Water pressure sensors?



  • @gohan
    gohan great solution wish I had thought of that! Not sure where I got the info that it wouldn't work. They didn't say how long it would take to get bad readings.
    Because the pressure transducer I used is sealed you wouldn't have the same problem. As long as the connection were made watertight the sensor could just be installed at any level and it should work without the extra pump. Assuming you don't install it with the open end pointing down trapping a tiny bit of air in the opening. Not sure that would affect the readings but why take the chance.


  • Mod

    I have the plastic pipe for the compressed air pointing down so it doesn't get clogged and it runs down 60 meters with the pump. Of course the pressure reading is not very precise on an old "analog" gouge but at least I get the idea if I have 40 meters of water instead of 30, I don't really care if the actual level is 41 or 39


  • Mod

    Thanks everyone for your ideas.

    As most of you figured out, this is not for a home DIY project. It is not my project so I can't share a lot of details.

    The "industrial" solutions are expensive (for example, the "submersible transducer" linked by @JohnRob costs $400+) and require big sensors. Often, DIY users have found clever solutions - and several such solutions have been suggested here which has given me a good perspective of the possibilities which I really appreciate. Thanks!


  • Mod

    I don't know if it may fit in the project, but some of these could be used to get a rough idea of the water level



  • @mfalkvidd

    If I were to look for a lower cost solution (vs a full industrial offering) I would talk to Epcos EU.

    I have worked with them in the past and they have a small absolute pressure sensor that may work for you.

    John



  • I just received an email about these Honeywell PX3 series pressure transducers today:
    https://www.sager.com/external-freeze-thaw-resistance/default.aspx

    https://sensing.honeywell.com/sensors/heavy-duty-pressure-sensors-and-transducers/PX3-series
    I didn't read into them much, but you may find a solution with them.



  • Does anyone have an idea on cost efficient water pressure/level measurement in 1000 ft deep groundwater wells? There is a new law in California that made these measurements mandatory and my good friends have to drive some crazy mileage to do manual cord measurements of water level.



  • If you want to measure level in a sewer and get a measurement that can be used for something "that have a high degree of accuracy" it needs to be atmospheric compensated, otherwise the measurement will be off by a lot, because of pressure in the pipe system, normally a sewer system is not open to the atmospheric pressure because of gases.

    If your application is anything like the picture, that would not be a good solution, since a atmospheric sensor would have a small air tube and getting water into those would make it unstable.

    if you can put your vent tube so no water gets in then a pressure level measurement would be a good solution.
    I normally use alibaba for that.
    https://www.alibaba.com/trade/search?IndexArea=product_en&CatId=&fsb=y&SearchText=pressure+sensor+for+sewer

    But if you only want to know when the water level reach a certain height there is the option of using a float switch.

    I often find that there is a need for a combine solution, both pressure/ultrasonic and a float, to keep up a high accuracy, sewer systems are a whole other world when it come to sensor technology, but again it depends on what you need.



  • @ybirch

    https://www.alibaba.com/product-detail/CS-Pressure-measuring-instrument-diffused-silicon_60734702750.html

    above link is an example of a sensor which could be used. Not sure what the level change will be, but the "new law" as you refer to will tell you what accuracy is needed. This sounds to me as a perfect example of a LoRa sensor.
    The sensor goes in the bore hole (same as the manual cord measuremens) and stays there. The electronics (4-20 mA preferrably as 1000 ft is quite a distance) can remain at ground level.

    If you have any idea what the change of level is in the well, you can easily find the range for the sensor.

    BR,

    Boozz



  • @ybirch Hi did you see the post I posted?
    https://forum.mysensors.org/topic/9313/water-pressure-sensors/30
    cost efficient, use a salvaged refrigerator compressor and purchase a long aqaurium airpump hose and a pressure transducer - might be fairly cheap


 

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