retrolefty:
ScottG:
I'm not getting an error, I'm getting inaccurate temperature readings, mostly in the 30s, when it should be in the 70s.I'm measuring pool water temperature. I chose thermocouples because you can easily buy a thermocouple temperature probe that you can thread into a pipe and has an enclosure at the top for the wiring. And can be outdoors. See attached picture for an example.
Errors of that magnitude could be from improper wiring material. What kind of wire are you using from that TC connection head in that picture to the electronics that reads the TC voltage?
Lefty
I don't think it's the wiring because it works fine with any one thermocouple hooked up. It's only when I have more then one T/C connected that I have a problem. To answer your question, I have the breakout board in the head of the thermocouple connected directly the the T/C probe wires. I have an unshielded 5 conductor 18 gauge stranded cable running between breakout board an Arduino. Cable is about 10 feet long.