MFC
Functions
4.
91
Determining the
setpoint trim function
To adjust the control for the setpoint trim function, the Tconst and
Tvar process times must bet entered in the setpoint trim menu.
These times refer to control loop dead times, which on the one
hand are independent of the control variables, and on the other
hand depend proportionally on the control variables.
Tconst
Menu 2
The constant dead time "Tconst" for the setpoint trim is the sum of
the module 2 measurement dead time and possible dosing delays
during the compound-loop-control.
For the calculation, see “Determining combi- control process
times" on page 84.
Tvar
Menu 2
The variable dead time "Tvar" depends on the current flow rate
control variable, the internal diameter of the line and the distance
between where the chlorine is added and the sample water
extracted.
Tvar is entered in the menu for a control variable at 100 % (flow
rate = 100 %).
Tvar determination
procedure
Enter flow rate Wq between 50 % and 100 %.
Set manual dosing rate and start the dead time measurement at
the same time.
Wait until the actual value2 adjusts to the dosing rate and remains
constant.
Stop elapsed measuring time.
Calculate as follows:
Tvar = (measuring time - Tkonst) x 100 % / flow rate Wq %
Содержание WALLACE & TIERNAN MFC
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