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 Post subject: Range finder specs
PostPosted: Sun Aug 14, 2016 1:24 pm 

Joined: Sun Aug 14, 2016 8:33 am
Posts: 6
I am looking to set up a way to remotely check the level in a well.

I would prefer to use something like an ultrasonic or laser rangefinder so I don't have to put a sensor at the bottom of the well.

Are there any ideas for sensors I might use? I need a range of 30+ feet.


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 Post subject: Re: Range finder specs
PostPosted: Mon Aug 15, 2016 9:49 am 
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Joined: Thu Oct 26, 2006 7:11 pm
Posts: 1293
Location: Maryland
One of our customers does well testing, for contaminants. He needed to accurately measure the water level when he inspected the well. I built a probe that could be lowered on a measuring tape. When it touched the water surface a bright LED turned on and he could see it down hole. There are electronic probes that do the same thing by lowering a cable and a beeper turns on.

I have a chemical water treatment tank that has a probe I designed. It is a hollow plastic tubing with 10 stainless steel screws along the side and a common screw in the bottom.
Each screw connects to a conductor of a ribbon cable, threaded through a poly tube. The circuit connects to a bar graph LED array and each bar lights when it is wet. You could also hook a signal to a selected point and get a low level alarm when the LED goes out. Seal the screws well or the wire will corrode!
There are also pressure sensors tht could be calibrated for depth of a tube going down the well.

Maybe there's an idea in this for you?



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Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)
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 Post subject: Re: Range finder specs
PostPosted: Mon Aug 15, 2016 11:19 am 

Joined: Sun Aug 14, 2016 8:33 am
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I'm trying to set up a remote station that will communicate by cell modem, and will hopefully integrate the water level in the well and a weather station.

It seems less complicated to have a sensor that will detect the water surface and allow me to determine water height that way rather than an in-water sensor, since then I have to compensate for atmospheric pressure, as well as running wires all the way to the bottom of the well.


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 Post subject: Re: Range finder specs
PostPosted: Mon Aug 15, 2016 11:25 am 
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Joined: Thu Oct 26, 2006 7:11 pm
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Location: Maryland
As a side note...
I wonder what reflections from the well pipe will do to a ultrasonic system's accuracy?



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Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)
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 Post subject: Re: Range finder specs
PostPosted: Wed Aug 24, 2016 5:01 am 

Joined: Sun Aug 14, 2016 8:33 am
Posts: 6
Well, we'll see if this works. I think I will go with the Maxsonics MB-7066.

According to Maxsonics, it has a 10m range, should be good for the temperature range I am thinking is reasonable to assume, and has PWM and analog voltage for hooking up to an Arduino.


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 Post subject: Re: Range finder specs
PostPosted: Wed Aug 24, 2016 6:39 am 
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Location: Maryland
Keep us in the loop!



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Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)
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