... be RTD or thermocouple 2.PID output pt100 temperature sensor controller1. Product HighlightsThermocouple: T, R, J, B, S, K, ... until “AT” indicator blinks, which indicates autotuningis in progress. When auto-tuning finishes, the “AT” indicator light turns off. Now ... 325 deg FPower up the controller and press (>) to activate auto-tuning. When “AT” stops blinking, new PIDparameters are generated ...