README.html (version 6.1)INFO-FILE FOR THE METEOROLOGICAL STATION meteoLCD |
version 6.3 29 Oct 2022
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 versions (latest modification first in
list):
29Oct22: New rain-gauge APR314
29Apr22: SMP10 pyranometer replaced by CMP11 (second hand)
Section 2 split into 2a : sensors read by the logger, 2b: sensors not wired to the logger
added PM2.5 and PM10 sensors
The gas sensors for O3 and NO2 have been replaced by miniature CAIRSENS sensors (sensor O3&NO2 and sensor NO2).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
2a. SENSORS read by the datalogger (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 APR314 from EML (replacement of Delta_T sensor, 29Oct2022) |
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 New Fischer pressure sensor. |
6 | ESR | SolarKip [W/m2] | Solar radiation (irradiance) in W/m2; SMP10
high precision ventilated pyranometer; active until Jan22 -->
condensation inside appeared ca. a year ago, not repairable. Replaced by 2nd
hand CMP11 which is mounted in the same ventilation unit. Voltage output
amplified by Vernier instrument amplifier (factor ~150). 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 (removed) | 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 > 32°C (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
2b. Sensors not read by the Delta_T Logger:
Lightning | Lightning sensor by BOLTEK; Astrogenix NEXSTORM software. Old PCI model replaced by LD-350 USB the 22DEC2021 |
DAVIS VANTAGE PRO2 PLUS | This is a complete self-contained 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. |
Fine particles PM2.5 and PM10 | Air Visual Pro (since Dec. 2018): data send to the iQAir
cloud, and collectable from the inbuilt flash memory New model installed in 05MAR21 |
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: 29 Oct 2022