README.html (version 5.2)

INFO-FILE FOR THE METEOROLOGICAL STATION meteoLCD

 

version 5.2  08 July 2016

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

Please mail to: francis.massen@education.lu


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 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 NOx c(NO2) [ug/m3] NOx concentration in ug/m3 measured by the AC31M sensor of Environnement SA. Recalibrated every 3 to 4 weeks with zero and span gas.
ENVIRONNEMENT SA.
17 NO c(NO)   [ug/m3] NO concentration in ug/m3 measured by the AC31M sensor of Environnement SA. Recalibrated every 3 to 4 weeks with zero and span gas.
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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