Topic: Barani MS Pro vs SmartCellino radiation shield comparison

[mauro63]

In negative temperatures it is not very accurate and its response time is poor with sht35 and pt1000. Ds18b20 is a bad choice and several classes lower than sht35/45. In negative temperatures we have a pronounced non-linear temperature measurement error. I use Wn34d and wn34l at ground, periodically attaching pt1000 and Wn34d is a bad choice due to poor quality ds18b20 sensor.

You have already expressed your opinion but personally, until proven otherwise, I stick to the results I get
You are probably right, after all we are talking about a very low cost sensor and that is also very easy to find in fake products, which does not happen in this case, the ds18b20 used in the wn34 are original Dallas.

At my latitudes, and in our Mediterranean climate, we will have difficulty testing them with extremely negative temperatures, but I can say that I have aligned the wn34 in the range -10/+40, which is sufficient for us, without noticing problems of accuracy and precision exceeding the specifications which, on contrary,  are rather cautious.

Regarding reactivity we record exactly the opposite of what you say.

I would invite you to be more detachable and to avoid continually issuing judgments, in this field judgments do not exist, they only exist in a climate chamber

M.

[Kallo78]

For what I have seen so far, I am very satisfied with the reactivity and precision of the VN34.
Remember that we are doing tests, not measuring for the world meteorological agency.
That said, the reactivity of vn34 is scary especially in the Apogee but also on passive screens. I have had several air changes in the last weeks and my reports are there to prove it.
Clearly before testing I personally aligned it in a closed box with the other wh32/31 and with a PT100A in my possession. For now I am satisfied, knowing that we are talking about a sensor not certainly structured, but that from the first tests is doing its duty.
I have two in test. One inside Apogee and one, since yesterday, inside Siap SC

[mauro63]

And, after all 

None of us expects a wn34 to replace a sensirion, absolutely, it is unthinkable.

However, having a reliable sensor, of sufficiently modest dimensions to be able to be foreseen perhaps in a dual-sensor configuration at least in screens that have enough space, that costs little and that allows to improve the redundancy of your detection system, we see it as a solution that we like, even if others don't like it

Best regards and I apologize for the off topic

M.

[Meteorology fan]

I check WN34D near the ground and here it surprises, but negatively. The cheaper WN34L is better and more precise, and it also responds faster during radiation. PT1000 last time we checked with calibrated PT100 class A under different conditions. Differences in maxima and minima do not exceed 0.03 deg.C. In the range of positive and negative temperatures. A colleague also compared the new Termio 2 Beta and the measurement results were very repeatable. This year they should appear as a version of thermometers for online operation after the cloud: https://termoprodukt.co.uk/Precise-temperature-data-logger-Termio-2

WN34D sometimes underestimates at negative temperatures by 0.5 deg.C or more relative to PT1000.

[mauro63]

I check WN34D near the ground and here it surprises, but negatively. The cheaper WN34L is better and more precise, and it also responds faster during radiation. PT1000 last time we checked with calibrated PT100 class A under different conditions. Differences in maxima and minima do not exceed 0.03 deg.C. In the range of positive and negative temperatures. A colleague also compared the new Termio 2 Beta and the measurement results were very repeatable. This year they should appear as a version of thermometers for online operation after the cloud: https://termoprodukt.co.uk/Precise-temperature-data-logger-Termio-2

WN34D sometimes underestimates at negative temperatures by 0.5 deg.C or more relative to PT1000.

well, send data, graphs, precise comparisons and comparison methodology, words are worthless, we are tired of preachers, commit and post supporting documentation, otherwise no one can take simple personal opinions into consideration

M.

[Meteorology fan]

We did many tests in Poland and in our climate the ds18b20 from Ecowitt did not work. I also uploaded these results from pt1000 and pt100 colleagues and NTC Thermistor and the result was clear. ChatGPt even pointed out why the ds18b20, is not a good solution for precise air temperature measurements. Errors of up to 0.5 degrees at negative temperatures are not uncommon.

[mauro63]

We did many tests in Poland and in our climate the ds18b20 from Ecowitt did not work. I also uploaded these results from pt1000 and pt100 colleagues and NTC Thermistor and the result was clear. ChatGPt even pointed out why the ds18b20, is not a good solution for precise air temperature measurements. Errors of up to 0.5 degrees at negative temperatures are not uncommon.

You don't want to understand, "lot of test in Poland etc etc" are only words, ask them to post the ds18b20 comparison tests here, and with images, graphs and technical info about or please stop


M.

