Quote Originally Posted by Melanie View Post
I've done heaps on water-level sensing over the years... and my conclusions are that anything you put in the water will corrode and die eventually if it's not encapsulated and sealed or it's Stainless Steel.
That's it in a nutshell, either or. The key here is eventually. Copper pipes last 40 + years in water, but Eventually fail. Stainless steel is a pain in the . . . eye to work with without a machine shop, and cobalt or carbide tooling. Plastic on the other hand is very user friendly (encapsulated). The reed switch idea is good, and cheap, and could be easily encapsulated in plastic or a glass tube, a magnet on a float ring on the outside. Again it would be helpful to know the range we are measuring, how long it needs to last, 5 months, 5 years, 500 years . . . when selecting a method.