cooler not cooling to -20

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nitesky
Posts: 8
Joined: Thu Mar 22, 2018 8:40 pm

cooler not cooling to -20

Post by nitesky » Sat May 19, 2018 2:09 pm

I have the asi1600mm pro. It's been working fine but I noticed today when I went to shoot some darks that my cooler % in Sequence Gen Pro was showing 100%. I'd never seen it over about 65% that I recall. After taking a short 30 second dark the temp dropped to -19.5 and then to -19.0. The cooler was still running at 100%. This isn't right. It was working nominal the other night imaging.

I can hear the cooling fan at the rear of the camera running. What could be wrong? It was very humid the last two times I've been out but I wouldn't think that would affect the cooling of the sensor.

James

s3igell
Posts: 37
Joined: Mon Apr 10, 2017 12:04 pm

Re: cooler not cooling to -20

Post by s3igell » Sat May 19, 2018 9:07 pm

What was the Ambient Temp while you were running this Imaging Session??

Even the 1600MM-Pro's 2-stage TEC is only capable of -40-45*C Relative cooling.

This means that if the Ambient Temp was anywhere near +20*C (68*F), then your Cooling was performing up to expectations.
And if it was Humid, like you said, then that will also reduce the effectiveness somewhat...
ES AR152 / ES 80ED Apo / Orion 8in f/3.9 / C9.25-SCT / C6-SCT / C10-NGT / AT6RC / Meade 6000 f/7 115mm APO
550D (Modded) / 60D / ASI1600MM-Cool / ASI120MM-S
Dark Skies in SW CO when I can get there, and badly light polluted backyard when I can't...

nitesky
Posts: 8
Joined: Thu Mar 22, 2018 8:40 pm

Re: cooler not cooling to -20

Post by nitesky » Sat May 19, 2018 10:39 pm

The humid conditions I was referring to was on May 13th. Today I was simply trying to create darks at a specific gain in my house. The temperature in the house was likely to be 72f .

So you're saying the TEC cooler only cools -20 below the ambient temperature rather than cooling to an actual temperature of -20? I live where there are many nights where the temps will be 75 - 80f. Kind of makes building a dark library useless unless I'm missing something. I thought this was the purpose of having a temperature controlled/cooled unit?

nitesky
Posts: 8
Joined: Thu Mar 22, 2018 8:40 pm

Re: cooler not cooling to -20

Post by nitesky » Sun May 20, 2018 12:08 am

Did some additional reading on the cooler and believe I understand it now. Newbie, so misunderstood how it cooled.

Thanks for pointing out how it cools.

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