Control of cumulative traffic
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During batch production, liquid material is added to the tank; addition stops once a volume of, for example, 500 L has been reached. I hope it’s possible to fill it up just like at a gas station: fill it up quickly with, say, 490L at first, then for the last 10L reduce the flow rate by adjusting the valve and add fuel slowly, until 500L is reached when it stops – to ensure accuracy. Is this achievable? How to achieve it?
It is achievable by using a mass flow meter and a two-stage control valve.
This can be achieved, through quantitative control
It’s possible; just select the right flow meter, link it to the control valve, and program it into the DCS
What logic is used to write DCS?
Use PID control, employ a PLC or DCS, or purchase a meter with such functionality for control
It’s just like the barrel-loading mode
There are many methods. The 4-20mA signal from the ultrasonic flow meter can be used to feed into a PLC for calculation and control; the quantitative output from the ultrasonic flow meter can be used to control shutdown; a frequency converter can be used to drive the motor in order to control the flow rate
The simplest approach is to use 1 flow meter along with 1 batch control system; it works on the same principle as a fueling gun, provided that the flow meter is selected appropriately!