| NEWS |
These are the news starting 01 Jan 2012
Click here for the news of the previous years.
| 14 May 12 |
1. Recalibration of gas sensors (R. Tholl and F. Massen) 2. The Davis VantagePro backup station had a loose windvane/anemometer arm. Fixed. Check of windvane shows that true North gave reading of 319° (instead of 360 or 0). I am not sure for haw long this offset has been active. Recalibrated and checked for correct reading of North direction.(09:00) 3. Replaced pump of zone sensor (15:00) 4. Important: We plan to send the UVB sensor (#1894, channel 9) back to Solar Light Co. for recalibration. When off, this sensor will be replaced by #5760 (same type). To make a prior intercomparison between the 2 UVB sensors, the UVA sensor at ch. 10 is temporarily replaced by the UVB sensor #5760. So the UVA plot shows the mMED/h of the sensor #5760 (discard the wrong text saying UVA). This comparison will run for about 4 days. |
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| 06 May 12 | Uploaded Apr12 data to data archive | ||||||||||||||||||||||||
| 04 May 12 |
1. Maintenance by T.S.E 2. Restarted WBGT measurements at 15:30 UTC 3. Installed new NAS server for storing the images of the many computers (disk images used for cloning). |
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24 Apr 12 |
The Radioprotection Office installed a self-contained dual Geiger counter on the meteoLCD terrasse. The device is powered by a solar panel and transmits its readings by GSM phone. It will be used to make an comparison with our radioactivity measurements. If you use the webcam and choose UV_sensors you may see a vertical cylinder right of the UVB (the left-most) sensor. That's the upper part of the Geiger counter. | ||||||||||||||||||||||||
| 01 Apr 12 | Uploaded Mar12 data to data archive | ||||||||||||||||||||||||
| 29 Mar 12 | Recalibration and maintenance. Thorough cleansing of solar sensors and air sample inlet. | ||||||||||||||||||||||||
| 06 Mar 12 | The Luxembourg Radio Station RTL had a interview over phone with German author Fritz Vahrenholt (Die kalte Sonne) and myself. Click here for the first file (in German, wma) and here for the second (in Luxembourgish, wma) | ||||||||||||||||||||||||
| 05 Mar 12 | Maintenance and recalibration (together with Raoul Tholl) | ||||||||||||||||||||||||
| 04 Mar 12 |
1. uploaded Feb12 data to data archive 2. The Delta_T logger does not handle leap years; this has been manually corrected in the feb12.dat file. The logger has been halted, emptied, date reset and restarted. No data will be lost. |
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| 10 Feb 12 |
1. replaced ozone sensor pump by one we (technician J-P. Klein
an myself) have refurbished (all 3 ball bearings replaced). Pump
now runs very smoothly! This home-made repair made us an economy
of over 1200 Euros! 2. Recalibration of AC31 NOx sensor. |
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| 05 Feb 12 |
1.
Uploaded jan12.dat file into data archive. 2. It is a normal situation that there are no moist enthalpy data: moist enthalpy can be computed only for positive air temperatures, and we are in deep in a cold snap! It might seem inelegant that GNUPLOT does not create anything picturesque in that case, but I think you should bear this. |
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| 03 Feb 12 | Maintenance by TSE. The Zero Air generator is still out of order, it was impossible to repair the compressor. The complete module compressor/motor must be replaced. | ||||||||||||||||||||||||
| 13 Jan 12 |
1. The bearing of the O3 sensor pump was nearing death... pump
replaced by a refurbished in stock. Makes also some disquieting
noises, hope the pump will last some time. 2. I made a quick and dirty repair of the zero air LNI generator: as we have not yet a tool small enough to remove the main bearing (tool is ordered), I exchanged the motor against an old one, a leftover from a previous repair, keeping the original compressor head. Seems to be ok (16:30), so I am making the usual calibration of the CO2 sensor. ...well it did not last long: I just was able to finish the CO2 calibration, when the compressor stopped again.! So definitive repair of the zero air generator will be made during the next visit of Envicontrol (26 Jan 2012). |
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| 09 Jan 12 | Partial recalibration and maintenance with colleague Raoul Tholl. The LNI zero air generator has broken down (bad bearing in compressor motor). Repair will not be immediate. This should not have big consequences, as both CO2 and O3 sensors have their own zero air facility. There just should be not people standing near the CO2 sensor, as this instrument must constantly be flushed by CO2 free air (what a bad design by the constructor API Teledyne!) | ||||||||||||||||||||||||
| 08 Jan 12 | TRENDS update nearly finished. NOx data remain to be updated. | ||||||||||||||||||||||||
| 07 Jan 12 | Started work with updating TRENDS section to 2011 data. This is work in progress! | ||||||||||||||||||||||||
| 02 Jan 12 |
1. Uploaded dec11.dat file into data archive 2. Also uploaded 2011.zip = data file containing all months, including meta data 3. And made the traditional 2011_only.xls file with all the data of the year 2011 and the usual statistics. |
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| 01 Jan 12 |
The usual new year problem with the 7 days
graphs.. as the logger file does not contain the year, Gnuplot
gets confused the 1rst week of every new year. This will self
correct the 7th January. Remember that the ultrasonic anemometer is out of action (possibly for a longer time). Take wind velocity from ch. 61 (labeled Airspeed) and add an offset of 0.38 m/s to make readings of this lower mounted cup anemometer comparable to the ultrasonic anemometer at ch. 4 (labeled Air_Velo) Wind direction should be read from ch.13 (labeled Windvane); ch. 15 (labeled WindDir) corresponds to the ultrasonic anemometer, and should also be discarded. So in short, here are the channels from left to right in the data file that should be discarded:
The main reason for keeping the data files unchanged is that a lot of users pick data from these files and rely on a stable format.
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