Author Topic: VP2 anemometer cups sticking  (Read 6925 times)

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Offline piconut

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Re: VP2 anemometer cups sticking
« Reply #50 on: February 20, 2017, 12:25:33 AM »
Cool, those charts are "live"...they've updated.


Holy cow, you're right!  I just copy and pasted the image URL and didn't think about the fact that the image name and path doesn't change and is updated in semi-realtime.  Oh well, I guess that blows my supportive argument. 


Let me know what you determine regarding your wind speeds.
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Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #51 on: March 26, 2017, 10:19:11 AM »
I'm having the same problem. Original anemometer purchased together with ISS in April 2009 worked fine until high winds (55mph) broke the cups in December 2013.

Bought the new reedless anemometer from my UK supplier and it was fine until last September when the cups were reluctant to move in a light breeze. But the next day they were fine and have remained so until today. They do spin but it requires a fair amount of wind to get them to move. The wind vane does more though so I'm concerned that a repair or replacement is needed.

But this kit is very expensive now in the UK and given Davis's reputation for quality I'm a bit annoyed that something like this has only lasted just over 3 years before it starts playing up again.

I'll speak to my UK supplier tomorrow and see if any other UK owners have had similar problems with the new Mk 2 anemometer.
Cheers,
Ray
Cheshire, England

Offline gsfarm

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Re: VP2 anemometer cups sticking
« Reply #52 on: March 26, 2017, 10:31:46 AM »
The replacement part is not expensive, however the shipping can be.
Mine is not the reedless model. It has a magnet on the opposite end of the anemometer cups, pressed onto the shaft. I am unaware of a reedless model, maybe someone can post a link? What sort of sensor would it have? Maybe hall effect?
-G.

Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #53 on: March 26, 2017, 11:42:29 AM »
The replacement part is not expensive, however the shipping can be.
Mine is not the reedless model. It has a magnet on the opposite end of the anemometer cups, pressed onto the shaft. I am unaware of a reedless model, maybe someone can post a link? What sort of sensor would it have? Maybe hall effect?
-G.

I'm hopeful my UK supplier may have some of these in stock especially as he's already chipped in with the discussion. I'll know more tomorrow.

The reedless model has a brass tip on the wind vane. Easily distinguishable.  :grin:
Cheers,
Ray
Cheshire, England

Offline gsfarm

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Re: VP2 anemometer cups sticking
« Reply #54 on: March 27, 2017, 09:29:35 AM »
Ray,
Mine has the brass tip. It's a year and a half old. Maybe it does have another type of sensor but it has the magnet that rotates so the pickup must be an induction coil of some sort to pick up the rotation if it's not a reed switch. I have noticed that when the wind cups turn very slowly (<5kph) sometimes it doesn't read, or shows zero wind. The old VP weather station will read unless the wind cups actually stop; and the old kit uses a reed switch, I recently replaced the switch and wind cups on that unit and it still works great after 10+ years. (Kids knocked over the unit when playing soccer in the back field, breaking the wind cups, anemometer mast bracket, and glass reed switch). This might be an indication that it is something other than a reed switch?

Someone on this forum should know for sure the type of sensor in the new anemometer assembly, would be interested in details.
Here's a picture of bearing with the shaft/magnet in the foreground.

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Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #55 on: March 27, 2017, 06:10:57 PM »
Hi gsfarm,

Thanks for that info. Yours is newer than mine which I can now confirm is in its death throes. Strange really as it came back to life just before midnight last night and all looked well until 10:30 this morning when despite a light breeze the cups failed to rotate except in stronger gusts.

I have spoken to my UK retailer (ProData) and they have asked me to return it to them so they can check it thoroughly and give a report back to Davis. There has to be something fundamentally wrong with its design for it to fail so soon. It didn't even last as long as my Mk 1 anemometer with a reed switch.  :-(

Fortunately I have a spare as part of a Davis spares pack people in the US could buy and a mate who has a relation over there bought two of them. I was wondering how long I would have to wait before it would be needed. It is also the Mk 2 with brass tip.

I'm afraid I'm not technically minded at all so can't really offer an opinion about the design. It would be interesting to run a survey here on how long VP2 owners have had a problem-free anemometer. Certainly where I live in NW England well away from the coast and with a high wind gust of 56mph in 8 years it's not especially hostile to weather stations.

I also think Davis have acknowledged there is a problem with the anemometer by making the replacement cartridge available for around $30. Make that 40 in the UK!

I'm shipping this busted anemometer back to ProData on Wednesday. I'll post their findings here when I have them.
Cheers,
Ray
Cheshire, England

Offline CW2274

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Re: VP2 anemometer cups sticking
« Reply #56 on: March 27, 2017, 06:22:17 PM »
It would be interesting to run a survey here on how long VP2 owners have had a problem-free anemometer..
My first one lasted about 6 years until presumably a large flying creature struck it and smashed the daylights out of it. The replacement, an upgraded one, has been problem free for 4 years, along with the transmitter.
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Offline W3DRM

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Re: VP2 anemometer cups sticking
« Reply #57 on: March 28, 2017, 12:43:18 AM »
My original VP2 anemometer had several failures in the first five years or so of operation. The problems ranged from reed-switch failures to broken cable wiring due to flexing of the solid wire cable. All of the reed-switch problems were rectified by Davis sending me a new anemometer assembly. The last failure was several years ago. Davis then sent me a new-style anemometer that uses the hall-effect sensor rather than the reed-switch. So far, I've had zero anemometer issues since installing the new version.

