Topic: Vantage Vue upgrade

[mauro63]

Hello everyone, I'm Mauro and I write from Montemarciano, a small town north of Ancona, I'm 54 years old, I have the following tools:

Davis VP2 wireless Lawn to 2m in height
Sensors Sensorpush in davis 8 plates radiation shield
Dallas sensors otherwise davis 10 plates radiation shield

I also an Vue iss but, being my poorly ventilated area, in summer suffer a considerable overestimation of the maximum temperatures, so I decided to improve it
following the changes that I run, I hope will be of help to someone

Sorry for my bad english 

first step, I've removed the philips screws of radiation shield and
mounted threaded rods with more lenght



Now I can add more plates to the radiation shield, I've ordered a new radiation shield, add three open plate


in the penultimate dish, I've installed a 25x25mm fan, in extraction, on the last dish a protective grille for insects




Hope you like it


the fan is powered by a little solar panel in daytime mode


 [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]  [ You are not allowed to view attachments ]

[miraculon]

Very nice. I have a similar modification to a VUE thermal shield (actually two of them) in a stack. I used a small Sunon 3V fan in mine and powered it from a Davis solar panel. My application is for the temperature compensation sensor for an ultrasonic snow depth sensor.

http://www.wxforum.net/index.php?topic=24547.msg245391#msg245391

Greg H.

[mauro63]

WOW!! 
wonderful job!

[ValentineWeather]

Nice , great job. 

[alexstaar]

Sweet! Let us know how well it works!

[mauro63]

From today vue with 8 plates and daytime ventilation installed, from tomorrow I will register the extreme values
the height is the same, the exposition is the same, the distance is about 80cm
 

 [ You are not allowed to view attachments ]

[mauro63]

First test
today vp2 high temperature 10,6
vue 10,6

now vp2 4,1
vue 4,0

 

[CW2274]

Do you happen to know what sensor is in the VP2?

[hankster]

What are the specs of that fan?

[mauro63]

What are the specs of that fan?

Yes is the new sensirion sht31

[mauro63]

Do you happen to know what sensor is in the VP2?

Is a 25x25mm, 12volt, 0,06 amp

[CW2274]

I think it will be interesting to see how the SHT31 in a passive shielded VP2 compares with an SHT11 in an aspirated Vue, especially in calmer winds.

[mauro63]

I think it will be interesting to see how the SHT31 in a passive shielded VP2 compares with an SHT11 in an aspirated Vue, especially in calmer winds.

It's what I'm doing, every day from today I will register the difference of min and max and the weather condition
From april probably vue will have his datalogger to have  better analysis
Bye and sorry for my english ;(

[mauro63]

First impression

the 19/02 data

VP2 minimum 3.6
minimum vue 3.4
Maximum VP2 10.6
Maximum vue 10.6
cloudy sky, sunny during the middle, supported ventilation

Today day like yesterday, min temperature lower this morning
VP2 minimum 1.9
minimum vue 1.7
maximum vp2 except retouches 9.7
maximum vue     "              "        9.8

as we can see, resists an underestimate, albeit limited, the overly small screen of minimum night, it is the cause, the 8 flat against the 5 help a little, but not defeated, that gap must bring it to 0!

sunny at the moment and fan of vue that runs smoothly, even the downvolt seems centered, the rotation is minimal, one realizes just approaching his palm grilled to sense the output stream

I forgot the actual data
VP2 9.7 - 82% rh
vue 9.7 - 82% rh

[mauro63]

Can you see the difference ? 
https://www.youtube.com/watch?v=poquwSffzxo

[CW2274]

Well you can certainly see the VP2 cups continuing to spin when the Vue quits. 

[mauro63]

Well you can certainly see the VP2 cups continuing to spin when the Vue quits. 

right! the same position, the same height, I am filming behind the station, the performance of the vp2 anemometer are certainly better
I'm thinking that the quality/price of davis vue is not so good as the vp2 

[CW2274]

Well you can certainly see the VP2 cups continuing to spin when the Vue quits. 

