|Feb14-12, 04:19 AM||#1|
Accurately dispense liquid volumes
I am considering the economic viability of a project that must accurately (within a tolerance of, say, 0.5ml) dispense volumes of water from a tank at a constant volumetric flow rate of around 50ml/s.
Within the tank, the water may be held at pressures between 1 and 6bar; and at temperatures between 4 and 18°C. The temperature should not be changed by more than 0.5°C during the dispensing.
The volume to be dispensed will be controlled electronically (between 10 and 250ml).
It is not clear to me what would be the simplest approach, from a pressure regulator in series with a timed valve (which I doubt could achieve the desired accuracy) to some advanced pumping arrangement controlled by electronic flow measurement devices. I imagine it could also be possible to determine the volume of water dispensed via changes in volume remaining in the tank; e.g. the tank could be weighed or include a floating ball measure.
Aside from the criteria detailed above, other considerations include: minimising cost (obviously); ease of regular cleaning (the water is for human consumption); and minimising the physical size of the device.
I would be extremely grateful for your suggestions.
|Feb19-12, 10:13 PM||#2|
I dont understand? If you wish to measure your water that accurate then could you not just use a graduated cylinder with a level sensor on the side?
This idea seems very odd to me, please explain as I must be missing something?
|Similar Threads for: Accurately dispense liquid volumes|
|How to more accurately determine an angle?||Introductory Physics Homework||3|
|What is potential energy of a liquid and why is it negative for small molar volumes?||General Physics||3|
|Measuring distance accurately||Mechanical Engineering||13|
|Measuring resistance accurately?||Introductory Physics Homework||4|
|Accurately measuring noisy DC||Electrical Engineering||1|