0 747 1 for Mode 1 2 Cloud detection variant higher low clouds introduced useable with new settings CloudDetectionMode 1 RS485 short CDM Restart need after changi...

Page 70: ...ownload of different settings files chm afd telegram fixed 8 Fix in Cloud Detection to version 0 727 Dimension Check Sep 2018 1 010 1 Improvement of the handling of the APD temperature read error 2 Co...

Page 71: ...shown here with fixed IP address 24 Figure 16 Web interface 48 Figure 17 Web interface NetCDF Files superuser 49 Figure 18 Web interface Viewer 49 Figure 19 Web interface Config Network read only defa...

Page 72: ...38 Table 11 Baud rate logging time restrictions 39 Table 12 Raw data telegram format any desired character 39 Table 13 Dimensions in NetCDF 41 Table 14 Global attributes in NetCDF 41 Table 15 Variable...

Page 73: ...Index of Tables 73...

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