I'm thinking that the quality/price of davis vue is not so good as the vp2 

The VP2 is their "flagship", but still surprised, the Vue is a quality station too.

[alexstaar]

That's certainly an interesting comparison! I suspect the Vue anemometer cups have a larger error at low speeds and higher starting speed because the cups sit down on the unit instead of "hanging" below the unit. Just my theory...

So far the temp comparison seems to be pretty good considering the 2 different sensors. Seems to have been in fair weather so far... Will be interesting to see how the 2 compare in more extreme conditions (hot/cold and/or humid/dry). 

[DC]

Great work mauro63! 

Looks like the temps are very close.

Are you tracking the wind speed data?  Clearly from your video the VP2 seems more accurate, but would be fun to know how much more

[mauro63]

Great work mauro63! 

Looks like the temps are very close.

Are you tracking the wind speed data?  Clearly from your video the VP2 seems more accurate, but would be fun to know how much more

Thanks, I'm glad you like
No, I'm not tracking wind speed data, to have the same esposition of radiation shield I've mounted the vue with windvane point to N instead of S
In video you can see only a simple test for a few second to test the anemometer in correct position, after this test I have turned of 180° the iss to have this result

 [ You are not allowed to view attachments ]

[DC]

Great work mauro63! 

Looks like the temps are very close.

Are you tracking the wind speed data?  Clearly from your video the VP2 seems more accurate, but would be fun to know how much more

Thanks, I'm glad you like
No, I'm not tracking wind speed data, to have the same esposition of radiation shield I've mounted the vue with windvane point to N instead of S
In video you can see only a simple test for a few second to test the anemometer in correct position, after this test I have turned of 180° the iss to have this result

 [ You are not allowed to view attachments ]

I understand and makes sense for your temp comparison testing.  If you ever notice significant wind speed changes (don't care about direction) and have the time/energy/inclination, it would be great to document differences in the speed measurements between the Pro2 and the VUE... you have a great set up for that... we know the Pro2 wind speed specs are better, but quantifying the difference in the real world would be interesting.   

[mauro63]

Great work mauro63! 

Looks like the temps are very close.

Are you tracking the wind speed data?  Clearly from your video the VP2 seems more accurate, but would be fun to know how much more

Thanks, I'm glad you like
No, I'm not tracking wind speed data, to have the same esposition of radiation shield I've mounted the vue with windvane point to N instead of S
In video you can see only a simple test for a few second to test the anemometer in correct position, after this test I have turned of 180° the iss to have this result

 [ You are not allowed to view attachments ]

I understand and makes sense for your temp comparison testing.  If you ever notice significant wind speed changes (don't care about direction) and have the time/energy/inclination, it would be great to document differences in the speed measurements between the Pro2 and the VUE... you have a great set up for that... we know the Pro2 wind speed specs are better, but quantifying the difference in the real world would be interesting.   

I agree, I need to wait a couple of weeks, after that I will probably add the datalogger on vue, so we can have a better comparision about temperature in 24 hours scenario and also have the wind data, keeping in mind regarding the false wind direction.

thanks and forgive me for my terrible english ;(

[mauro63]

Tomorrow I want to remove the wind cups, I want to make sure there are no errors in mechanical designs that can lead to strange phenomena of friction by limiting the start-up threshold
I will keep updated the post 

[mauro63]

This morning I've checked the anemometer cups, no friction, no dirt, there is not nothing that could be reduce the threshold of the anemometer, I've accurately clean again the internal side of base cups, this morning a very little breeze, no difference, the cups of vp2 spin slowly and consolle sign 1,6 km/h, cups vue stuck

Yesterday evening I've connect the vue fan with a 12v battery to check the differences on minimum temperature with ventilation, this morning
minimum vp2 1,7
minimum vue 1,7

Next step, ventilation 24/24