Specifications

Transmitter M400/2(X)H, M400G/2XH 73

Printed in Switzerland 30 031 683

10.4 Tune parameters

(PATH: MENU / PID Setup / Tune Parameters)

This menu assigns control to a measurement and sets the setpoint, tuning parameters and non-

linear functions of the controller through a series of screens.

10.4.1 PID assignment & tuning

Assign the measurement, a, b, c, or d to be controlled after ”PID on_”. Set the Gain (unitless),

integral or reset time Tr (minutes) and rate or derivative time Td (minutes) needed for control.

Press [ENTER]. Gain, reset and rate are later adjusted by trial and error based on process re-

sponse. Always begin with Td at zero.

10.4.2 Setpoint & deadband

Enter the desired setpoint value and the deadband around the setpoint, where no proportional

control action will take place. Be sure to include the units multiplier u or m for conductivity.

Press [ENTER].

10.4.3 Proportional limits

Enter the low and high proportional limits -the range over which control action is required. Be

sure to include the units multiplier u or m for conductivity. Press [ENTER].

10.4.4 Corner points

Enter the low and high corner points in conductivity, pH, dissolved oxygen units and the respec-

tive output values from -1 to +1, shown in the figure as -100 to +100%. Press [ENTER].