Calibrating PID's - MYPIN's reading 10degrees different

[micahwitham]

One of my MYPIN TA4's is reading about 8-10 degrees off the actual temperature. Wondering if people have had trouble with these and if there is an "auto calibrate" kind of feature or if there's a way to manually dial them in to the real temp.

 

[iijakii]

http://milantrend.com/TDusermanual.pdf

Range: ±100.Display value
PV = Measured value - PVF

It's actually due to the RTD, not the PID. You'll need a trusted (calibrated) thermometer, then set that PVF to match them up. IE: Thermometer says 154, PID/RTD is showing 160. Set it to -6.

 

[augiedoggy]

^^ does the temp offset move when you swap plugs from pid to rtds?

 

[micahwitham]

I think the problem is my heat exchanger after much racking my brain.
I took the RTDs out of the kettles and turned everything on and let it sit for a while and the 3 MYPINs ended up being within 1 degree of each other. So it's not the probes or the PIDs.

My copper coil doesn't rest on the element but it's pretty darn close. I think that when the wort or the strike water is passing through, and the element is at 100%, it heats up that section of the coil at a much more rapid rate so when the wort/water gets to my probe at the re-entry point of the mash tun, it's 5-10 degress warmer than the probe in the HLT.

Other than that I can't think of anything else that would cause it.



Sent from my iPad using Home Brew

 

[iijakii]

Are you not recirculating/stirring your HLT? They stratify.