Sorry to resurrect an old post, but I found your instructions on Make, then the link to Abe's blog, and finally this thread. I thought I'd have a go at what promises to be a very useful piece of equipment, so I ordered the parts and managed to assemble everything according to the above instructions.
The device itself works fine. I placed a half-gallon of water in the basin and filled the liner with a couple gallons of water to test. Initially, I used pass 0039 and setting pt10.0. The PID would raise the water temperature to the set amount (with a slight bit of overheating) and then cycle on and off to maintain that temperature. The problem is that even though the temp is holding at what the RTD says is 40C, when I tried to verify with a candy thermometer, the thermometer read 48C. I double-checked with a roasting thermometer and confirmed 48C. Next, I boiled a pot of water and inserted the RTD, and it only read 83C. So the probe reading is inaccurate and not in a linear manner.
At first, I though I had gotten the wrong probe from Lightobject (mine had a red wire and two blue wires). But reading further through the thread, I found ArnaudForestier's post referencing the same probe. After following the more detailed programming instructions in the response to Arnaud's post, I repeated my temperature tests and got the same results. I'm still learning about controllers and temperature sensors and can't do much more than follow instructions at this point. Can anyone help me troubleshoot? Do I have a bad RTD? Do I have this wired wrong?
Any help would be much appreciated.