Rainwater tank level measurement  

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Kops
 Kops
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August 20, 2018 13:46  

I have been searching for suitable non-contact ultrasonic sensors, that could be used for monitoring the water level through Loxone. I found a few that do have the 0-10V output, which is easy to connect into Loxone analog input.

  1. Ultrasonic water level sensorUB2000-F42-U-V15 (~220€, range 60...2000mm)
  2. Ultrasonic water level sensorUB4000-F42-U-V15 (~240€, range 200...4000mm)
  3. Ultrasonic water level sensorUB6000-F42-U-V15 (~270€, range 350...6000mm)
  4. Ultrasonic water level sensorULM-53 (~300€, range varies based on the model from 0.1 ... 1 m; 0.2 ... 2 m; 0.2 ... 6 m; 0.4 ... 10 m; and 0.5 ... 20 m. See datasheet on the web of the manufacturer)

The last option was quite nice surprise to find, and is probably the most interesting one.

Ultrasonic water level measurement

Here I am not aiming to serve a complete product market research, nor have I studied all the documentation for available product, but the last product seems to be be able to calibrate/map the water level limits to 0..10V. This achieves a truly accurate measurement, because the voltage range on output will fully cover the working range of the water levels in the given tank.


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Kops
 Kops
(@kops)
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September 4, 2018 17:25  

I have ordered this Level sensor from AliExpress, it should arrive every moment. I will post an update once tested.

 


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Kops
 Kops
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September 11, 2018 11:53  

The water level sensor has just arrived. I am looking forward to test it. It should work with 12- 36 VDC, and the output is 0-10V which is great. Based on my request, the scale is from 0 to 1 meter water depth, which is OK for my tank with dept of 130 cm and water overflow is at 108 cm. I am really excited to try this.

Now I was a bit afraid, how can this be measuring water level based on the pressure at the bottom of the tank, if the sensor is isolated there with no reference to atmospheric pressure. But the reference point here is not vacuum here, it is the atmospheric pressure. And guess how they did that. There si a tiny red pipe in the cable where the atmospheric pressure goes in and where the sensor gets the reference. I will post more details once I install and test this sensor. 


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Kops
 Kops
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November 5, 2018 23:12  

I have to say, I am very happy with the pressure water level sensor. More details are in my blog post.


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