Manual Ozone Generating System
SMOevo
PLUS
Operation
Manual_SMOevoPLUS_eng_01.2019.doc
page 108 of 179
Calculation
In the calculation, the required ozone mass is divided by the constant setpoint (green). The
result is the variable parameter (gray) that must be set to produce the required ozone mass.
Formula
See calculation basis.
SP
Setpoint in g/Nm³, Nm³/h.
Gray highlighted value = calculated value or correction value
Green highlighted value = default setpoint
PV
Actual value in g/Nm³, Nm³/h, showing the actual Process Value.
•
If too little or too much ozone is required, the variable system
setpoint remains at a fixed minimum or maximum parameter.
Depending on the required ozone mass, the constant
setpoint is automatically corrected to produce the required
ozone mass.
After about 30 seconds, a warning message is displayed in
the HMI:
Warning setpoint corrected due to limits
Ozone Dose Trim (Option)
The correction value of the Ozone Dose results from the Ozone Dose Trim function, based
on the measurement of the process feedback variable. Possible process feedback variables
are dissolved ozone in the water / ozone in the exhaust gas or redox value in the water.
The correction value is determined from the Trim function. Depending on the Setpoint/Actual
value of the given value, the Ozone Dose is corrected upwards or downwards in a specified
range with different increments. (See screen 03.01 Dose Trim Setting).
Example Calculations
Dose Control
Ozone Mass=
Setpoint Dose
[=Setpoint Ozone Dose +/-
correction value Dose Trim (Option)]
* Water Flow
1500 g/h =
1.45 g/m³ [=1.5g/m³ +/-0.0% ]
* 1000 m³/h
1650 g/h =
1.65 g/m³ [=1.5g/m³ +10.0]
* 1000 m³/h