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Dosing pumps means pumps that dose a specific amount with a high accuracy. In many process control scenarios, level gauges or flow meters are used (with low accuracy, at least in some cases), what other strategies are widely used? Sources/Examples would be appreciated.

Edit 2012-07-19
My questions are, what measurements are taken (if any), how are the diverse inexactitudes accounted for and where along the drive train do you control the pump (FI-controlled motors vs. just turning off after Volume X is pumped, for example) I can imagine a lot of ways to do this, but I don't know why one way may be superior to another in a given situation.

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Try search for chemical dosing pump. They are widely used by PCB manufacturers. – EEd Dec 25 '12 at 9:10
related article: Motion Control Requirements for Medical Instruments, Tech Briefs (free-of-charge industry rag), 2011 – Nick Alexeev Jan 12 '15 at 19:40

There are thousands of ways and products to mix fluids and gases , titration pumps, pulse pumps digitally controlled, radial pumps, bubble control pumps for gases & medical, consumer, industrial, military, aerospace for many industries.

Basic designs include;

  1. Rotary pumps => Consumer: Aquarium version shown hereenter image description here

  2. Reciprocating Style Metering Pumps =>

    • displacing a fixed volume through the reciprocating motion using;
    • a piston, a diaphragm, or a bellows
  3. Liquid Diaphragm Pumps ( like those used in fuel pumps )

  4. Diaphragm Liquid Metering Pumps ( discontinuous pulsed operation, including those with magnetic drive)

  5. Electronically Controlled Diaphragm Metering Pump ( more precise with flow sensing )

  6. Pulsed syringe mixer with rate and cc. pulse control

Can you articulate your requirements in more detail? Got Specs?

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I don't believe many medical infusion pumps use any volume or flow feedback. They are built to very tight specs, have very precise instructions for use, and are calibrated. I know this to be the case for the one or two I've had opened up in my hands. I don't know about syringe pumps but I wouldn't be surprised if they had position encoder feedback.

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