Topic: Barani MS Pro vs SmartCellino radiation shield comparison

[Meteorology fan]

Jasper3012 - it's worth making an additional supply if possible for Davis FARS24H. It's a few minutes work and it will allow you to power the aspiration shield in winter without any problems.

[Jasper3012]

Jasper3012 - it's worth making an additional supply if possible for Davis FARS24H. It's a few minutes work and it will allow you to power the aspiration shield in winter without any problems.

It’s not that simple there as it’s in a field hundreds of metres away from the nearest houses. I’d have to get a large battery and solar panel.

[Meteorology fan]

The option with a large battery is a good one and plugging it into the one place in the cowl where we have space for the batteries. Below are the instructions for the Davis FARS24H, which is what I did at my place and the fan doesn't turn off when there is no power from the batteries.

[Jasper3012]

The option with a large battery is a good one and plugging it into the one place in the cowl where we have space for the batteries. Below are the instructions for the Davis FARS24H, which is what I did at my place and the fan doesn't turn off when there is no power from the batteries.

I’ll probably take care of this next year, in time for next autumn/winter. For now, I’m hoping to get the third sensor and just install the Davis as it is right now, it’ll probably die off at times during the next 5 months but so be it.

[Kallo78]

Since 2:20 pm yesterday in my installation site both sensors (wh31ep) in the MetPro3 (modified version) and in the Siap are without filter.
The main objective is to confirm or not the possible defect of the Pro with low sun.
This morning I can say that the problem was not the Siap with filter that remained wet for a long time but most likely it was the Pro to get more radiation into the sensor chamber.

[Meteorology fan]

When did this modification for the Meteoshield Pro 3 come out?

[Kallo78]

I don’t think it’s an official modification. Mine is a prototype that I have had for some months.
The changes concern the upper part inside to which a moustache has been added.

[Meteorology fan]

It will be interesting to see if this solves the problem of over-temperature when shining from the side. This happens at the least predictable times on the Barani Meteoshield Pro III. J. Barani is probably aware of this flaw.

[Jasper3012]

Data from yesterday, Nov 1st.

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[mauro63]

Mine yesterday data

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M.

[Kallo78]

Since 2:20 pm yesterday in my installation site both sensors (wh31ep) in the MetPro3 (modified version) and in the Siap are without filter.
The main objective is to confirm or not the possible defect of the Pro with low sun.
This morning I can say that the problem was not the Siap with filter that remained wet for a long time but most likely it was the Pro to get more radiation into the sensor chamber.

Report of yesterday

[mauro63]

Mine yesterday data

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M.

[Meteorology fan]

Kallo78 - You can see from your last graph the problem on the Barani Meteoshield Pro III in the morning against the Italian shield.

[Jasper3012]

Data from yesterday, Nov 2nd. There has been no sun here for days with constant low cloud, so very little interesting to see.

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[Kallo78]

Kallo78 - You can see from your last graph the problem on the Barani Meteoshield Pro III in the morning against the Italian shield.

Yes, it can be.
both wh31 ep without filters

[Meteorology fan]

It would be nice to see a comparison of Smart Cellino vs Davis FARS24H and Barani Meteoshield Pro III with the same sensors to see the extent of this problem and how it compares to the vented Smart Cellino.

[tobyportugal]

After EPs without filters and the solar elevation curve that I've been using for a very long time, you're going to tell me that I'm looking for controversy.
But do you think that data from Ecowitt at 5-minute intervals is appropriate for this type of test?
The Ecowitt export gives an uncertainty of up to 8 minutes. H-4‘ -H+4’.
Examples where you can see the lack of consistency.
(Please note that the times are simply +1 or -1 depending on how I connect, my PCs are on Belgian time for my work, Ecowitt local time)
Imagine the result in critical situations, it's a bit of a lottery.
It's up to you.

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[mauro63]

I personally think so, that 5 minutes are enough, it is true that the timing of the transmitters can introduce considerable uncertainty in the update times but from the debug page of a site that monitors my ecowitt data with a frequency of 16 seconds, I have never noticed discrepancies greater than a minute in the updates.

It is very true that, sampling for example at 10 seconds, would allow to have a myriad of data more than the 5 minutes of ecowitt, but since we are talking about complex time constants (sensor + screen) certainly high and not less than 1 minute considering only the t63, I consider the data reliable, I don't think it's useful to have much more data but  affected by errors

If you want to learn more about the topic, I'll leave you a useful link

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M.

[mauro63]

I would like to inform you that, since this morning, in my test station I have prepared a survey of the reflected radiation, given that, although not very important in this period of the year, it will be added to the usual graphs

M.

[tobyportugal]

That's not the problem.
The Ecowitt data are all multiples of 5 minutes, so they are unique and arbitrary.
So a single measurement to cover h-4 to h+4, for the period from 10h01 to 10h09 you have a single measurement.
8 minutes is a long time to wait for a change wind, solar elevation, radiation etc...

[mauro63]

We try to do our best with the tools we have available.
We do not aspire to know the behavior of an SRS in every possible aspect, these are aspects beyond our possibilities but we rely on an average data, I even rely on hourly data, much more indicative in my opinion.

When I can install 0.5mm diameter Netsushin RTD sensors connected to a datalogger with 1 second sampling I will perhaps be able to have a broader vision, but it will always be net of the errors caused by the screen time constant, it remains and cannot be resolved, neither with better tools nor with analysis and post-processing capabilities.

Topic that for me ends here and I return to talk about the comparison in question

M.

[tobyportugal]

I have the same tools as you, except that I use them 100% with local APIs for one minute and an average calculation over 5 minutes.
This gives me a trend line and the ability to see in detail if I have any doubts.
Everyone does what they want.

[mauro63]

I have the same tools as you, except that I use them 100% with local APIs for one minute and an average calculation over 5 minutes.
This gives me a trend line and the ability to see in detail if I have any doubts.
Everyone does what they want.

I congratulate you and, at this point, I invite you to open a post with your comparisons, posting detailed graphs as we are doing, with sacrifice, every day.
Up to now I have not seen anything of this but simple screenshots often without any sense, but perhaps it is due to my limitations.

Obviously use another post, this one concerns the comparisons with the Siap screen

Thanks

M.

[Meteorology fan]

tobyportugal - You have to understand that for me the Ecowitt WH31EP/WH32EP with SHT35 is just a reference sensor, is there any point in checking the PRT readings. I have the PT1000 set up with recording every 1 minute and time synchronisation to 1 second recording. It is apparent that the problem in Barani occurs regardless of sensor type.

I have had dozens of such situations in the Polish climate on Gen III. It's quite difficult to track down for many people.

[mauro63]

My data from yesterday, the reflected radiation graph is unfortunately partial for yesterday since it was installed late in the morning


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M.