You know, an alternative to that would be to use the refraction
properties of water to his advantage.  Water does bend light.


Shawn Wilton
Junior in CpE
MicroBiologist


http://black9.net


M. Adam Davis wrote:
> If you can afford a DIY solution then make a section of the hose
> translucent, affix a cage with a ball in the hose, and put the assembly
> vertical - use an optosensor to see if the ball is up during flow, down
> when no flow.  Make sure the ball is about the same specific gravity as
> the solution so it doesn't float naturally, or sink even during flow.
>
> Can also use impeller blades, or other objects.
>
> -Adam
>
> dr. Imre Bartfai wrote:
>
>> Hi PIClisters,
>>
>> I need to check whether there is a water flow in a 1" rubber pipe. I
>> thought about a so-called rotameter at first. It is made by Krohne. I got
>> an offer for $840 which is hardly affordable for that project. Any
>> alternative suggestions are welcome - I do not need the amount of the
>> flow, only whether it is there or not.
>>
>> Thank you in advance.
>>
>> Imre
>>
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>>
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