Topic: Barani MS Pro vs SmartCellino radiation shield comparison

[Jasper3012]

For those curious, this is how high the sensors are placed in both shields. About 10 cm above the bottom plate.

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Hi, can I ask you what sensors they are? DS?

They are NTC thermistors.

[ivano]

For those curious, this is how high the sensors are placed in both shields. About 10 cm above the bottom plate.

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Hi, can I ask you what sensors they are? DS?

They are NTC thermistors.

ah ok, and how do you acquire the data? Sorry for my questions but I'm intrigued

[Jasper3012]

For those curious, this is how high the sensors are placed in both shields. About 10 cm above the bottom plate.

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Hi, can I ask you what sensors they are? DS?

They are NTC thermistors.

ah ok, and how do you acquire the data? Sorry for my questions but I'm intrigued

Via the Sigfox network.

[mauro63]

Yesterday's report

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M.

[mauro63]

Yesterday's report

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M.

[Jasper3012]

This morning, with high pressure giving calm, sunny and frosty weather, I got another opportunity to potentially record the low sun/low wind effect we've been talking about. While nothing interesting was happening during the first 2 hours after sunrise, possibly due to ice on the shields, at 10 AM, the MS did suddenly go 0.3C and then 0.4C higher than the SC for some time. This happened after about 20 min of very low wind (~1 km/h or so at shield height) and with full sunshine, at an angle of about 20°. The ice on the shields had long melted by this point, so the sudden difference in temp between the shields can't be attributed to this. I suspect this was in fact the MS Pro suffering from the low sun/low wind effect, albeit only to a modest degree vs the SC. This is possibly another piece of evidence suggesting that the SC does suffer a bit less from this effect, likely to a more enclosed sensor chamber. Here's the link to the data, so you can see for yourself: https://meteo-be.net/en/charts/male-brugge/last_24h

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[Jasper3012]

Another morning with light wind and sunshine. The temperature evolution was quite interesting, with the Barani going 0.1-0.2C cooler when the dense mist rolled in overnight and then going 0.2-0.4C warmer than the SC when relative humidity dipped below 100% (timing based on nearby stations). To me, this indicates a slight overcooling on the Barani during saturation, later offset due to the onset of the low wind/sun effect.

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[mauro63]

Yesterday's report

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M.

[ivano]

Good morning everyone, I too add myself to this discussion, I have the Siap version with central shaft, I will post my daily report of my comparisons with different types of screens, both ventilated and passive,
this is yesterday's report 03-03-2025

[Jasper3012]

Good morning everyone, I too add myself to this discussion, I have the Siap version with central shaft, I will post my daily report of my comparisons with different types of screens, both ventilated and passive,
this is yesterday's report 03-03-2025

Welcome to the club! Maybe it's a good idea to remove some shields from your reports and only keep the "main" ones like the Siap, Barani, Davis and Apogee? Right now, your report is a bit overwhelming.

[Jasper3012]

Another interesting day with sun and light wind. There seems to be a trend for the low wind/low sun effect not to occur when RH is at 100%, as I've not observed any difference in the past few days in the first few hrs after sunrise with full saturation. When the RH drops below 100% and there is sun and light wind, then I have been seeing a slight overheating of up to 0.4C on the Barani, relative to the SC.

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[Jasper3012]

Temperature/humidity measurement from another one of my stations, 3.5 km away from the test location, also in a SmartCellino shield. You can see that the dewpoint was around 4C and if we assume the dewpoint to be similar at the test location, we can establish that the RH dropped below 100% at ~10:30 AM. Interestingly enough, that's nearly the exact time when there started to be more significant differences between the shields, indicating a likely relationship between RH and the low sun/low wind effect.

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[ivano]

Good morning everyone, I too add myself to this discussion, I have the Siap version with central shaft, I will post my daily report of my comparisons with different types of screens, both ventilated and passive,
this is yesterday's report 03-03-2025

Welcome to the club! Maybe it's a good idea to remove some shields from your reports and only keep the "main" ones like the Siap, Barani, Davis and Apogee? Right now, your report is a bit overwhelming.

jasper in your opinion the barani fars and the metspec rad-14 are secondary screens? the report is that if you scroll you will find the various comparisons between all the screens, if I had room in the workstation I would still add Comet type screens another pro a modified davis 7714, but unfortunately I have to settle for these 

[Jasper3012]

Good morning everyone, I too add myself to this discussion, I have the Siap version with central shaft, I will post my daily report of my comparisons with different types of screens, both ventilated and passive,
this is yesterday's report 03-03-2025

Welcome to the club! Maybe it's a good idea to remove some shields from your reports and only keep the "main" ones like the Siap, Barani, Davis and Apogee? Right now, your report is a bit overwhelming.

jasper in your opinion the barani fars and the metspec rad-14 are secondary screens? the report is that if you scroll you will find the various comparisons between all the screens, if I had room in the workstation I would still add Comet type screens another pro a modified davis 7714, but unfortunately I have to settle for these 

“Secondary” is the wrong word but this thread has mainly been about the SC vs MS Pro, with the Davis mixed in there aswell. I just think your report would be less overwhelming if you excluded one or two more shields.

[Kallo78]

My report of yesterday with interesting behaviors in the morning because of the strong humidity and the different reactivity of the sensors

[Jasper3012]

Another interesting morning with sun and weak winds. This time, the low sun/wind effect occurred much sooner after sunrise than previous times and when I checked the humidity values, the RH likely never reached 100% at shield height, meaning that the effect could occur almost immediately as the sun started shining on the shields. At this point, I think it’s obvious that there’s some sort of link between humidity and the severity of the effect on both shields. The Barani definitely seems to suffer a lot more than the SC with RH <100%. I’ve also noticed the wind doesn’t have to be dead calm for a difference to occur, just like today, where it occurred with gusts over 2 m/s at 5 m height.

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[mauro63]

Yesterday's report, without password because it's rather educational 

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M.

[mauro63]

Some screenshots from yesterday, to note, in the frequent temperature changes the different reaction speed of the DS sensors compared to the Sensirion multiparameters

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M.

[mauro63]

We have revised the structure of the comparison reports, maintaining the main features and the one-minute sampling

A special thanks to Marco, alias Kallo78, for his efforts to standardize the reports, thus facilitating their viewing and related analysis.

As an example, I attach my report from yesterday

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M.

[mauro63]

Yesterday's report

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M.

[Jasper3012]

Comparison over the last ~30 days. Very little differences, besides shortlasting low wind/low sun effects on the Barani.

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[Kallo78]

Unfortunately I can not attach my reports despite the size is around 2.5mb

[mauro63]

Yesterday's report

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M.

[Jasper3012]

Bit of a breakthrough this morning! With light winds, sunshine and RH <100%, the MS Pro shot up to 0.9C warmer than the SC at one point. I suspect the SC itself was also suffering from the same effect but obviously to a much lesser extent than the Barani. Biggest difference I’ve recorded between the two shields so far.

Link to the data, so you can see for yourself: https://meteo-be.net/nl/grafieken/male-brugge/last_24h

[mauro63]

Hello everyone,

too many problems posting reports, it is not possible to attach pdfs of dimensions that do not exceed the maximum dimensions accepted by the forum

Sorry, those who want to request the reports, ask privately

M.