jhcii
New Member
Posts: 40
|
Post by jhcii on Oct 1, 2019 5:01:46 GMT -8
I'm seeing an issue with the placement of my sensor, it's running about 20+ degrees hotter than what the outside temperature should be. I'm using the same type of weather housing on the side to shade it but I'm thinking there isn't enough airflow to give a true accurate outside temperature. I've read where these ( this one looks like the ones I've looked up online ) are weatherproof and can be mounted outside as long as they aren't submersed they will work fine. So is the shield box just to shade the sensor? I think I'm going to modify my setup and mount the sensor out on a board/pole with a solo cup facing downward placing the sensor directly in the center then cutting the cup off so that the metal screen portion of the sensor hangs below the edge of the cup, this would shelter the top part of the sensor - keep most rain off of it - and allow plenty of air flow around the sensor to hopefully get more accurate readings. Right now I can have an outside temp of 94°F but the sensor will read 114°F+, I'll make the modification today and see how the readings go tomorrow.
|
|
jhcii
New Member
Posts: 40
|
Post by jhcii on Oct 1, 2019 14:05:42 GMT -8
Ok I've put my sensor under a cup ( like an umbrella with the sensor as the pole ) mounted on a board just out and away from my station, the temperature so far is more inline with the outside temperature ( only being 2 or 3 degrees different from a digital thermometer I have ) now to wait till the maximum heat of the day tomorrow around noon and see if it stays the same, but it's much better than the 20+ degree difference it was having.
|
|
impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
|
Post by impactoz on Oct 1, 2019 14:56:43 GMT -8
Show a picture or two - might help others.... I am undecided on whether I have a problem similar or not... Just monitoring variances and sun locations and not seeing a pattern as yet!
|
|
|
|
Post by topher2880 on Oct 1, 2019 16:31:56 GMT -8
This isnt mine, but you can use cheap melamine bowls as a stevenson screen fairly easily. Im waiting for a busy friend of mine (hint hint) to print me a small screen as ebay and aliexpress etc dont seem to have many small ones around to buy cheap enough  Even as jhcii suggests, a cup would do. It needs to block direct sunlight, but also not hinder the movement of air. Be mindful of heat off your mounting also. I have my SkyWeather on a huge cement wood shed (former outdoor dunny) and come summertime here in Australia, im going to have heat issues.. so.. going to add a little stand-alone solar powered fan to help circulate air without affecting the readings... i hope |
|
jhcii
New Member
Posts: 40
|
Post by jhcii on Oct 2, 2019 3:31:59 GMT -8
Yeah I took my mounting area into consideration. It's mounted on the backside of my chimney ( not used been converted to gas fireplace but we never use it ) and is about 20 feet above that in order to get it about 15 feet above the roof ridge. So it's a good 30 feet in the air where that shouldn't affect it much. I took an old thick 5 gallon paint stirrer (wood ) and drilled a hole just big enough for the sensor to slip through and then wire strapped it into place. Cut the cup so that the bottom of the sensor sticks out below the edge of the cup. So unless it's raining upward or sideways it should stay dry.
|
|
