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SoloSK71
01-08-2017, 04:56 AM
ANyone familiar with these (https://www.instrumart.com/products/40922/we-anderson-ols-level-switch)? Or a better, less expensive option?

W.E. Anderson OLS Level Switch, the cheapest optical ones I could find. I would like to add a couple of these for fail safe shutoff for my RO tanks.

Charles

dino
01-08-2017, 02:21 PM
we use something like this for our swimming pools in the surge tanks. the only thing I can say is you will have to run it in a tube or something because the laser can bounce off debris or items and cause and incorrect reading. I just use cheap float valves myself and never had an issue.

Default
01-08-2017, 09:23 PM
I ended up making my own.

Digikey has a decent article on it. I used it do design mine.
http://www.digikey.ca/en/articles/techzone/2011/nov/liquid-level-sensing-part-2-optical-gravitational-and-sonic-techniques