Burkert Type 8619 - Manual (Page 59)

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Adjustmentandcommissioning
PV: Choose the process input from the list displayed by the device. This value may be a measurement input or the
result of the function.
SP TYPE: Choose between an internal setpoint value (choose "internal") or an external setpoint value (choose
"external"; then select the parameter used as the setpoint from the list in the "SP-PV" function below).
SP-PV: Choose the parameter used as the external setpoint for the function.
PV RANGE: Enter the minimum ("PVRange-" ) and maximum ("PVRange+") measurement values of the process
input.
REG TYPE: Choose a linear control mode (choose "linear") or non-linear control mode (choose "non-linear"; then
enter under "Low" and "High" the 2 process input thresholds outside of which the "Drift" part is deactivated).
pH
"High" value
Reagent
"Low" value
Setpoint value
"PID" function
"PI" function (D = 0)
"PI" function (D = 0)
Figure 45 : Example of non-linear control of the pH
CMD DIRECTION: Choose the control direction for the function (CMD1 or CMD2 respectively): ascending
(choose "Rise") or descending (choose "Fall").
0% 100%
100%
Fx / CMD
Output calculated by the function
Rise
Fall
Figure 46 : CMD DIRECTION graphs
Type 8619
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