How do you control the dosing of powders?

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Accurate dosing of powdered chemicals into a liquid tank can be achieved through automation and precise control mechanisms. Using a hopper or small tank above the liquid tank allows for effective storage and dispensing of the powder. Operators can input desired quantities into a PLC, which then automates the dosing process. Suggested methods include pelletizing the powder or diluting it with an inert substance to reduce dosing errors. Additionally, utilizing a stepper motor with a screw feed or exploring pharmaceutical-grade equipment like weigh feeders can enhance accuracy in small-scale applications.
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Hello guys. Sorry if this sounds like a stupid question. I have tried searching for a similar application but couldn't find something that fit my requirements.

My design of the machine requires accurate control in dosing of a powdered chemical into my liquid tank.

The powder will be stored in a hopper or a small tank above the liquid tank. I need to dose accurate (well almost accurate) amounts of the powder as per the quantity of liquid in the tank and some other parameters.

The quantity will be decided by the operator and fed into the PLC. Automation should control the dispensing of powder into the tank.

How do I achieve this?
 
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Pelletize your ingredient and dose pellets. Alternatively you could dilute the ingredient with another inert powder so that dosing errors are minimized. Stepper motor controlling a screw feed should be all you need for powdered ingredients. You might look at pharmaceutical type solutions and the equipment they use.
 
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Search weigh feeder. The first hits are for coal at tens of tons per hour, but they are also made for powders in small quantities.
 
Some problems of handling fine powders (your application may require much smaller volumes; hence, different problems):



:cool:

 
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