Re: which PID ?
Auber Instruments and Omega are two good retailers for PIDs and SSRs. Several others are sold on ebay. All the relatively cheap controllers function similarly. They really are not very complicated for an oven setup.
You just need to look at your total oven environment before making a decision on which to purchase. Determine your total watt requirement and start from there. Once this number is known then you can determine what size and how many SSRs/contactors will be required. If multiple SSRs or contactors are necessary then determine if one or more PIDs are required. PIDs and SSRs/contactors must be matched for compatibility.
If you post more specific information such as intended oven size, wattage desired, ssr or contactor, etc. then a more specific answer could be provided.
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