Flow meter for laser cooler

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Flow meter

Flow meter, a set on Flickr.

The laser cooler I am currently building need a safety system that shuts off power for the laser if coolant fail to flow.
Me and a colleague was searching supplier catalogues for a suitable flow sensor but nothing seemed ideal or was too expensive.
At some point I figured that i could design and build a flow sensor quicker than it would take for one to be delivered…

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