Temp controlling a freezer

[konkers]

I agree with spider that the temperature you set won't affect the current draw, just how often the compressor runs. You could always unplug it when you're running your dryer or microwave. The temperature will likely not raise too much before you plug it back in.

As for our weird alcohol laws, they vary state by state. Thankfully in California, where I live, they are pretty sane.

[DonMoleon]

I agree with spider that the temperature you set won't affect the current draw, just how often the compressor runs. You could always unplug it when you're running your dryer or microwave. The temperature will likely not raise too much before you plug it back in.

As for our weird alcohol laws, they vary state by state. Thankfully in California, where I live, they are pretty sane.

My home State, Maine, is also sane when it comes to alcohol laws, except the whole "no drinking and driving" thing...

Thailand has some odd alcohol laws, but they are very relaxed on the "open container" rules that you see in most States. It is totally fine to walk down the street while drinking a beer, or drinking in a car as long as you are not the one driving. That makes sense to me.

[konkers]

I'm not sure you if realize this, but you just made my point exactly...thank you. Like I said, you need to purchase one sophisticated piece of machinery to ferment in celsius to get as accurate as you can with a simple dial on a Johnson Controller in Fahrenheit.

..."If your controller is reading out in whole degrees F (i.e. 67 F not 67.0 F) like the Ranco that MoreBeer! sells, that means that the temperature could be anywhere between 66.5 F and 67.5 F (~19.2 C - ~19.7 C.) Now take the same controller reading 19 C. That could be between 18.5 C and 19.5 C (65.3 F - 67.1 F). The actual difference between those is quite small +-0.5 F vs +-0.9 F"...

...and it's still not as accurate. I close my case your honor.

Ahh quotes taken out of context... My point was that other factors in the system outweigh the difference in *precision* between controlling in C or F. If you care about that level of difference in precision you probably both need to ditch your controller and your freezer/fridge, use a controller with a more sophisticated control algorithm than these bang-bang controllers, and use a cooling system can either cycle fast or apply a variable level of cooling. And even then, after all that work, when you've got your error down to +-0.5F, you probably still won't notice a difference in the final beer as our "imprecise" controller using C with and error of +-2.3F.

As for your Johnson Temperature controller has a fixed differential of 3.5 F (2C). In addition that things entirely analog. It's not controlling based on temperature, it's controlling based off internal voltages in its circuits. The fact that the dial is in F is purely an artifact of the scale that's printed on the dial. You could print a new scale on it in C and it would work EXACTLY the same and control the the same *precision*.

I suppose we'll have to "agree to disagree" here.

[BeaverBarber]

I'm not sure you if realize this, but you just made my point exactly...thank you. Like I said, you need to purchase one sophisticated piece of machinery to ferment in celsius to get as accurate as you can with a simple dial on a Johnson Controller in Fahrenheit.

..."If your controller is reading out in whole degrees F (i.e. 67 F not 67.0 F) like the Ranco that MoreBeer! sells, that means that the temperature could be anywhere between 66.5 F and 67.5 F (~19.2 C - ~19.7 C.) Now take the same controller reading 19 C. That could be between 18.5 C and 19.5 C (65.3 F - 67.1 F). The actual difference between those is quite small +-0.5 F vs +-0.9 F"...

...and it's still not as accurate. I close my case your honor.

Ahh quotes taken out of context... My point was that other factors in the system outweigh the difference in *precision* between controlling in C or F. If you care about that level of difference in precision you probably both need to ditch your controller and your freezer/fridge, use a controller with a more sophisticated control algorithm than these bang-bang controllers, and use a cooling system can either cycle fast or apply a variable level of cooling. And even then, after all that work, when you've got your error down to +-0.5F, you probably still won't notice a difference in the final beer as our "imprecise" controller using C with and error of +-2.3F.

As for your Johnson Temperature controller has a fixed differential of 3.5 F (2C). In addition that things entirely analog. It's not controlling based on temperature, it's controlling based off internal voltages in its circuits. The fact that the dial is in F is purely an artifact of the scale that's printed on the dial. You could print a new scale on it in C and it would work EXACTLY the same and control the the same *precision*.

I suppose we'll have to "agree to disagree" here.

Look. I enjoy autism as much as the next guy, but simply stated...smaller measurements are more accurate measurements. Nothing can change that. It's an irrefutable truth.

[DonMoleon]

Soooo.... anyone see any good movies lately?

[konkers]

Look. I enjoy autism as much as the next guy, but simply stated...smaller measurements are more accurate measurements. Nothing can change that. It's an irrefutable truth.

Ad hominem attacks aside, that's incorrect. Smaller measurements are more PRECISE measurements not more accurate measurements. It's a common mistake to get caught up on increasing precision while ignoring accuracy. Also a common mistake: optimizing one part of a system while ignoring the other dependent parts.

In the small picture, in a system dominated by the measurement capability of your controller, you're right. Measuring in whole degrees C is less precise than measuring in whole degrees F. But in the big picture, it just doesn't matter and it's not worth worrying about. There's a lot more too it than just "Ferment with fahrenheit if possible because it's more accurate than celsius"

Feel free to snip the "you're right" out of the above and consider this a concession.

[BeaverBarber]

Look. I enjoy autism as much as the next guy, but simply stated...smaller measurements are more accurate measurements. Nothing can change that. It's an irrefutable truth.

Ad hominem attacks aside, that's incorrect. Smaller measurements are more PRECISE measurements not more accurate measurements. It's a common mistake to get caught up on increasing precision while ignoring accuracy. Also a common mistake: optimizing one part of a system while ignoring the other dependent parts.

In the small picture, in a system dominated by the measurement capability of your controller, you're right. Measuring in whole degrees C is less precise than measuring in whole degrees F. But in the big picture, it just doesn't matter and it's not worth worrying about. There's a lot more too it than just "Ferment with fahrenheit if possible because it's more accurate than celsius"

Feel free to snip the "you're right" out of the above and consider this a concession.

Are you ok? Did someone forget to oil you today?

[DonMoleon]

I really enjoyed Django Unchained. Probably the best movie I've seen in years...