README.html (version 6.0)

INFO-FILE FOR THE METEOROLOGICAL STATION meteoLCD

 

version 6.0  21 April 2018

This file contains all relevant information concerning the meteorological station of the LYCEE CLASSIQUE DIEKIRCH (LCD).

Previous readme.html files are here, here, here, here , here.

Please mail to: francis.massen@education.lu

Main difference w.r. to previous version:

The gas sensors for O3 and NO2 have been replaced by miniature CAIRSENS sensors (sensor O3&NO2 and sensor NO2).


1. Description of the meteorological station (new location since Dec. 17 2004)

Name:
Meteorological Station of the LYCEE CLASSIQUE DIEKIRCH  (meteoLCD)
http://meteo.lcd.lu

Address:

LYCEE CLASSIQUE L-9233 DIEKIRCH (Luxembourg, Europe)
attn: Prof. Francis Massen, Physics Lab. tel: (352) 26807-318  
email: francis.massen@education.lu

Coordinates:
49 degrees 51 min 56 sec Latitude North
6 degrees 9 min 35 sec Longitude East

Altitude:
218 meter above sea-level

Time:
Logger time: UTC , manually synchronized on DCF77 atomic clock
All computers are synchronized to Internet time servers.

Measurement rate:

Typically every minute, with average of 30 minutes stored in logger.

Main Logger:

DL2 datalogger
manufacturer DELTA-T Devices Ltd 128 Low Road, Burwell, GB - Cambridge, CB5 OEJ

 

2. SENSORS (in the order of their appearance in the logger data-files)
     (click channel number link for a picture of the instrument)
   
state: JAN 2004
Channel no. Type Name & Unit Description & manufacturer
61 AN1 AirSpeed [m/s] air speed measured by cup-anemometer accuracy 1%; treshhold 0.2 m/s; digital output; older model; used as spare.
DELTA_T Devices Ltd.
62 RG1 Rainfall    [mm] rain-fall measured by tipping-bucket device 0.2 mm per tip; expressed in mm per half-hour
DELTA_T Devices Ltd.
1 TM1 Logger_T [C] Logger temperature, NTC sensor, serves as a check for critical high internal temperatures
DELTA_T Devices Ltd.
2 TM1 Air_Temp [C] Air_Temperature, PT100 sensor in louvred enclosure, 4-20mA Phoenix Contact amplifier, accuracy 0.1 degrees Celsius
DELTA_T Devices Ltd.
3 %RH Air_Humi  [%] Relative air humidity, resistive sensor in louvred enclosure, accuracy better then 2%
DELTA_T Devices Ltd.
4 AN3 Air_Velo   [m/s] Air speed measured by ultrasonic anemometer; accuracy 0.1 m/s. Former model by THIES Clima has been replaced the 08 July 2013 by a Windsonic model from GILL Instruments Ltd, UK. The accuracy of the Windsonic is 2% at 12 m/s. See picture here.
5 BS4 Air_Pres   [hPa] Local air pressure, NOT REDUCED TO SEA-LEVEL!!! Add ~27.3 HPa to get sea-level barometric pressure, accuracy 1 HPa
DELTA_T Devices Ltd. (Vaisalla)
6 ESR SolarKip [W/m2] Solar radiation (irradiance) in W/m2; SMP10 high precision ventilated pyranometer; 
KIPP & ZONEN
7 UVA UVA_DT [W/m2]
disused! readings not reliable!
Ultraviolet (UV-A region), covering the spectrum from 320 to 400 nm. Output in W/m2. Spectral response curve is bell-shaped (slightly asymetric), with maximum 100% relative sensitivity at 370 nm. Bandwidth at -3db (70% rel.sens.) is from 357nm and 378nm; bandwidth at half maximum (50%) is from 352 to 382nm. Only to be used as spare! Please read separate file UV_AB.html
DELTA_T Devices Ltd.
8 UVB UVB_DT [mW/m2]
removed!
Ultraviolet (UV_B region), covering the spectrum from 280 to 360nm. Output in m W/m2 Spectral response curve is bell-shaped, with maximum 100% relative senssitivity at 313nm. Bandwidth at -3dB (70% rel. sens.) is from 304 to 323nm; bandwidth at half maximum (50%) is from 302 to 327nm (approx.). Only to be used as spare! Please read separate file UV_AB.html
DELTA_T Devices Ltd.
9 UVB UVB_Bio
[mMED/h]
Broadband Solar-Light 501A sensor measuring the effective UVB radiation, expressed in mMED/h 
( milli-Minimal-Erythemal Dose per hour) 1 MED/h = 250 J/(m2*h) = 0.06944 W/m2 effective UVB irradiance This precision broadband instrument is temperature-stabilized at 25 degrees Celsius.
Accuracy: within +/- 5% of daily total. Resolution better than 0.1W/m2. Please read separate file UV_AB.html   
SOLAR LIGHT Co.
10 UVA UVA_Bio
[W/m2]
Ultraviolet Solar-Light 501A-UVA sensor measuring the UVA irradiance in the [320..400nm] wavelength region. Reading is in [W/m2] (Watt per square meters). Construction is similar to the UVB_Bio sensor; the precision broadband sensor is temperature-stabilized at 25 degrees Celsius. Accuracy: within +/- 5% of daily total. Resolution better than 0.1W/m2 Please read separate file UV_AB.html     
SOLAR LIGHT Co.
11 CO2 c(CO2) [ppmV] CO2 concentration of the air, expressed in ppmV (parts per million; 1 volume% = 10000 ppm).
Original Teledyne API E600 sensor replaced on 256 June 2017 by diffusive GMP343 sensor from Vaisala (dual beam NDIR).
12 RAD Gamma  [nSv/h] Ambient air gamma radiation sensor RS03. Accuracy 10% (ca 10 nSv/h for typical ambient dose-rate)
BITT Technology.
13 WV2 Windvane Mechanical windvane. DELTA_T Devices Ltd.
14 (removed) OZO Ozone [ug/m3] Tropospheric ( = ground) ozone concentration in ug/m3 measured by  the old O341M, as the old API Teledyne 400E sensor went defunct.
ENVIRONNEMENT SA.
15 WV2 Wind_Dir [degrees] Ultrasonic Windvane (same device as ch.4); accuracy 1 THIES Clima. Former model by THIES Clima has been replaced the 08 July 2013 by a Windsonic model from GILL Instruments Ltd, UK. The accuracy of the Windsonic is 3 at 12 m/s, resolution is 1.
16 AQ c(NO2) [ug/m3] AQ = Air Quality measured by CAIRSENS =3&NO2 sensor from Environnement SA. No pressure nor temperature correction! UART model with analog 0-5 V used by the logger. 5V = 250 ppb = 500 ug/m3.
ENVIRONNEMENT SA.
17 NO2 c(NO2)   [ug/m3] CAIRSENS =NO2 sensor from Environnement SA. No pressure nor temperature correction! UART model with analog 0-5 V used by the logger. 5V = 250 ppb = 500 ug/m3. [O3] = ch.16 -ch.17.
Attention: Lower limit of detection is about 100 ppb = 20 ug/m3 ! ENVIRONNEMENT SA.
18  UBT UVB_Tin [C] Internal temperature of UVB_Bio sensor. Should be close to 25 degrees C.
19 UAT UVA_Tin [C] Internal temperature of UVA_Bio sensor. Should be close to 25 degrees C.
20 GBT Globe_T [C] Black Globe temperature sensor for the computation of the WBGT (Wet Bulb Globe Temperature = Heatstress-Index) . Installed 02_May_01.
LSI.
21 WBT Wetb_T [C]


