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Weather Station Hardware => Davis Instruments Weather Stations => Topic started by: dport on May 18, 2018, 03:06:28 PM
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Hi All,
I have finally taken the plunge and purchased a VP2 with the 24 hour fan (thank you Ryan W at SI!). It will be here next week. I'm spending time at the moment reading the user manual and thinking about where to site (my options are very limited).
I live in the suburbs of Philadelphia and have attached a google maps image of my house/lot. Orientation of the image is correct, north is at the top of the picture. The red circle indicates where my current station, Ambient ws-1400, is located. This will be taken down once I put up the Davis. As you can see, I have limited options of where to put the station. I'll probably install where the red circle is, but I want to note that this is up against a 5.5 foot wood fence. My concern is that the wood fence faces southeast and gets sun. This may have an adverse effect on heating as the fan draws up potentially warmer air because of the fence?
My thinking is that maybe I will go against official temperature height guidelines of 5 feet and mount the ISS at 7 feet. This will get me clearance above the fence. I plan to put the anemometer up at least 30 feet.
Any additional comments from anyone? I'd also like to note that I have not yet told my wife about the new Davis (she is already annoyed at the Ambient in the backyard). I just got married 5 months ago...hoping I stay married after this.
Thanks!
Dan
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I like the idea of going higher when in smallish back yard. I had no other option myself in Arizona where I didn't have the luxury of full 1/4 acre back yard. Its most important to have free moving air even if you exceed the 6' maximum recommended.
Airport guideline they mention the free air movement importance and areas that have heavy snowfall may have sensors mounted higher also.
AIRPORT SENSOR: 2.6 TEMPERATURE AND DEW POINT SENSORS.
The temperature and dew point sensors will be mounted so that the aspirator intake is 5 ± 1 feet
(1.5 ± 0.3 meters) above ground level or 2 feet (0.6 meters) above the average maximum snow
depth, whichever is higher. Five feet (1.5 meters) above ground is the preferred height. The sensors
will be protected from radiation from the sun, sky, earth, and any other surrounding objects
but at the same time be adequately ventilated. The sensors will be installed in such a position as
to ensure that measurements are representative of the free air circulating in the locality and not influenced
by artificial conditions, such as large buildings, cooling towers, and expanses of concrete
and tarmac. Any grass and vegetation within 100 feet (30 meters) of the sensor should be clipped
to height of about 10 inches (25 centimeters) or less.
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I like the idea of going higher when in smallish back yard. I had no other option myself in Arizona where I didn't have the luxury of full 1/4 acre back yard. Its most important to have free moving air even if you exceed the 6' maximum recommended.
Airport guideline they mention the free air movement importance and areas that have heavy snowfall may have sensors mounted higher also.
AIRPORT SENSOR: 2.6 TEMPERATURE AND DEW POINT SENSORS.
The temperature and dew point sensors will be mounted so that the aspirator intake is 5 ± 1 feet
(1.5 ± 0.3 meters) above ground level or 2 feet (0.6 meters) above the average maximum snow
depth, whichever is higher. Five feet (1.5 meters) above ground is the preferred height. The sensors
will be protected from radiation from the sun, sky, earth, and any other surrounding objects
but at the same time be adequately ventilated. The sensors will be installed in such a position as
to ensure that measurements are representative of the free air circulating in the locality and not influenced
by artificial conditions, such as large buildings, cooling towers, and expanses of concrete
and tarmac. Any grass and vegetation within 100 feet (30 meters) of the sensor should be clipped
to height of about 10 inches (25 centimeters) or less.
Great, many thanks for the information.
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I guess the ISS siting on a tripod in the middle of the yard is out of the question? :-"
Actually since the fence is wood it shouldn't affect the temp, unless maybe if it's a darker color. The rain however may be a different story if the fence tends to sway/shimmy in stronger wind causing false tips.
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Hi All,
I have finally taken the plunge and purchased a VP2 with the 24 hour fan (thank you Ryan W at SI!). It will be here next week. I'm spending time at the moment reading the user manual and thinking about where to site (my options are very limited).
I live in the suburbs of Philadelphia and have attached a google maps image of my house/lot. Orientation of the image is correct, north is at the top of the picture. The red circle indicates where my current station, Ambient ws-1400, is located. This will be taken down once I put up the Davis. As you can see, I have limited options of where to put the station. I'll probably install where the red circle is, but I want to note that this is up against a 5.5 foot wood fence. My concern is that the wood fence faces southeast and gets sun. This may have an adverse effect on heating as the fan draws up potentially warmer air because of the fence?