[mauro63]

We did many tests in Poland and in our climate the ds18b20 from Ecowitt did not work. I also uploaded these results from pt1000 and pt100 colleagues and NTC Thermistor and the result was clear. ChatGPt even pointed out why the ds18b20, is not a good solution for precise air temperature measurements. Errors of up to 0.5 degrees at negative temperatures are not uncommon.

and, to definitively close the topic, this post concerns the comparison between pro and siap, if you want open a post on the sensors with all the insights you find useful, it will certamente be appreciated, but not here thanks

M.

[mauro63]

Today's partially data, at 5 minutes

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M.

[Kallo78]

Report from yesterday.
Windy day with strong wind direction and temperature change in the morning

[mauro63]

Yesterday's report,
day with consistent ventilation, and consequent leveling of the data

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M.

[Jasper3012]

SmartCellino had a real struggle this morning. From 9:00 to 11:20, under clear skies and low winter sunshine, it had a frequent error, peaking at 1C. You can see how the dips in wind speed correlate perfectly with the highest error on my graphs here: https://meteo-be.net/nl/grafieken/male-brugge/day

From what I can tell, it seems to struggle quite a bit with winds speeds <2 km/h at 5 m height, with not much of an error at speeds above 3-4 km/h. It's difficult to tell how the Barani MS Pro would have behaved under these conditions. From the data I've seen on this thread, which seems to indicate that the Barani suffers from these conditions more than the SC, I assume the error would have been even greater on the Barani, possibly reaching 2C+. This data by no means shines a poor light on the SC but instead just highlights the limitations of passive shields. Every shield overheats in the sun, it's up to the wind to carry ambient temp air into the shield to stop the heating of the material from affecting the air temp inside the shield, but when that wind goes away, it will naturally start to overheat. The lower the wind speed required to overheat the inside air, the better the (passive) shield.

[Meteorology fan]

Therefore, if you can, it is worth equipping yourself with Apogee TS-100 or MetOne076B, in addition to passive shields.

[Jasper3012]

Therefore, if you can, it is worth equipping yourself with Apogee TS-100 or MetOne076B, in addition to passive shields.

I won't get an Apogee, instead I'll upgrade my Davis FARS with a stronger fan and large battery sometime in 2025.

[mauro63]

SmartCellino had a real struggle this morning. From 9:00 to 11:20, under clear skies and low winter sunshine, it had a frequent error, peaking at 1C. You can see how the dips in wind speed correlate perfectly with the highest error on my graphs here: https://meteo-be.net/nl/grafieken/male-brugge/day

From what I can tell, it seems to struggle quite a bit with winds speeds <2 km/h at 5 m height, with not much of an error at speeds above 3-4 km/h. It's difficult to tell how the Barani MS Pro would have behaved under these conditions. From the data I've seen on this thread, which seems to indicate that the Barani suffers from these conditions more than the SC, I assume the error would have been even greater on the Barani, possibly reaching 2C+. This data by no means shines a poor light on the SC but instead just highlights the limitations of passive shields. Every shield overheats in the sun, it's up to the wind to carry ambient temp air into the shield to stop the heating of the material from affecting the air temp inside the shield, but when that wind goes away, it will naturally start to overheat. The lower the wind speed required to overheat the inside air, the better the (passive) shield.

Thanks Jasper,

Perfect analysis, which highlights a natural and insurmountable limit, in the presence of radiation and with weak ventilation passive screens show their limits, they are greater the less natural ventilation and greater solar radiation.

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Obviously the error is strictly linked to the quality of the screen and the care taken in the design phase

M.

[mauro63]

Yesterday's report

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M.

[Kallo78]

Report of Yesterday. Windy day

[mauro63]

Yesterday's report, another interesting rapid drop in temperature around 9 pm, the details of those minutes and relative average temperatures for the period

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M.

[Kallo78]

Report of Yesterday

[mauro63]

Yesterday's report, another interesting rapid rise in temperature around 10:30 pm with low wind, the details of those minutes and relative average temperatures for the period (higher average temperature = probably better result)

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M.

[Kallo78]

Yesterday’s report. Interesting to see the reaction of the DS sensors in Apogee and Siap to the change of wind (and temperature) or the stopping of the wind itself

[Kallo78]

Report of yesterday
 

[mauro63]

Yesterday's report

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M.

[Kallo78]

Report of Yesterday

[mauro63]

Yesterday's report

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M.