Quote Originally Posted by bobwysiwyg View Post
Sounds like the ticket. What PID controller are you using if you don't mind my asking.
I use this controller
http://www.newark.com/omron-industri...vac/dp/58T9504

with this solid state relay so I can have it switches on and off very rapidly

http://www.newark.com/crydom/d2425/s...Crydom_93K7541

I use them only because I have them on hand. A great number of others will work fine. Pricing about the same for simple one. Or you can buy the one that the OP used.