Simply reduce its rotation speed controller. You can also change to the smaller inner diameter tubes. If not, get smaller capacity pump.
yas I tested you comments, and there is not a pump with smaller capacity from etatron and heidolph
If you are unable to use a pump with smaller nominal flow rate, or you have not the possibilities of reduce the speed of rotation, I think you will applicable only a "creative ways"...
One such the "creative ways" is to dividing the flow of liquid downstream of the pump into two parts. Next - experimentally - can adjust the flow rate of the two streams, so, that one of them will be identical to what you need, and the other - redundant - can be returned to the original container of the liquid.
Above explained three options are the best to try first
- Control Speed of rotor (RPM),
- Diameter of silicone tube or
- try to take bypass by putting small valves,
Also you can try to use saline bottle and pipe where you can set drop wise flow (Action by gravity) or any such similar setup for batch experiments. (For larger experiment use large volume reservoir)
FYI one Indian company (Ravel) offers wide range of peristaltic pumps,
http://www.ravelhiteks.com/products.asp
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