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That's a fine piece of work and ingenuity, Jo. Take my hat off to you, sir. Looks like the heatsink/case combination is living up to expectations. I see that you have siliconed the gap between the sensor frame and chassis and sealed up the sensor at the front. I might look at a gasket of some sort around the sensor frame.
3C above ambient is a very efficient differential for the hot side. 28C differential is very flexible on the cold side, if you intend using temperature control? Consistency between frames makes a big difference. At 28C diff, it should regulate nicely at about 24 - 25C below ambient.
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