Liquid Dosing Control Manual
9.17.150 rev A – September 2020
Page
19
of
34
2. Wait until all entrapped gas is flushed out of the system
- Visually check for bubbles downstream of the Liquid Dosing Set
(observed in process, visibile in clear tubing if used, ……)
or
- Monitor the Actual Density reading (mini CORI – parameter 270) until the value is in
range of used liquid and stable over a time of ~ 30 seconds
or
- Monitor the Flow Rate reading (parameter 205 – fMeasure) until the value is stable over a
time of ~ 30 seconds
3. Stop de pump or close the valve
When a pump is used
- Write value 0 to parameter 206 – Flow setpoint
(stop flow)
When a valve is used
- Write value 3 to parameter 12 – Control Mode
(Actuator 0%)
4. Optional steps for actuator – Valve with bleed connection
(i.e. Bronkhorst C2 valve)
-
Ensure the bleed connection or bypass are connected to a suitable container or waste
line
-
Ensure that liquid downstream of the dosing set is properly collected
Start bleeding the valve
- Write value 3 to parameter 12 – Control Mode
(Actuator 0%)
- Open the bleed connection
- Allow the system pressure to flush out all air bubbles
(observed at bleed tube outlet or visibile in clear tubing if used)
Force remaining air out of the valve by opening and closing several times
- Write value 8 to parameter 12 – Control Mode
(Actuator 100%)
- Write value 3 to parameter 12 – Control Mode
(Actuator 0%)
- Write value 0 to parameter 12 – Control Mode
(Restore to previous)
- Repeat 2 ~ 5 times
- Write value 0 to parameter 206 – Flow setpoint
(end with setpoint 0)
- Allow the system pressure to flush out all air bubbles
(observed at bleed tube outlet or visibile in clear tubing if used)
Wrap-up
-
Close the bleed connection
