jaschey:
hey ardly,thanks for your comment!
I already thought about that too, i was just afraid about what hapens, if there is no more fluid in the tank and the nozzle still sucks the fluid in. And also its hard to time how long the airflow needs to flow through the nozzle, until the 1,5 ml are dosed. Also then the risk arises that the fluid particles are thrown up by the air flowing in and this influences the end result!But thank you very much for ur input
You have not said what the fluid is. I would have thought you could have a relatively big tank and be able to detect when it was nearly empty so pumping or sucking when there is no fluid should not be a problem.
Also with the original solution don't you still have the same problem of knowing when all 1.5ml are dosed and of avoiding large fluid particles?
Is the problem with particles not just down to the orifice size, if the hole is very small you will get afine 'atomised' spray.
This has actually made me think of ink jet printers. For them 1.5ml is actualy an enormous volume. Maybe you could use that type of mechanism;