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Operating Manual CHM 8k 

 

R1.7 / 01-2020 

Data Evaluation / Sky Condition Algorithm (SCA) 

61 

 

6 

6 okta: 7/10 

– 8/10 

7 

7 okta or more, but <10/10 

8 

8 okta: 10/10 

9 

Sky obscured by fog or other meteorological phenomena 

Table 21 Degree of coverage, WMO code 2700 and definitions in 10

th

. 

 

 

Figure 28 Degree of coverage algorithm. 

 
Note: The selected time interval for calculating the cloud cover depends on the area in which a truncated 
cone function is used for the calculation. 

 

Содержание CHM 8k

Страница 1: ...General Information 1 User Manual Lufft CHM 8k Ceilometer...

Страница 2: ...trol and device status 13 5 Transport Scope of Delivery 14 6 Installation 15 6 1 Installing the CHM 8k 15 6 1 1 Preparatory work 15 6 1 2 Installing on the foundation 16 6 2 Electrical installation 18...

Страница 3: ...Time server 53 8 8 AFD mode 54 8 9 Telegram via Ethernet 55 8 10 NetCDF file tools 55 9 Data Evaluation Sky Condition Algorithm SCA 57 9 1 Laser remote sensing 57 9 2 Preparation of the measured data...

Страница 4: ...odem is given in a separate supplementary sheet Manufacturer G Lufft Mess und Regeltechnik GmbH Gutenbergstra e 20 70736 Fellbach Germany Phone 49 711 518 22 831 E mail service lufft de Date Issue Not...

Страница 5: ...d by the sensor is generated by an embedded Class 3B laser module Even short exposure to Class 3B laser radiation can lead to injuries to the eye and skin Maintenance and service of the sensor may onl...

Страница 6: ...arning 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 dispo...

Страница 7: ...rk 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 verticall...

Страница 8: ...dem battery backup etc xx Country code EU or US yyy Cable length 003 3m 010 10 m 050 50m 3 2 Technical data Measurement parameters Measuring range 0 m 10 km 0 32808 ft Cloud detection range 5 m 8 km 1...

Страница 9: ...perating conditions Temperature range 40 C to 60 C Relative humidity 0 100 Wind 60 m s Maximum operating altitude 5000 m Dimensions Enclosure dimensions footprint x height W x H x L 0 5 m x 0 5 m x 1...

Страница 10: ...nge resolution over the full range is limited due to file size and processing time Any combination of 70MB daily NetCDF fle sizes is not supported by Lufft Example standard operation mode 15 m range r...

Страница 11: ...adiation Wind Precipitation Mechanical shock on the inner shell which carries the measuring unit The chimney effect between the outer shell and the inner housing supports this process and avoids high...

Страница 12: ...n fastened separately to the inner housing and can be removed and replaced individually for servicing purposes 4 2 1 Functional diagram Figure 2 Functional chart the numbers in brackets corresponds to...

Страница 13: ...message is generated and output However there are parts that are controlled internally with higher time resolution such as the temperature control of the laser and processes that run in the logging in...

Страница 14: ...he EU Declaration of conformity 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 customer s request An ad...

Страница 15: ...s must be selected such that leaves and needles do not reach the light emission apertures of the device When installing the CHM 8k the following minimum distances must be observed to radio devices 2 5...

Страница 16: ...to install the ceilometer Install the CHM 8k ceilometer as follows Unload the CHM 8k from the transport equipment and set it down as close as possible to the place of installation Figure 5 CHM 8k pac...

Страница 17: ...concrete foundation Figure 8 NOTICE When transporting with a hand truck make sure that the CHM 8k is placed on the hand truck with the exterior door facing downwards see Figure 8 A cushion e g bubble...

Страница 18: ...ply will result in the loss of warranty and warranty claims The operator must meet all the requirements for connecting the CHM 8k ceilometer in accordance with EN 61010 1 e g installation of a connect...

Страница 19: ...ive parts may result in electric shock which will cause serious or fatal injury Switch off the external circuit breaker before starting the installation and secure against reconnection The electrical...

Страница 20: ...d length 10 m OR 115 VAC supply cable mains cable color code conductor black neutral white protective conductor green green yellow Figure 11 Electrical installation 2 Grounding cable 10 mm 1 pin green...

Страница 21: ...onductor yellow B conductor green RS485 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...

Страница 22: ...adjustment phase of varying 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...

Страница 23: ...he LAN connection In addition or as an alternative to the RS485 connection a LAN connection Ethernet can also be used Requirement A connected LAN cable see 6 2 Electrical installation or LAN over DSL...

