asi120mm-s DIY cooling

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Martin_S
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asi120mm-s DIY cooling

Post by Martin_S » Sat Jun 29, 2019 6:23 am

Since I've been doing solar imaging I have noticed that my sensor temperatures in my asi 120 mm-s have risen to over 50 ° C , so I made a DIY cooler.

I'm using a 12703 TEC module @ 5v 1.25 amps 6.25 watts , running it at 12v 3.0amps was not very efficient as the 50mm square heatsink. could not disperse enough heat.

Temperature control was done with a W1209 controller.

I achieved a drop in temperature around 12 ° below ambient inside my study I'm not expecting that sort of cooling out in the sun , but I'll be happy to keep my camera within the recommended operating specifications.

In all this modification took about 3 hours and cost me around $15 AUD using parts purchased on Ebay.


Martin
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H - alpha setup
Lunt LS60THa Tilt-Tuned Solar Telescope, LS50FHa solar filter front-mounted Double stack etalon. 2 x Barlow
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Re: asi120mm-s DIY cooling

Post by marktownley » Sat Jun 29, 2019 8:07 am

That's a nice mod Martin, thanks for sharing.


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Re: asi120mm-s DIY cooling

Post by Martin_S » Sat Jun 29, 2019 12:48 pm

Thanks Mark


H - alpha setup
Lunt LS60THa Tilt-Tuned Solar Telescope, LS50FHa solar filter front-mounted Double stack etalon. 2 x Barlow
Remote etalon and focusing control's ASI290mm Camera

White Light setup
Skywatcher ED72 ,ED100, Homemade solar wedge, IR cut filter, Solar Continuum filter.

Mounts
Skywatcher HEQ5 Pro Mount ..

Darkside setup

Skywatcher ED72 ,ED100, GSO RC6 ,Celestron Nexstar 6SE.

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Re: asi120mm-s DIY cooling

Post by axion » Sat Jul 27, 2019 4:39 pm

that is great! I was thinking about cooling my ASI174MM from the very beginning. The first idea was to use liquid cooling from computer kits... Now I would consider Martin’s idea.

Interesting how it will work under the sun, the working temp of the camera is -5C or lower, but actually without cooling it is close to 40 or higher.

Thank you for sharing!



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Re: asi120mm-s DIY cooling

Post by marktownley » Sat Jul 27, 2019 8:57 pm

Cooling is important. I think it is for every 6-8c increase in temperature noise doubles in a camera. Normally my cameras run at around 40c - last week with our 'heatwave' they were running in excess of 60c and the noise was very apparent.

I strapped a couple of cool packs from the freezer on the camera with rubber bands, which tamed the temperature off; however this is not ideal (think condensation and camera internals).

My experience of the 174 chip is that it is the noisiest chip (camera) I have ever owned.


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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: asi120mm-s DIY cooling

Post by Martin_S » Sun Jul 28, 2019 4:09 am

You could try a beer can cooler, first up as this will keep the direct sun off the camera body. see my last picture, I just cut one down to fit the camera body before the tilt adaptor.


Martin


H - alpha setup
Lunt LS60THa Tilt-Tuned Solar Telescope, LS50FHa solar filter front-mounted Double stack etalon. 2 x Barlow
Remote etalon and focusing control's ASI290mm Camera

White Light setup
Skywatcher ED72 ,ED100, Homemade solar wedge, IR cut filter, Solar Continuum filter.

Mounts
Skywatcher HEQ5 Pro Mount ..

Darkside setup

Skywatcher ED72 ,ED100, GSO RC6 ,Celestron Nexstar 6SE.

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Re: asi120mm-s DIY cooling

Post by Bob Yoesle » Wed Jul 31, 2019 5:47 pm

Did this with my Chameleon a few years back:

https://www.cloudynights.com/topic/3266 ... chameleon/

I would consider active cooling for about any camera employed during the day for solar imaging.


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