Mettler Toledo M300 ISM Specifikace Strana 77

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Transmitter M300 77
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
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 µ 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 µ or m for conductivity. Press [ENTER].
10.4.4 CornerPoints
Enter the low and high corner points in conductivity, pH, dissolved oxygen or dissolved ozone
units and the respective output values from –1 to +1, shown in the figure as –100 to +100%.
Press [ENTER].
10.5 PIDDisplay
(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. If controlling pH, the reagent will also be displayed. 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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