Measure liquid amount from the pump

Other Hardware Science and Measurement
1

What is the best and possibly simplest inexpensive method to measure how much liquid in mL was pumped out of the container?

Liquid has different density e.g milk, water, cleaner, alcohol etc.
System must pump out only specific amount so water flow sensors do not work.
I need a sensor with precise measurements but what sensor?
Anyone could help here?

Thanks for tips and ideas

2

If the amount is regular, you might use a tank with a couple of float switches and a dump valve.

3
  1. assuming it's the same liquid over and over again (for the same system, or you would have serious cleaning issues): calibrate your water flow sensor for the liquid in question.
  2. weigh the container the liquid is poured in, and use that. You know the liquid, so you know the density, so the weight gives you the volume.
4

I forgot to mention the output liquid goes to different containers, jars or soil so I am unable to measure the liquid on the output outlet but in between tubing/piping.

Flow meter had huge error because it sometimes spins just by pushing air and when stops it also rotates not pushing the liquid properly. Maybe some kind of 'in-between' container with weight sensor that closes valve when certain weight is met and pumps out the whole liquid content out of itself....

5

Deous:
some kind of 'in-between' container

which is what I was saying by - "a tank".
The nature of the liquid, and how it gets in or out are all immaterial.

6

Why would you get air in the pumps? With dissimilar liquids (especially including foodstuffs) you normally have to dedicate a pump/hose/etc set to one liquid anyway.

Try out various such flow meters.

Or if the liquids are small volume, use a peristaltic pump.

7

wvmarle:
Why would you get air in the pumps? With dissimilar liquids (especially including foodstuffs) you normally have to dedicate a pump/hose/etc set to one liquid anyway.

Try out various such flow meters.

Or if the liquids are small volume, use a peristaltic pump.

That will be one device design for various liquids.
So many same devices must be make for many pumps.
I will look into peristatic pump and how use it to do precise measuring

8

That's also where calibration comes in play.
Design a system for water, then there's a good chance you can use it with oil provided it's liquid enough, but of course you have to recalibrate for the new liquid. Then that becomes your oil system, etc.

9

Deous:
What is the best and possibly simplest inexpensive method to measure how much liquid in mL was pumped out of the container?

Liquid has different density e.g milk, water, cleaner, alcohol etc.
System must pump out only specific amount so water flow sensors do not work.
I need a sensor with precise measurements but what sensor?
Anyone could help here?

Thanks for tips and ideas

Flow sensors measure volume flow, so why do you think water flow sensors aren't going to work?

10

If you wish to measure milliliters cheaply then the best option may be to use a piston pump or a peristaltic pump. This way the pump can control exactly how much liquid it is pumping (by volume).

If you wish to know the mass of the pumped liquid there are mass flow metres available that can do it. They do not come cheap. This page shows one of the working principles: