Hi Guys

Just  up dating my curing oven temp controller to a P I D controller. (Omega CN7823)
One of the functions is auto-tuning
My question is do i have to auto tune the pid every time i turn it on or is it a set up once type of thing !! tried ringing Omega but there tec guys i cant understand them because of there broken english language (other country)

Thanks for reading any help would be greatful