My thinking is that maybe I will go against official temperature height guidelines of 5 feet and mount the ISS at 7 feet. This will get me clearance above the fence. I plan to put the anemometer up at least 30 feet.
Any additional comments from anyone? I'd also like to note that I have not yet told my wife about the new Davis (she is already annoyed at the Ambient in the backyard). I just got married 5 months ago...hoping I stay married after this.
Thanks!
Dan
Surely you & she will "weather" this early matrimonial speedbump (wink,wink)!
Also, suggest reading up on "micro-climates." Remember, sometimes (weather?) being "close enough" is OK.
Thanks! Going to break it to her this weekend prior to the arrival of the shipment. Have been 2500 miles away on business all week so will use that as the excuse.
Will look more into micro-climates. I'm at an elevation of just over 400 feet here 10 miles northwest of Philly. Center City Philly is obviously at sea level. I received 55 inches of snow this year, while PHL only had 25. A couple degrees makes all the difference around here. The summer is worse, if I walk a mile down the road to a more populated area without trees, you can literally feel the air get warmer (at night after urban heating has taken effect).
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I guess the ISS siting on a tripod in the middle of the yard is out of the question? :-"
Actually since the fence is wood it shouldn't affect the temp, unless maybe if it's a darker color. The rain however may be a different story if the fence tends to sway/shimmy in stronger wind causing false tips.
Ha, yes it is out of the question. I'm not using the fence right now, but my mount is close. I have a 4x4 and galvanized pole solution at the moment. Actual VP2 would be about 12-15 inches out from the fence. Thinking I want to go above the fence line as well.
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Not attached to the fence is a good thing and putting the top of the rain bucket above the fence line will eliminate any possibility of rain shadowing as well. This should also allow for easy cleaning too when needed. When mounting the ISS, try to get it as level and sturdy as possible, this is for the sake of the tipper accuracy.
Food for thought, if it turns out the bucket is too high for visual inspection without stool, ladder, ect., as mine is, for ease I use a mirror held up to look inside.
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I agree with Valentineweather on this one. You need to be above the fence line if possible.
I'm not a fan of mounting the ISS on rooftops due to radiation effects and being inaccessible for routine maintenance. I would consider mounting the anemometer on the roof if a 30 foot pole with guy wires in the backyard is out :grin:
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I don't believe the fence will have much influence on the thermometer, however the rain bucket needs to be in the clear above it. If you can't get the whole section above the fence, I wouldn't be overly concerned.
Your wife on the other hand, I would not start a marriage by keeping anything from her. You know she doesn't care for what you already have. She could always throw it back at you later on, saying "remember that weather station you bought out there"? hahaha! :D ;)
I would discuss what her opinions are very nicely before you install the Davis. She might not want it in the yard, and may be happier with it on the house.
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5 feet for the Weather station over grass area. You will be fine. Think of it this way, unless you are a squirrel or bird, you live on the ground . Keep the ISS 5 feet and you can maintain it. you will need to periodically clean out the rain bucket, change battery in the ISS and stuff.
I have, on my setup, a similar setup you are talking about. i used a tripod, with the feet held into the ground with 3 foot threaded rods with a nut on the top. It hasn't moved since I put it in in 1993. The anemometer is 30 feet off the ground and has been faithfully behaving since 1993 which is a heck of a long time. Just recently it has stopped moving, I have a pole to tap it with and it moves it, it works for a while and quits. I have theories on that one. What I do know is I can't bring it down to replace it. It is up there. 20 years ago No problem. I would lift the pole out of the tripod, replace things and put it back, but now time has worn me down. So it is up there. I did add a lower anemometer about 10 feet and it works fine.
I suggest in retrospect on your pole, get a telescoping flag pole, something you can lower as you get older to service that unit. If you get the same length of time on your unit as I did on mine, you will be a happy camper.
the wife will learn to be happy and enjoy it. I put a console in the kitchen, the wife checks it daily and often tells me what I already know.
