Accurately dispense liquid volumes

In summary, the conversation discusses the economic viability of accurately dispensing water from a tank at a constant flow rate of 50ml/s, with a tolerance of 0.5ml. The tank may hold water at pressures between 1 and 6 bar and temperatures between 4 and 18°C, with a maximum temperature change of 0.5°C during dispensing. The volume to be dispensed is controlled electronically, between 10 and 250ml. The simplest approach to achieve this accuracy is unclear, with suggestions including using a pressure regulator and timed valve or advanced pumping arrangement with electronic flow measurement devices. Other considerations include cost, ease of cleaning, and device size. The conversation also brings up the idea of using a graduated
  • #1
eggyal
1
0
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.
 
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  • #2
I don't 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?
 
  • #3
Anestheistiologists use automated fluid (anesthesia) dispensers to control the infusion of volumes of the drugs into patients.
 

1. How do you accurately dispense liquid volumes?

Accurately dispensing liquid volumes requires precise measurement and control. This can be achieved through the use of calibrated instruments such as pipettes, burettes, or automated dispensers. It is important to properly calibrate and maintain these instruments to ensure accurate results.

2. What factors can affect the accuracy of liquid dispensing?

Several factors can affect the accuracy of liquid dispensing, including the quality and calibration of the dispensing instrument, the properties of the liquid being dispensed (such as viscosity or surface tension), and environmental conditions such as temperature and humidity. It is important to consider and control these factors to achieve accurate results.

3. How can I determine the appropriate volume to dispense?

The appropriate volume to dispense will depend on the specific experiment or application. It is important to carefully read and follow any protocols or instructions provided, and to consider the desired accuracy and precision for the results. In some cases, it may be necessary to perform a calibration or trial run to determine the appropriate volume to dispense.

4. How can I minimize errors when dispensing liquid volumes?

To minimize errors when dispensing liquid volumes, it is important to use proper technique and follow established protocols. This may include ensuring the dispensing instrument is properly calibrated and maintained, using consistent and precise movements when dispensing, and avoiding any environmental factors that may affect accuracy. It is also important to double-check measurements and perform any necessary calibrations or adjustments as needed.

5. How can I troubleshoot if I am experiencing inaccuracies when dispensing liquid volumes?

If you are experiencing inaccuracies when dispensing liquid volumes, it is important to first check the calibration and maintenance of the dispensing instrument. It may also be helpful to review and follow any protocols or instructions carefully, and to consider any potential sources of error, such as environmental factors or human error. If the issue persists, you may need to consult with a specialist or troubleshoot further to identify and address the problem.

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