An electronic PI temperature controller has an output p of 12 mA when the set point equals the nominal process temperature. The controller response to step change in the temperature set point of 2.5 mA (equivalent to a change of 5^ˆ˜F) is shown below:

Determine the controller gain K_c (mA/mA) and the integral time, Ï„_I. Is the controller reverse-acting or direct acting?

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t, s P, mA 0- 8.0 0+ 6.7 20 6.0 60 4.7 80 4.0