Here is my URL on my setup http://www.desmoinesweather.org/weatherlink/main-station.html (http://www.desmoinesweather.org/weatherlink/main-station.html) if you have questions, ask away
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Great stuff guys. Sounds like the best I can do is use my current location (red circle on above picture) for the new station. I think I will mount the ISS just above the fence line. Still looking to get the anemometer about 30 feet up. So this begs the question, can I do this with my current set up? (see attached). Do I need the guy wires? I wonder how high I can go with the metal pipe without needing wires. The roof is out of the question as I don't want to purchase the wireless anemometer transmitter.
Update: I have told my wife about the VP2. Happy to report that all is well! Though not sure she realizes how big the 6153 is in the flesh. On top of that, I am also not sure if she will let me put guy wires in the backyard.
Notes on the picture: the wood fence looks much darker than it is because it is rain soaked. the tree in the background is NOT as close as it appears.
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Great stuff guys. Sounds like the best I can do is use my current location (red circle on above picture) for the new station. I think I will mount the ISS just above the fence line. Still looking to get the anemometer about 30 feet up. So this begs the question, can I do this with my current set up? (see attached). Do I need the guy wires? I wonder how high I can go with the metal pipe without needing wires. The roof is out of the question as I don't want to purchase the wireless anemometer transmitter.
Update: I have told my wife about the VP2. Happy to report that all is well! Though not sure she realizes how big the 6153 is in the flesh. On top of that, I am also not sure if she will let me put guy wires in the backyard.
Notes on the picture: the wood fence looks much darker than it is because it is rain soaked. the tree in the background is NOT as close as it appears.
My Dad once said, " Are you a man or a mouse?" when asked about me wanting to do something. I replied, ' Squeak, Squeak pass the cheese." Try putting it up and then asking her , 'that wind just isn't being measured. All that expense, you know dear, you couldpaint the pole in a cute pattern.
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My anny is bolted into my cinder block wall with 1 1/4" galvy , about 12' sticks above the wall and shimmy's very slightly in strong wind.
You may not want to spend the money on the remote TX, but it's extremely versatile. BTW, don't leave the coiled wire up top next to the anny, have it down by the ISS, or do like I did and cut off what you don't need, makes for a cleaner look that way too.
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My anny is bolted into my cinder block wall with 1 1/4" galvy , about 12' sticks above the wall and shimmy's very slightly in strong wind.
You may not want to spend the money on the remote TX, but it's extremely versatile. BTW, don't leave the coiled wire up top next to the anny, have it down by the ISS, or do like I did and cut off what you don't need, makes for a cleaner look that way too.
and you have 40 feet of cable
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My anny is bolted into my cinder block wall with 1 1/4" galvy , about 12' sticks above the wall and shimmy's very slightly in strong wind.
You may not want to spend the money on the remote TX, but it's extremely versatile. BTW, don't leave the coiled wire up top next to the anny, have it down by the ISS, or do like I did and cut off what you don't need, makes for a cleaner look that way too.
and you have 40 feet of cable
Which I cut off 30' of.
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I found this, which has some options. Plus the wife can grow flowers on it.
https://www.davisnet.com/enews/e_news_archive/2012-10.php (https://www.davisnet.com/enews/e_news_archive/2012-10.php)
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30' is really high. Single story house average is 15' and getting another 15' will require guy wires or very heavy duty pole, something like the 30' collapsible telepole I have for maintenance.
They are rather expensive and on second thought I really shouldn't of done it, because my location trees are 40-50' so it still isn't accurate with tree foliage. Something to consider when spending money for the anemometer if you can't clear the trees save your money. ;)
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Appreciate the link. I WILL get this thing at least 30 feet in the air. There are a few large trees in the area, but when looking west there is a large clearing. Given the strongest winds come from the west, I think I give myself a good shot at accurate readings if I get it up above the 2 stories houses in my neighborhood. Maybe I could run a cable underground and then up the house to the roof?
That said, I was reading in the VP2 user manual that the longer you extend the anemometer cable the LESS the maximum wind readings could be. I'm not sure I understand the logic with that one though. In the last 5-7 years the Philadelphia area has seen an uptick in hurricane activity. We actually had our first hurricane warning in history a few years back. Winds can exceed 70 mph in these occasions. I certainly don't want to limit max wind recordings because of cable length.
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Maybe I could run a cable underground and then up the house to the roof?
Do you think that's worth the time and trouble vs spending a few extra bucks for the remote TX? Not even close in my book...
