First let me say that this is the very first Instructable that I have made so please be easy on your critiques.
I have a very elaborate well water treatment system that had been plagued with problems. One problem is I am using chlorine to kill bacteria and then removing the chlorine with charcoal before the water gets to my RO membrane. Anyway that is more than enough background.
I decided to eliminate the chlorine and install a whole house UV filter. The UV bulbs are good for 9000 hours and most people, I assume, just plug them in and leave them. I fail to see any benefit to the light being on when there is no water movement so I figured I would control the light with a flow switch. All of the flow meters that I found on ebay, Amazon or Grainger were either too expensive or did not give me the specifications that I was looking for. So its do-it-yourself time.
The object of this project is to detect the movement of water in a 1" PVC pipe and turn a receptacle on and off.
This is the finished project. Most of the PVC was just stuff found in the workshop so please ignore the stains.
Step 1: Parts layout and parts list.
This project can be sized to fit the project you are working on so there is nothing special about 1" PVC.
PVC threaded adapter
PVC threaded cap
Plastic ( had nylon on hand) dowel with a diameter almost the same size as the inside of the size PVC that you choose
Some lead weight
high power magnets that will fit in the hole that you will drill in the plastic dowel
a rubber O-ring to fit the size of your dowel (see later steps)
A reed switch
Other PVC fittings and pipe to fit the application that you have
Hacksaw or PVC cutter
A lathe or access to one is a real help.
27/64" (for the 1" PVC size)
1/2" - 13 Thread per inch tap and wrench (also for the 1" PVC size)