Страница 24: ...7 3 Shutdown Advanced users should carefully disconnect the device from the power supply with these steps Users with superuser authorization should use the web interface Log in as a superuser and pre...

Страница 25: ...on 8 1 List of configurable parameters Table 4 lists the most important settings These are explained in the following sections To prevent unwanted effects on the functioning of the device some options...

Страница 26: ...sion HWV Device dependent see Table 26 HttpPort HPT 80 Specifies http port to access the web interface of the ceilometer IgnoreChars ICH 06 8 bit ASCII codes Institution INS NN Institution text IPaddr...

Страница 27: ...ry 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 used with RS485 S...

Страница 28: ...processing and handling VersionFPGA VFP Firmware FPGA VersionLinux VLI Operating system version Table 5 List of read only parameters accessible via the RS485 interface RS485 only for RS485 available E...

Страница 29: ...he location decimal orientation to east positive example Berlin 13 40833 corresponds to 13 24 30 E MaxCrossTalkChars The number of characters the CHM 8k will ignore within the time interval TimeOutRS4...

Страница 30: ...presents the checksum of the two s complement formed over the whole response line excluding these two characters 3F in accordance with the protocol response formats see sections 8 3 3 to 8 3 5 8 2 2 S...

Страница 31: ...RS485 default value 30 s the incorrect baud rate is reset to the baud rate defined in the parameter BaudAfterError This guarantees that the user can regain control of the device after this waiting per...

Страница 32: ...s are only output on a specific request polling mode 1 Automatic output of the standard data telegram 2 Automatic output of the extended data telegram 3 Automatic output of the raw data telegram 4 9 A...

Страница 33: ...15 seconds by default Table 8 contains the format of the standard data telegram The output of the extended data telegram is set with the command set SPACE RS485Number TransferMode 2 CR LF Table 9 cont...

Страница 34: ...d heights are detected the text NODET appears in the remaining fields If cloud penetration depths are not determined the text NODT appears in the corresponding fields A NODET value is also reported in...

Страница 35: ...er beam in cloud layer 1 CPD NOTE Extended to 5 digits 55 3B HEX 56 60 Penetration depth of the laser beam in cloud layer 2 CPD NOTE Extended to 5 digits 61 3B HEX 62 66 Penetration depth of the laser...

Страница 36: ...50 Standard deviation vertical visibility VOE 151 3B HEX 152 155 Software version FPGA 156 3B HEX 157 160 Software version for signal processing OMAP 161 3B HEX 162 163 System status OK or ER 164 3B H...

Страница 37: ...ensor The measured values are displayed in Kelvin x 10 Error tolerance 2 K Detector temperature Measured temperature at the sensor The measured values are displayed in Kelvin x 10 Error tolerance 2 K...

Страница 38: ...2 CR 0D HEX eeee 1 LF 0A HEX eeee EOT 04 HEX Table 12 Raw data telegram format any character The lines with the raw data have the following structure according to UUencode standard Line 1 begin 644 Y...

Страница 39: ...fault affected data thus can be inspected and traced back In addition the raw data of a single measurement can be called up as a raw data telegram via the RS485 or LAN interface The operation does no...

Страница 40: ...range_hr Number of points stored in the high resolution NetCDF backscatter profile with a resolution of 5 m 32 layer Number of cloud layers transmitted in telegrams and stored in NetCDF files 3 Table...

Страница 41: ...solution of data range_gate_hr float M Range resolution of high resolution data life_time int time H Laser operating hours error_ext int time 32 bit status code state_laser byte time Percent Laser qua...

Страница 42: ...ter high resolution P_raw_hr lp b cs o r p_cal p_ref l r r c pbl short time layer M Aerosol layers pbs byte time layer Quality score for aerosol layers 1 good 9 bad tcc byte time Total cloud cover bcc...

Страница 43: ...he characters specified in Table 16 Column 2 Which of the respective variants is used depends on the number of digits of the evaluation parameter in the telegram Special value Telegram Description 1 N...

Страница 44: ...rature or laser safety 14 00004000 Error Error Laser power or PIN signal too low or saturated 15 00008000 Warning Warning Replace laser ageing 16 00010000 Warning Unused 17 00020000 Warning Warning Wi...

Страница 45: ...and lifetime of the individual status codes Group Hex code Error description Duration s 1 Configuration xxxx xxx0 Setup works correctly xxxx xxx1 Restart after reboot or firmware restart SW 60 xxxx x...