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Maybe I could run a cable underground and then up the house to the roof?
Do you think that's worth the time and trouble vs spending a few extra bucks for the remote TX? Not even close in my book...
you guys are a terrible influence. $108 at SI for the transmitter is a great deal for the solution I need. Money really isn't the issue. It's more or less the "scope creep" with this project in conjunction with the fact that my wife thinks I am crazy. Perhaps I set everything up, wait a month, and then buy the transmitter. Spacing the project out may help with wife's viewpoint.
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You just made the argument why you should get the remote TX. Do you think wifey would like her yard dug up and a cable run up the side of her house??
Unless you're putting the anny directly over the ISS, you'll regret not getting it now. Just sayin'....
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You just made the argument why you should get the remote TX. Do you think wifey would like her yard dug up and a cable run up the side of her house??
Unless you're putting the anny directly over the ISS, you'll regret not getting it now. Just sayin'....
Any chance we can get Dr. Phil in the house? Bloody hell, this thing is getting mounted on the roof.
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You diggin' for worms? :-)
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You diggin' for worms? :-)
Clearly some soul searching going on here!
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You diggin' for worms? :-)
Better than feedin'em!
"Yes, officer, he disappeared soon after getting his weather station set up. And yes, those flowers over there really are growing quiet well, aren't they?".....
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I think you should consider putting the VP2 closer to that north corner of the house, and then installing the anemometer on the side of the roof at the peak. You will have a better chance to clear obstructions.
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I think you should consider putting the VP2 closer to that north corner of the house, and then installing the anemometer on the side of the roof at the peak. You will have a better chance to clear obstructions.
That's not a bad idea. I could just buy some extra cable and run it up the house. My concern with that is how much sun is needed to charge the batteries in the VP2. If I put on the north corner of the house, it would really only get sun before noon, and then the shadows from my house would take over.
Edit: I should caveat this. During the summer the north corner of the house would still receive almost full sun throughout the day (if put near the fence). The winter is a different story. Low sun angle here in Dec/Jan would be an issue. I sit right on the 40 degree parallel.
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You diggin' for worms? :-)
Better than feedin'em!
"Yes, officer, he disappeared soon after getting his weather station set up. And yes, those flowers over there really are growing quiet well, aren't they?".....
:lol: Looks like that may come to fruition as he's apparently going to dig, and the wife will be :twisted:.
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I'd also like to note that I have not yet told my wife about the new Davis (she is already annoyed at the Ambient in the backyard). I just got married 5 months ago...hoping I stay married after this.
Have you considered humbly asking her for her advice, about where and how to mount the parts of the VP2? And, of course, give her all of the tradeoffs, etc. etc. And tell her you're doing this because she's annoyed about the Ambient.
[After the first place she tells you to stick it, that could be a helpful conversation]
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I'd also like to note that I have not yet told my wife about the new Davis (she is already annoyed at the Ambient in the backyard). I just got married 5 months ago...hoping I stay married after this.
Have you considered humbly asking her for her advice, about where and how to mount the parts of the VP2? And, of course, give her all of the tradeoffs, etc. etc. And tell her you're doing this because she's annoyed about the Ambient.
[After the first place she tells you to stick it, that could be a helpful conversation]
Yes, great thought, I think we are going to talk things over once the unit arrives here on Thursday. I've told her the dimensions, but I still do not think she is aware of how big this is actually going to look in the yard. Will keep an open mind to things once it arrives.
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Btw, do you play any sports? Football equipment and catcher's equipment (if you play baseball) could come in handy during that conversation. If nothing else, maybe a motorcycle helmet? :lol: Also, do you prefer sardines or viennas? Don't forget the crackers and hot sauce. It all comes in small packages that will fit well in a doghouse.
Short story... Years ago, not long after my wife and I were married, she cooked a roast beef. Well, the meat was a good bit on the "tough" side (not her fault, just a bad cut of meat). Well, look at the roast on the serving platter and did the pulling-the-trigger motion with my finger (the one *not* to use in an airport or school) towards the roast. Instant doghouse and an absence of roast beef in our house for YEARS!!!!! Moral of the story, during the era of newlywed bliss think thrice before making any cute jokes about something that might really matter to your better-half. Just sayin'.....
