How to measure the volume of poured liquid?

Question

Arduino

Good evening.
Faced with the need to accurately measure the volume of pumped fluid.
There are 2 pumps, it is not possible to calibrate them in terms of volume per second.
Gasoline goes one way, oil goes the other way. volumes are small. 2-150gr.
Flow sensor - I think it will not work = aggressive environment.
At the moment I'm using Chinese scales connected to arduino through an amplifier.
I want to get rid of weights. Help me please.

Answer 1

With such volumes, scales are perhaps the best option. Other options are either a dosing pump (again, you still need to look for such small volumes of portions), or a measuring container and count how many times it has been filled / emptied ...

Answer 2

Flow sensor - I think it will not work = aggressive environment.

The industry produces sensors for almost any environment, and gasoline is not a particularly aggressive environment.
There are magneto-inductive and ultrasonic flow sensors, though I'm not sure that they exist for such small volumes - in a reasonable price range.

Answer 3

If all this goes into some kind of container - a level sensor. There are probably flow meters for fuel and lubricants, but I'm not sure what they are for such volumes.

Answer 4

The cheapest option is a measuring container with an optical filling sensor and an emptying valve, but it will only work in bench conditions (suitable for calibration).
you can assemble a peristaltic flow meter (peristaltic pump without a drive, but with a revolution counter).

Answer 5

Cool task. Scales yes, well, the task can be complicated for interest if we assume that the system moves unevenly. That is, the measured volume will chatter and the level sensor will not roll.