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PostPosted: Jan 3rd, '16, 12:23 
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Quote:
signore wrote:
next time I'm there we can put a lead on it and mount it outside the box.

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Thanks Matt.

Quote:
Gunagulla wrote:
I was about to ask about that weird ambient temperature profile! You really need it away from the wall, in open air with a housing similar to a Stephenson Screen to get an accurate air temp reading. You can make a cheap one from 100mm white PVC with plenty of ventilation holes and an air gap at the top under a wide shading lid, making sure the sun cant shine directly on the sensor.

The graphs look great, what logging interval are you using?


Yep,will do. I will have to leave all questions of an IT/Technical nature to Matt to answer :oops: :oops: :oops:

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PostPosted: Jan 3rd, '16, 12:30 
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those stephenson screens look cool. Will have to work out how to build one...

The temps are logged every 5 mins. For the charts they are averaged each hour. The Google Charts Api let's you add a curve between data points making them look smooth.

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PostPosted: Jan 3rd, '16, 12:58 
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The important things you need for a screen are that it is white so that it doesn't get hot in the sun, and lots of air flow, and it doesn't really matter how you achieve them. For the best accuracy, you can have a little solar powered fan to increase air flow over the sensor, although that's probably a bit beyond what is required here.

Can't edit my post, but I should have written Stevenson, no ph.

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PostPosted: Jan 6th, '16, 05:28 
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Gunagulla wrote:
The important things you need for a screen are that it is white so that it doesn't get hot in the sun, and lots of air flow, .


My instant thought is a larger PVC tube and a round computer fan that fits internally, and then a small PV cell to power it in the sunlight, and naturally, painted perhaps chrome to reflect as much insolation as possible.. and orient north south.
Then, I would expand that thought by suggesting a coaxial tube.. thus NO heat from incident sunlight, could affect the sensor, as the fan would be drawing air through both tubes..

Just thinking how difficult it would be manufacturing a Stevenson box... other than buying a stack of cheap stainless mixing bowls and.use spacers to create the effect with the bowl bases cut out (except the top two)....

And.as a PS... re. DRILLING HOLES.. I have fallen in love with Christmas Tree Drills... Taper Drills.. ????
You can buy them sooooo cheaply from China and the do everything you seek.. provided each incremental step is deep enough for the material.. and you can efficiently take the edge off the hole, with the next step..
..


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PostPosted: Jan 6th, '16, 06:24 
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Whatever you do, don't make it out of stainless steel or chromed steel, as both get very hot in the sun and will radiate a lot of heat onto the sensor. White paint is best, on wood or PVC, or other low thermal mass/low emissivity material.

Making a Stevenson screen with louvred wood panels such as this: http://www.bunnings.com.au/haron-265-x- ... t_p0811259 would be simple, but PVC tube would be less expensive.

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PostPosted: Jan 6th, '16, 14:13 
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I really like look of this one


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PostPosted: Jan 31st, '16, 08:32 
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Another job I got started this Xmas was building a tabletop onto the sump tank lids.

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PostPosted: Jan 31st, '16, 08:45 
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Almost done, just need to sand back and stain a few more times but the bloody rain ! I can't seem to get a few clear days to finish it off.
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PostPosted: Jan 31st, '16, 09:13 
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Nice job! what sort of timber did you use?

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PostPosted: Jan 31st, '16, 09:42 
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Thanks, I think its bluegum.

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PostPosted: Jan 31st, '16, 09:51 
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No leaks so far, just looking out for a bit of mini orb steel to make a cover. Cricket,golf,archery etc, all banned in the backyard at the moment.
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PostPosted: Jan 31st, '16, 10:01 
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Silver Perch and Tandanus.
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PostPosted: Feb 2nd, '16, 15:49 
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Lol. Yeah archery would be a bit of a bad pastime in a backyard filled with plastic tanks. :D


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PostPosted: Feb 2nd, '16, 16:04 
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Nice that window.
Is it for you to look in or for the fish to look out? :-)
Are the fish keeping it clean for you?


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PostPosted: Feb 2nd, '16, 17:09 
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Quote:
MartinC wrote:
Lol. Yeah archery would be a bit of a bad pastime in a backyard filled with plastic tanks. :D

Got some steel today from my worksite so will make something up this weekend :thumbright:

Quote:
Wilsil wrote:
Nice that window.
Is it for you to look in or for the fish to look out? :-)
Are the fish keeping it clean for you?

Just for me to look in, but curiosity gets the better of some of the SP and they dart over for a quick look then shoot back over to the other side of the slo. The Tandanus just cruise past from time to time they have really small eyes and I don't think they see anything much. The window gets green algae on the inside, I just reach in and wipe it off with an old towel. Looking forward to next winter and watching those big beautiful rainbows cruising past !

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