Btw, we laugh and joke about that instance now...almost 30 years later. But, sometimes I wonder if she mentions it just to remind me to be on good behavior. :grin:
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Most all of us "compromise" a small or large amount in regards to our station's placement. I'm nowhere near 30' tall...most likely around 20'. There's a clump of vitex negundo to the north of my ISS which most likely affects wind readings. Etc.,. What I have, though, is the most precise weather condition monitoring for my location that there is. The airport might have more sophisticated equipment, but it's 8-9 miles from me and most likely didn't record the 1.5" downpour we got a couple of days ago. You will be monitoring *your* environment and even the environment across the street can be much different from yours. Even at 30' high, with all the structures and trees around you your station will still be affected by those buildings...funneled wind blowing between the houses, around corners, over the roofs and trees. Nothing's perfect. But generally you will be inline with most other stations around you...even if you anemometer isn't 30' high or your rain gauge isn't in the optimum location. We can only do what we can do. Do the best we can with the limitations facing us...but don't kill our selves in doing it...if it starts not being fun then you're trying too hard. Though I joke about things, our wives trump any toys or hobbies that we may have. Put her first and the rest settles to their proper levels. Btw, running guy wires is not a proven wife-approved action. ;)
Best wishes,
Ed
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Many thanks for all the advice from you all! Going to talk things over with the wife again once the unit arrives on Thursday. Regardless of anemometer height, guy wires or not, etc; I'm very excited to have a VP2 and the 24 hour fan to boot.
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Keep the ISS in the sun and as far away from the house and away from,and above, the fence as possible.
Anemometer can go on the roof. However you will need the transmitter. Have fun! :-)
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Good point about keeping ISS shelter in full sun best as possible. (Something that doesn't get mentioned enough). Unavoidable for many of use during parts of day depending on tree coverage at site.
When shelter is shaded you will be abnormally low during those shaded periods, I've seen as much as 3 degrees F between shaded and unshaded shelter at my place where I have 3 different aspirated stations spread out.
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Update: I have received and installed my 6153. See picture. I bolted the main unit to my 4x4 post. Anemometer is only up about 13 feet. Note that this is NOT my final solution. This is just to hold me over until I can get additional necessary materials. Also, I wanted to be able to service the unit easily with any issues during the first week.
I will have to say though that this is a BAD site. Today is partly cloudy day with temps in the upper 80s to low 90s. My sensor has been spiking about 3 degrees when the sun is out in force, even though the 24 hour fan is running hard. The little dirt mound below the ISS is hot to the touch today. Fence is also very warm. I am about 2-3 degrees warmer than other stations close by when the sun is out.
I assume this is a siting issue and not an issue with my temp sensor or something else in the unit.
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I will have to say though that this is a BAD site. Today is partly cloudy day with temps in the upper 80s to low 90s. My sensor has been spiking about 3 degrees when the sun is out in force, even though the 24 hour fan is running hard. The little dirt mound below the ISS is hot to the touch today. Fence is also very warm. I am about 2-3 degrees warmer than other stations close by when the sun is out.
I assume this is a siting issue and not an issue with my temp sensor or something else in the unit.
The fence may be a problem, but doubtful. An aspirated ISS will always be more responsive than a passive one, except when the wind is blowing decently. I think your siting is fine, you're just not used to an SHT31 and a fan. My temp goes up and down like a roller coaster, I'm now used to it.
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I didn't want to spark a controversy but wood fences can generate heat too. Solution would be getting above the hot pockets I went 10' it was my best compromise with limited backyard. I needed step ladder just to reach my ISS at my Arizona home.
I also mounted stand alone rain gauge lower after I learned my attached gauge was inaccurate. Davis rain gauge mounted on top of ISS, is a nightmare to calibrate and keep clean.
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2-3 F difference is not bad at all. I run warmer on all my thermometers than most of my neighboring weather stations just a few blocks away. Some areas are warmer than others, and you will probably be cooler at night, and in the winter you may be colder like I am.
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2-3 F difference is not bad at all.
I agree. Most any time of day I can be 2-3F warmer than my surrounding ASOS's, 2-3F cooler, or obviously the same, and my ISS sitting has no possible "impediments". Nature of the beast.
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2-3 F difference is not bad at all.
I agree. Most any time of day I can be 2-3F warmer than my surrounding ASOS's, 2-3F cooler, or obviously the same, and my ISS sitting has no possible "impediments". Nature of the beast.
So this is really interesting. Can you explain why?
When I think about it, I'm in an neighborhood that is in between urban and suburban. Philly airport is 9 miles away and in an open area. I can see how on stagnant, hot days that the air in my neighborhood may heat up easier than open areas. Also, there are a TON of big trees in my township. I suspect most folks have their weather stations in the shade most of the day. Mine is in full sun until almost 7 PM this time of year.
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2-3 F difference is not bad at all.
I agree. Most any time of day I can be 2-3F warmer than my surrounding ASOS's, 2-3F cooler, or obviously the same, and my ISS sitting has no possible "impediments". Nature of the beast.
So this is really interesting. Can you explain why?
Mine is in full sun until almost 7 PM this time of year.
I'm in Tucson and my ISS is never shaded, it's exposed sunup til sundown, all year. The 24hr VP2 ISS radiation shield is one of the best in the business, as long as a fan is running in it. If you want to do comparisons, I suggest you do it with the ASOS's near you (I never use other PWS's, you never really know what your getting), and watch the nuances between them all. Be aware though, ASOS's use an averaging algorithm so temp spikes are non-existent, whereas your VP2 (read all PWS's) are raw readings.
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2-3 F difference is not bad at all.
I agree. Most any time of day I can be 2-3F warmer than my surrounding ASOS's, 2-3F cooler, or obviously the same, and my ISS sitting has no possible "impediments". Nature of the beast.
So this is really interesting. Can you explain why?
Mine is in full sun until almost 7 PM this time of year.
I'm in Tucson and my ISS is never shaded, it's exposed sunup til sundown, all year. The 24hr VP2 ISS radiation shield is one of the best in the business, as long as a fan is running in it. If you want to do comparisons, I suggest you do it with the ASOS's near you (I never use other PWS's, you never really know what your getting), and watch the nuances between them all. Be aware though, ASOS's use an averaging algorithm so temp spikes are non-existent, whereas your VP2 (read all PWS's) are raw readings.
Good to know. Apparently I have some reading to do. The temp sensor is very sensitive. Def not used to it. Wanted to make sure that there was no way that the unit was damaged in shipping or when I was mounting it. It did take a 6 inch fall when I was trying to mount it. Suppose that would have zero effect on the temp calibration.
Edit, and yes, I can hear the fan running constantly in the unit.
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I will have to say though that this is a BAD site. Today is partly cloudy day with temps in the upper 80s to low 90s. My sensor has been spiking about 3 degrees when the sun is out in force, even though the 24 hour fan is running hard. The little dirt mound below the ISS is hot to the touch today. Fence is also very warm. I am about 2-3 degrees warmer than other stations close by when the sun is out.
I assume this is a siting issue and not an issue with my temp sensor or something else in the unit.
The fence may be a problem, but doubtful. An aspirated ISS will always be more responsive than a passive one, except when the wind is blowing decently. I think your siting is fine, you're just not used to an SHT31 and a fan. My temp goes up and down like a roller coaster, I'm now used to it.
Not to get too off-topic, but sometimes I wish I lived in a hot dry climate to really see the 31 in action. Lately the airmass here has been tropical so I've been getting SHT15-like movements in temps; kinda boring. Dp's in the low 70s for the most part during the day doesn't exactly spell roller coaster readings.
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I will have to say though that this is a BAD site. Today is partly cloudy day with temps in the upper 80s to low 90s. My sensor has been spiking about 3 degrees when the sun is out in force, even though the 24 hour fan is running hard. The little dirt mound below the ISS is hot to the touch today. Fence is also very warm. I am about 2-3 degrees warmer than other stations close by when the sun is out.
I assume this is a siting issue and not an issue with my temp sensor or something else in the unit.
The fence may be a problem, but doubtful. An aspirated ISS will always be more responsive than a passive one, except when the wind is blowing decently. I think your siting is fine, you're just not used to an SHT31 and a fan. My temp goes up and down like a roller coaster, I'm now used to it.
Dp's in the low 70s for the most part during the day doesn't exactly spell roller coaster readings.