 
Wetbulb Pt100 temperature sensor for the computation of the WBGT (LSI, Italy)
Look at picture! The WBGT = 0.7*Wetb_T + 0.2*Globe_:T + 0.1 * Air_Temp
Heavy physical efforts should be avoided if WBGT > 32C (see here!)
LSI.
22 DBT Dryb_T [C] Drybulb (=conventional) Pt100 temperature sensor 
LSI.
23 ESR SolarRad  [W/m2] Solar radiation (irradiance) in W/m2; CM21 high precision ventilated pyranometer (old model that was used previously at channel 6. Replaced by SMP10 the 5th June 2015).
KIPP & ZONEN

Sampling for most sensors : 1 per minute, average over 30 minutes stored.
except: WV2: 1 measure per half-hour


Sensors not read by the Delta_T Logger:

Lightning   Lightning sensor by BOLTEK; software from Aquinosini
DAVIS VANTAGE PRO2 PLUS This is a complete selfcontained backup weatherstation, with temperature, humidity, rainfall, local air pressure, windspeed/direction, solar irradiance and UVB sensors. 
It will be used mainly as a backup in case of dramatic failure of the main station.

 

3. LOGGER DATAFILE FORMAT:

The data-files are self-explaining ASCII files, of the type 'comma and " separated columns'; they may readily be imported into:

Data-files usually cover a whole month, and contain 31*48 + 21 =  1509 lines for 31-days months (header = 21 lines).

Attention: There are several ERROR-FLAGS which may appear BEFORE (NOT AFTER!) the data:


4. Graphs displayed on the Internet (http://meteo.lcd.lu)

The graphs are made using a Linux system (HP thin client with Lubuntu), running GNUPLOT and IMAGE MAGICK and many self-written Perl scripts.
A XPe computer running AUTOMATE 5 Pro makes the transfer from the logger to the Linux computer (transfer 2 times per hour); the Linux computer makes the daily and global files, creates the graphs and icons and transfers everything to the Internet provider.


Last edit: 08 July 2017

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