Страница 46: ...4 Calculation processing in sky condition algorithm xxxx 0xxx Data processing OK xxxx 1xxx Problem in calculating the visual range 60 xxxx 2xxx Problem in calculating of aerosol layers 60 xxxx 3xxx P...

Страница 47: ...r monitor x0xx xxxx Window contamination sensor and laser monitor OK x1xx xxxx Window contaminated 60 x2xx xxxx Laser monitor signal saturated 60 x3xx xxxx Detected laser power not positive resulting...

Страница 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 additionally download NetCDF files co...

Страница 49: ...ystem tab Figure 20 can be changed to easily adjust the color scale The currently detected clouds are updated in the interval dt s and displayed together with aerosol layers and cloud cover in the tab...

Страница 50: ...HM 8k R1 7 01 2020 Communication via RS485 Ethernet 50 Figure 18 Web interface Config Network read only default mode for a device with configured static IP eth0 1 custom Figure 19 Web interface Config...

Страница 51: ...lly installed see 8 8 AFD mode for further information Figure 20 shows the contents of the Config System tab which allows access to parts of the system Figure 20 Web interface Config System upper part...

Страница 52: ...ronization see section 8 7 5 is working The information about the NTP service is only displayed and updated every minute if the NtpMode is active equal to 1 The display of the NTP status see Figure 23...

Страница 53: ...p or errors encountered during configuration with the AFD configuration file can be detected too Figure 23 Web interface Process warnings and error log AFD and NTP status are only visible if AFD NTP m...

Страница 54: ...er mode The configuration file afdsettings must be downloaded configured and uploaded again to accommodate local requirements AFD is preset to transfer three 5 minute NetCDF files every 15 minutes The...

Страница 55: ...via RS485 or in the register Config Network of the web interface refer to Table 4 All user data telegrams described in section 8 3 Data query RS485 can be requested The raw data telegram is still uuen...

Страница 56: ...the command ncrca exe in the Windows command line is restricted by the use of wildcards and the total length of the command line We recommend using git bash for example to circumvent this problem Exa...

Страница 57: ...he instrument is calculated from 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 b...

Страница 58: ...thm now identifies precipitation events and aerosol structures and then calculates the cloud heights and penetration depths Figure 26 Cloud detection algorithm 9 4 Cloud penetration depths Cloud penet...

Страница 59: ...the result Clear sky is correct 9 7 Vertical optical visibility VOR The method for determining the vertical visibility VOR Vertical Optical Range is described in ISO standard 28902 1 2012 The step by...

Страница 60: ...y 50 m 9 Particle layer detected but with low accuracy Table 20 Q Index description of aerosol layer height 9 10 Cloud cover BCC TCC The cloud coverage is determined statistically from the behavior of...

Страница 61: ...10 8 8 okta 10 10 9 Sky obscured by fog or other meteorological phenomena Table 21 Degree of coverage WMO code 2700 and definitions in 10th Figure 28 Degree of coverage algorithm Note The selected ti...

Страница 62: ...treated as a precipitation index Table 22 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 precipit...

Страница 63: ...the lower 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 switche...

Страница 64: ...in the space below 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 3...

Страница 65: ...re against reconnection Table 24 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...

Страница 66: ...ce a year Change the dehumidifier bag CONTAINER DRI II By service staff only Approx every 3 5 years Replace SD card By service staff only Approx every 5 years As a preventive measure Replace the rubbe...

Страница 67: ...vice hardware REV V01 1 New Module for laser status and laser reset Mar 2019 FPGA 4 20 31 10 19 Not suitable for use with device hardware REV V01 1 New Module for laser status and laser reset 2 New Mo...

Страница 68: ...hardware FPGA version dependent handling of laser status messages Nov 2018 1 020 1 Transmission of the automatic telegram via LAN is possible LanTransferMode 1 auto 2 Renaming the setting LanTelegram...

Страница 69: ...Firmware version Description Released 14 Minimal value of RangeDimHr set to 10 1 030 1 040 1 Remove NetCDF files at the end of a month only if zip file was created successfully 2 Bugfix NetCDF creati...

Страница 70: ...re 14 Firefox browser for a connection with the CHM 8k shown here with fixed IP address 24 Figure 15 Web interface 48 Figure 16 Web interface NetCDF files 49 Figure 17 Web interface Viewer 49 Figure 1...

Страница 71: ...ons 38 Table 12 Raw data telegram format any character 38 Table 13 Dimensions in NetCDF 40 Table 14 Global attributes in NetCDF 40 Table 15 Variables in the NetCDF file 43 Table 16 Special values of t...

Страница 72: ...Index of Tables 72...

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