Ha, no it doesn't, just makes you sweaty. My diurnal swing this time of year is usually about 40F. What's yours, 8F? :-)
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I will have to say though that this is a BAD site. Today is partly cloudy day with temps in the upper 80s to low 90s. My sensor has been spiking about 3 degrees when the sun is out in force, even though the 24 hour fan is running hard. The little dirt mound below the ISS is hot to the touch today. Fence is also very warm. I am about 2-3 degrees warmer than other stations close by when the sun is out.
I assume this is a siting issue and not an issue with my temp sensor or something else in the unit.
The fence may be a problem, but doubtful. An aspirated ISS will always be more responsive than a passive one, except when the wind is blowing decently. I think your siting is fine, you're just not used to an SHT31 and a fan. My temp goes up and down like a roller coaster, I'm now used to it.
Dp's in the low 70s for the most part during the day doesn't exactly spell roller coaster readings.
Ha, no it doesn't, just makes you sweaty. My diurnal swing this time of year is usually about 40F. What's yours, 8F? :-)
HA! Well you're not very far off; it's been around 15F, give or take some. Add to that the fact that I have gotten skipped (rain-wise) for the most part this month and it spells a bore fest.
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Suppose this should probably be a separate topic, but I'll ask here since we've been back and forth about my new station.
Like i said in a previous post, i actually dropped the ISS about 6 inches on to straight concrete (the anemometer was not in play). It swung around the pole i was mounting it to and the big white ring that holds the 24 hour fan took the brunt. I actually snapped two of the standoffs (the nut couplings above the fan) in half. I needed to order replacements from Ryan.
Shockingly, nothing else appeared to be damaged. Not even a scratch on any parts of the rad shield. Everything appears to be reporting normally. The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
The rain tipper appears to function just fine. I didnt notice any physical damage.
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The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
I would think doubtfully. I'd certainly watch it before I bought anything though, or get another SHT31 as a spare. My spare's in use now.
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100% Arid-zona sunshine exposure here, too:
(http://static.flickr.com/1489/25730864453_0eea7460a3.jpg)
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Very nice that's the one thing I don't have, full daytime sun exposure in town station.
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sort of related, make sure that you can maintain your ISS as it looks like when the wind does decide to blow, the unit will get some sand,dirt debris in the rain cone as well as the radiation shield. You want it at a level that you can easily maintain it, that is take off the rain cone periodically and clean out the dirt that will go in and occasionally wipe off the radiation shield and at least one time a year, take the station down and give the inside of the radiation shield a good cleaning, with canned compressed air.
Recommended for the ISS alone is 5 feet above the surface. The Wind unit can be as tall as you can, it has 40 feet of cable.
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The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
I would think doubtfully. I'd certainly watch it before I bought anything though, or get another SHT31 as a spare. My spare's in use now.
I suppose by watch, you mean watch for any erratic behavior or lack of reporting? I received my new standoff/screw parts last night and opened up the shield. Attached are a couple pictures of the SHT31. I assume this is in the right position? I couldn't find any diagrams online which portrayed the way the sensor is supposed to sit below the fan housing.
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The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
I would think doubtfully. I'd certainly watch it before I bought anything though, or get another SHT31 as a spare. My spare's in use now.
I suppose by watch, you mean watch for any erratic behavior or lack of reporting?
Attached are a couple pictures of the SHT31. I assume this is in the right position?
Yes.
Everything is where it should be.
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The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
I would think doubtfully. I'd certainly watch it before I bought anything though, or get another SHT31 as a spare. My spare's in use now.
I suppose by watch, you mean watch for any erratic behavior or lack of reporting?
Attached are a couple pictures of the SHT31. I assume this is in the right position?
Yes.
Everything is where it should be.
Except for an AC fan. Sorry couldn't resist. Ah, the look inside to the guts of a new weather station (sniffs for that new car smell). Enjoy it!
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The question is, should I be concerned about any calibration issues? Could the rain tipper be thrown off? Should I order a new temp sensor?
I would think doubtfully. I'd certainly watch it before I bought anything though, or get another SHT31 as a spare. My spare's in use now.
I suppose by watch, you mean watch for any erratic behavior or lack of reporting?
Attached are a couple pictures of the SHT31. I assume this is in the right position?
Yes.
Everything is where it should be.
Except for an AC fan. Sorry couldn't resist. Ah, the look inside to the guts of a new weather station (sniffs for that new car smell). Enjoy it!
Ha, I might be there some day with an AC fan. Many thanks for all the help guys.