@mauro63 oddly you rate the company Termoprodukt? Have you had anything from them, do you know who uses their sensors and not only in Poland?
PT1000 and PT100 are from the Polish company Jumo. Among other things, Termoprodukt uses PT1000 4-wire and in some PT100 4-wire Class A and B versions from them. All of them are calibrated by the manufacturer, but in Poland we have some Barani shield recorders, many Apogee TS100, Davis FARS24H with PCA calibration and certificate. What is PCA, you can see below, because the calibration certificate from PCA for its PT100 and other temperature measuring instruments also has a Polish meteorological service:
https://www.youtube.com/watch?v=59F2PtFpOg8We used the option of PCA calibration and purchase of such certificates for specific units here. For a single unit such a certificate at 5 points cost us in the region of 50-60 euros and these are instruments calibrated at several points:
https://termoprodukt.com.pl/calibration-certificate-pcaAbout the accuracy from the specifications of Termio 2, DT3 you can see below. I don't know how you can question the accuracy of PT100/PT1000 and PT500 resistance sensors from Termoprodukt, where this is practically the highest accuracy available on the market. Even the Polish meteorological service has a requirement that the PT100 has a maximum temperature measurement error of about 0.1°C over the entire measurement range. I know because I have friends who work there in several positions and I have also seen the provisions of the ToR in meteorological tenders. These were also, among other things, requirements under the AWOS system.
A video of how Termoprodukt loggers work
https://www.youtube.com/watch?v=7-WTmhS4NsAhttps://termoprodukt.co.uk/current-pharmacy-lcd-data-logger-termio-2?search=termio%202https://termoprodukt.com.pl/termometr-lodowkowy-dt-3-z-alarmemPolish pharmaceutical, refrigeration industry uses these products from Termoprodukt, where instruments must be calibrated and accurate, also with PCA certificates. Do you think that such serious areas of the economy would use instruments that are inaccurate and cast doubt on an accredited, state-owned center?
In Poland, Termio recorders from Termoprodukt are also being used in frost heights, mountain frost surveys and other places where high accuracy and fast response times are required.
PCA this is a national accreditation body authorized to accredit conformity assessment bodies under the Law of April 13, 2016 on conformity assessment and market surveillance systems. The above-mentioned company Termoprodukt also calibrates its measuring instruments there.
Well, be a happy owner of Barani Meteoshield Pro. I have three copies of this shields. Both Gen II and Gen III. I have no doubts about the quality of workmanship, but the measurement results from this shield already do. Most of the time you won't see differences in maximum and minimum temperatures. We live in Poland, we have a different climate than you. The Barani company was just unlucky, because their shield was also purchased by a man who worked for several years at weather stations in my country. He gave us on a closed group of meteorology enthusiasts tips on what to check in the Barani shield and when the results on PT100/PT1000 calibrated thermometers and Sensiron SHT35 good grade sensors can be questioned, because the Barani Meteoshield Pro III shield will overheat. Contrary to appearances, this is not such an uncommon phenomenon and occurs frequently in low flow conditions. We notice a large measurement error especially in the morning and afternoon and evening. The smallest at the zenith. Much depends on the strength of the wind on solar days. We have confirmed this on Termio 2 loggers and SHT35 sensors. We have side-by-side comparisons of the same conditions against Davis FARS24H, WMO-compliant frame and Apogee TS100 in different areas of our country.
Don't get me wrong, I'm not pushing for the elimination of passive shielding from temperature and humidity measurements. This is about comparison with active ones, because there are sometimes such conditions depending on the location and climate that the temperature in the shield will not be in equilibrium with the outside temperature. My opinion is that it is the best passive shield on the market, it has a fast response time, but the disadvantages under certain conditions are strongly highlighted and I can't imagine it as the primary measurement shield at WMO-compliant weather stations. After tests by myself, colleagues and a friend who worked for several years on weather stations, we came to this conclusion. However, there will be a detailed comparison about it on this forum, among others.
@mauro63 don't get me wrong, you probably got most of the products for free from Jan Barani therefore you can't say a bad word about the defects of his products. To make you understand what the Barani shield can suffer from you should look at the following materials. Every passive shield suffers from this to varying degrees. Even the professional ones like Barani Meteoshield Pro III and this error can sometimes be surprisingly large:
https://youtu.be/G9xdVQii_YY?si=jNg2a5ZSLf7NK4XcI don't think all Ecowitt products are bad, because there is potential in several of their sensors, but many are underdeveloped. About their ultrasound sensors, this is already a sign not only of the savings made, but also of the lack of knowledge on the part of the engineers.
For my part, I can say that in addition to the Barani Gen III, I concurrently use Davis FARS24H as a comparison with SHT35 and PT1000 in each of the covers.
Colleagues in Poland similarly have Apogee TS100, Davis FARS24H, Barani Gen III and WMO cages. Most of them have more than a year of Barani. I acquired my first Barani cage in 2022, so I have had it for more than 2 years. However, a closed group of meteo enthusiasts in Poland has allowed us to discover many flaws, which the Barani Gen III shield hides and which Jan Barani will certainly not tell you about, or even admit when you show him the evidence. Instead, he prefers to disparage ventilated shields, where he himself created the Barani FARS of questionable effectiveness most likely against the Apogee TS100 and Davis FARS24H.
I am independent, I have contacts with people working at professional stations and at a state research institute. Therefore, marketing in Barani products will not blind me to the truth and reality.
Just so you understand, I'm not punishing here the abandonment of the company's Barani Gen II and III shields, because they are maintenance-free shields, but under certain conditions inaccurate as any passive shield or even Stevenson cage. Hence, it is worth comparing as far as possible and willing to such aspiration shields as Apogee TS100, Met One aspiration shield with code 076B and the good Davis FARS24H shield. The latter was even taken by the Polish meteorological service along with several Davis extended sets. Temperature measurement is complicated and the Barani shield does not always sufficiently protect the sensor from distortion from material overheating on solar days. Maybe in Italy this happens less often, but in Poland it is not so uncommon. In autumn and winter, when there was sunshine, the readings were incredibly inaccurate when operating the sun low above the horizon. Instead of a negative temperature, for example, it showed a slightly positive one, which was confirmed to us by independent sensors in parallel with the PT1000 and SHT35.
On the other hand, there will be another thread on the forum about the detailed disadvantages of the Barani Meteoshield Pro III, so that anyone interested will later find it and draw conclusions for themselves. Jan Barani himself says to compare with other shelters, radiation shields, so we compare and check its promises from product sheets and marketing brochures.
