Is it possible to connect 2 water meter sensors to my HD-12??

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Stephen Stilwell

March 16, 2022 05:28

I have 6 of my irrigation valves on one water supply line and the other 6 valves on another line. They are on opposite sides of my property so they cannot be on a single water supply line. I successfully installed a water meter with sensor on one of the  supply lines and it works great. I would really like to add a second water meter on the other line and tie them to the HD-12. Worst case, I can build a logic circuit with relay to switch from one sensor to the other depending on what valve number is activated but I am looking for a simpler approach. Any ideas?? Thanks! 

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  Christian April 07, 2022 07:13

  Hi Stephen,

  Yes, you can connect them in parallel if you connect them like you described. They will read on turns and cumulate the reading.
  Ideally, they should have the same pulse/gallon reading.

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  Stephen Stilwell April 07, 2022 17:17

  The reason I didn't connect them in parallel is because if one is in the on position it will short the other and there will be no output. I did build the logic circuit and successfully tested it yesterday. It is pretty complicated but work great. I used this relay module: https://www.amazon.com/dp/B07ZCXQPK4?psc=1&ref=ppx_yo2ov_dt_b_product_details

   

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  Stephen Stilwell April 15, 2022 06:16

  My system is working great with 2 water meters. Here is the circuit followed by a picture of it running. 

  

   

  

   

  What I find amazing is that I have identified 2 major water leaks I have by using the info provided by the water meters and today I corrected one leak, saving over 2,500 gallons of water per month and I will tackle the second one (even larger) tomorrow. I also have no idea how long I've had these leaks, months?, years??  Good stuff!!

   

  Steve 

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