If anyone has an older anemometer with the reed-switch that fails, I would suggest they not try to repair it but to simply replace it with the new model with the new hall-effect sensor.
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Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #58 on: March 28, 2017, 01:48:25 PM »
Thank you CW2274 and W3DRM. My mate took down the malfunctioning anemometer today and we put the replacement up. On examining the area the cups attach to there is an awful lot of dirt there and some rust. This photo shows the state of it. Bear in mind this is the new reedless anemometer purchased in December 2013 for 180 or around $300.

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For a supposedly improved design something is very wrong. How can that much muck get inside and find its way to the bearings. It has sprung back into life on two occasions in the last 72 hours suggesting if it's cleaned and somehow sealed I should have many more years service from it.

I only hope the replacement put up today has a better sealing system than the one it replaced.
Cheers,
Ray
Cheshire, England

Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #59 on: April 03, 2017, 11:41:55 AM »
My anemometer is now back with ProData in England. They have examined it and will be replacing the wind cartridge free of charge once they have some from Davis. Nice of them and much appreciated.  =D&gt;

Interesting that Davis have now made a replacement cartridge available. Might it mean they have concerns about the design which as you can clearly see allows muck into the assembly causing it to eventually stick. Or just permanently tweaking the design to make it better.  :-) Hopefully this won't happen again and not for many years if it does.
Cheers,
Ray
Cheshire, England

Offline openvista

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Re: VP2 anemometer cups sticking
« Reply #60 on: April 03, 2017, 11:45:17 AM »
What do you mean when you say "the cartridge"? Are you referring to the bearing?
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Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #61 on: April 08, 2017, 10:59:27 AM »
What do you mean when you say "the cartridge"? Are you referring to the bearing?

It's a module that replaces the existing bearing and perhaps something else. My supplier doesn't have any yet so they were short on the detail.

I still get no emails when a reply is posted. Why? I have the option selected and nothing comes through.
Cheers,
Ray
Cheshire, England

Offline pfletch101

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Re: VP2 anemometer cups sticking
« Reply #62 on: April 08, 2017, 04:41:43 PM »

I still get no emails when a reply is posted. Why? I have the option selected and nothing comes through.

The most likely reason is that there is a 'spam trap' somewhere in the server sequence the board's mail server and your client which is discarding these messages. Most ISPs seem to default created mailboxes to use their built-in spam filters. These are very frequently less than optimal (particularly) at telling real spam from wanted auto-notifications and almost always default to discarding (what they believe to be) spam. I recently wasted a huge amount of my and a website ISP support technician's time investigating an auto-notification non-delivery problem that ultimately turned out to have resulted from my cable provider switching their 'spam protection' back on for a mailbox on which I had switched it off for years!
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Offline Ray Proudfoot

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Re: VP2 anemometer cups sticking
« Reply #63 on: April 09, 2017, 03:23:12 AM »
Thanks pfletch. I solved it. I just unsubscribed and then subscribed and that seems to have done the trick. Maybe the option times out if you don't post frequently enough. The posts weren't going to my ISP's spam box. That's the first place I check.
Cheers,
Ray
Cheshire, England

Offline Intheswamp

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Re: VP2 anemometer cups sticking
« Reply #64 on: May 21, 2017, 06:14:52 PM »
Well, my anemometer has been sticking some more so I ordered one of the wind speed cartridges last week.  Ryan (www.scaledinstruments.com) said it'd fix the sticking problem.  The cartridge only works on the new (bell-shaped) anemometers.  While I was at it I ordered one of the new style rain buckets...hourglass-shaped and comes with bird spikes.  They should be here probably Tuesday or Wednesday...I might switch out the bucket but we're predicted to get up to 4" (or more) rain from now through Wednesday so most likely the wind speed cartridge will have to wait to be installed.

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Offline Intheswamp

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Re: VP2 anemometer cups sticking
« Reply #65 on: September 10, 2017, 12:44:18 AM »
Ya'll can all just call me "Speedy".  :-P  I just now have installed the wind speed cartridge (shaft and bearings assembly)...the prospect of Hurricane Irma arriving in two days encouraged me to "get'er done!".  The new cartridge appears to be working well.  Though folks south of me are getting plenty of wind it is rather becalmed around here right now so I haven't seen it clock any high speeds yet.  Tomorrow, and especially Monday, Hurricane Irma should give it a good test. 

As long as you have the allen wrench that came with the station or a set with some *small* ones in it and a medium size phillips screwdriver you have all the tools you need to work on it. Naturally you will need other than the tools to lower the mast with.  Simple repair....even "Speedy" did it.  :-)

Observations:  I found that when I spin the stem of the old cartridge, with nothing attached to it and holding it in my hand, that the shaft/magnet(?) assembly will spin freely but suddenly "hit" something hard causing it to stop spinning.  Sometimes when it "hits" it will bounce back spinning a turn or two in the opposite direction.  It always "hits" when I spin it in the proper direction.  Oddly, when I spin it in the "wrong" direction, opposite of the design of the cups, it spins freely and doesn't "hit".  Also, if I hold on to the shaft and turn it while keeping my fingers on it (not simply free-spinning it) I can feel a rough scrubbing and it will lock up at times in either direction. 

I think something is inside that has "come lose", be it a ball bearing, a chip of metal, or ????, and it spins until that something jams the shaft or one of the bearings.  My old cartridge is not rusty or corroded and other than a small amount of spider web there wasn't any dirt or debris in it...it actually looks good.  It just suddenly stops when it when it "hits" that something.  :-|

The new one seems to be working good, so hopefully it will be good to go for several more years.  The first cartridge lasted just a tad over four years.

I just thought I'd share what I did/found.

Best wishes to all, and to everybody in the path of Irma be safe.
Ed

ETA:  Link to the part needed... https://www.scaledinstruments.com/product/davis-6410-anemometer-for-vantage-pro2-vantage-pro/
« Last Edit: September 10, 2017, 12:58:33 AM by Intheswamp »

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