Do I Need to Autotune Again - & How do I calibrate the probe?

[whovous]

I have an Auber PID as modified by Brau Supply. After extended use, the wires on the PT100 RTD temp sensor snapped. I got a cheap replacement from eBay.

I have two questions:
1. Do I need to autotune again now that I have a new sensor? The PID held temps pretty well with the prior sensor. I am brewing soon and have little spare time in the interim. I am inclined to assume it will be close enough and to keep an eye on temps. I can switch to manual if the swings are too big. Is this OK, or is a new autotune really important?

2. When I put the new probe in still water it reads 70.5. A laser thermometer reads 68.5. Assuming this means the probe is 2F high (and yes, I know that so assuming is way over-simplifying) how do I tell the PID to take 2F off of all the temps it reads?

 

[RocketBrewer]

Look up the instructions on the Auber site, it will tell you how to correct the temp offset. I wouldn't think autotune would be necessary.

 

[whovous]

My educated guess seemed to work. The old probe had two blue and one red wire. The new has two red and one blue. I put the two red where the two blue were.

The next morning, the probe and my laser thermometer were within 0.1F of each other. I went ahead and brewed, and the PID held temp within about 0.3F. It is nice to finally have this working like it should.