The test we're making is to research a phenomenon about magnetic memory. After reading some documents, we think that matter could has memory.Do you mind my asking what it is you're doing that requires such a high degree of precision? And are there existing controllers used to do whatever that is that you can buy, or copy, or reverse-engineer?
In a tape recorder you can write information by an electromagnetic field.
Naturally produced acoustic phenomenon could be also recorded naturally in matter.
We think that maintaining a precise temperature for some hours, in presence of a determined electric field, can erase all information recorded in it.
Thank you very much for your information Ron, as you say, depending the quality of the sensor, the temperature accuracy will be more exactly or not.While thinking about this I agree it would/could go much better if the entire application were explained. However, I'll share this again in a nutshell. Strict tight temperature control is done using what is called a PID (Proportional Integral Derivative) control. You can find an overview here.
Any temperature measurement or control system is only as good as its sensor(s). Earlier I showed why a thermocouple would not be practical for measuring or controlling temperature accurately to an uncertainty of +/- 0.1 degree C. I also touched on control sensor placement. If a thermocouple were to be used it would only be possible to do so at a few temperatures. The thermocouple would need to be calibrated and charted for a few specific temperatures around its working temperature. Not a cheap or inexpensive process and done by a lab.
The uncertainty you want to achieve is a lab grade tolerance. There is no easy way or inexpensive way to achieve it. It is not going to be done using a basic temperature controller, even a basic PID controller. Just to read accurately (sans any control) temperatures with .1 degree C uncertainty you start with units like these. Then you add a Platinum PRT for a sensor. You are at about $3,000 plus USD real quick.
Now if you are absolutely sure you need this uncertainty it doesn't come cheap which is why this would go much better if the ultimate goal were known. I will tell you right now this is not going to happen with the hotplate you originally linked to.
Ron
I'm not going to buy that device at least in a couple of months, but I know it's the best solution. Other solution I'm thinking is to use a variable power supply.
Maybe, it could be possible to determine some equations. I mean, you apply a constant voltage and you vary the current. Then, you read the temperature. The power used would be low, since I want to get a good accuracy and the best readings are below 100ºC. Determining the changes in temperature and the amperage needed to change 0.1ºC, maybe I could calculate how many amperes would be needed to reach a specific temperature in the range of 300ºC. But possibly I would be in the same situation: I would need a high precise regulable amperage power supply to perform that task.
Or I can start with other materials that requires less temperature. It could be another option.
How about this one. Maybe your doing something in a lab that needs more result though? Fluke handheld inferred
FLUKE
FLUKE-566
799
Temp. Range -40D to 1200DF
Focus Spot Size and Distance 1" @ 30"
Accuracy Greater Than32DF +/-2.0DF or +/-1%
Spectral Response 8 to 14 uM
Laser Sighting 1 Dot
Response Time 500 msec
Emissivity Adjustable 0.10 to 1.00
Repeatability +/-0.5%
Display Dot Matrix LCD
Alarm High/Low
Data Logging 20 Points
Data Hold Yes
Max./Min. Plus AVG and Differential
Memory Recall Max/Min/Avg/Dif
Ambient Temp. Range 32D to 122DF
Safety Rating Class II Laser
Trigger Yes
Battery Type AA
Includes Battery, K Type Bead Probe, and Hard Case
Manufacturers Warranty Length 2 Years
Interesting, I will take note.