Originally Posted by dcarch
The controller shown, I think is just an electronic thermostat. It does not have "PID" features. Using that with a slow cooker, especially without a circulator, you can be having wide temperature swings.
I believe you are correct.
I was getting a 3°C (5.4°F) swing on my build and I had a circulator, I just swapped out the controller for a Farenheit controller hopefully the swing will be less (hoping on 3°F at the most) It's fine for what I am cooking now, but as posted before I have another build in the works.
This is the swing I get on a roaster, I have read Rice Cookers are better, followed by Crock Pots and Roasters are on the bottom of the list, some folks have had success with Coffee Urns as well.
There is a bit of carry over heat from the Roaster once it shuts off, and with these controllers, there's no way to compensate, these controllers may work better with instant on and off devices like an immersion heater, not sure but it makes sense.
The swing never goes below the Low Limit preset, only above, so that's at least a good thing.
A "P.I D." has a pretty cool feature, Auto-Tuning
By simply press a single button the built-in artificial intelligent is activated to automatically calculate and set parameters that fit the condition to be controlled.
Is it worth an extra $15-$20? I think so but I'll let you know for sure in a few weeks.
If all goes well this one will be used for holding foods at parties and events.