okay well....
Here's the catch... I need the response rate to be in the millisecond range... I purchased a PID controller and the reason it will not work for me is that I need it to give
almost realtime feedback to the PWM portion of the circuit so that the temperature is right on regardless of how much heat it being drawn from the heater. The PID controller I have at present has a very slow response cycle. I believe it is 1 second.
A little bit about the element and its application. The heating element is going to be in a chamber, heating the air going through it. The exit temperature needs to be fairly precise +/- 3 degrees.
So... when the temp is set on the controller, regardless of how cold it is or at what speed the air is entering the heater, the exit temperature is quickly detected and the element instantly adjusts as needed to give the desired temp with precision.
Thats what I need...
Im not sure that the controller I have can do this. The manual to it is
here
Its a Toho-TM 002 I believe. Its too slow unless there is another way to use it... I've been trying the SSR output but it is, like i said, too slow for what I need. There is another output labeled EV1 (event 1).. Maybe that has a faster feedback method?
That idea for the micro-controller and the PI filter sound like its what I need.
Can anyone point me into the direction of where I could find a circuit that applies both of those things?
Thanks in for all the help everyone!
Ohh and I am almost certain I will be using a type T thermocouple.
I hear they're more precise than thermistors.