EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Specifications download pdf (Page 46)

Transmitter Cond/Res 2-Channel M300 46

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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

response.

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 µ or m. 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 µ or m. Press [ENTER].

10.4.4 Corner Points

Enter the low and high corner points in conductivity units and the respective output values

from –1 to +1, shown in the ﬁgure as –100 to +100%.Press [ENTER].

10.5 PID Operation

(PATH: Menu/PID Setup/PID Display Setup)

This screen enables display of PID control status in the normal measurement mode. When PID

Display is selected, the status (Man or Auto) and control output (%) will be displayed on the

bottom line. In addition, for the display to be enabled, a measurement must be assigned under

Tune Parameters and a relay or analog output must be assigned under Mode.

In Manual, the control output may be adjusted with the up and down arrow keys. (The “Info” key

function is not available in Manual.)

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EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Specifications Page 46