ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction page 126

[Control]
Setting the
Function: A monodirectional
decrease measured value).
Application: This affects, for example, a disinfection process, in which chlorine is added to water.
The incoming water has a chlorine concentration of 0 ppm and is to be adjusted to 0.5 ppm by the
addition of sodium-calcium hypochlorite. The addition of sodium-calcium hypochlorite increases the
measured value.
Fig. 85: Control type PID monodirectional, pH-lowering direction
126
[control] operates in only one of two possible directions (increase OR
Positive deviation
Setpoint
Time
Time
Negative control variable
A1470