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water level sensor pipe diameter

Posted: Wed Nov 15, 2017 10:35 am
by binder
i’m gonna work on my own dosing containers and i plan on using the water level sensors. i know the 1/2” pipe is recommended but i wanted to use something different. i was hoping to use like a 1/4” or 3/16” tube with the air hose connected to it, so i have a small footprint in my container. will this work or not? i haven’t had time to test on my setup so i figured i would ask first and i didn’t find anything concrete on here.


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Re: water level sensor pipe diameter

Posted: Wed Nov 15, 2017 9:28 pm
by rimai
It doesn't work.
There is not enough pressure in a such small tubing.
You would need a custom module with more sensitive sensors.

Re: water level sensor pipe diameter

Posted: Thu Nov 16, 2017 5:21 am
by binder
ok. good to know. so the minimum pipe diameter that will currently work is the 1/2". thanks!

doing something like this with the more sensitive sensor could be something that might be of interest to people...might be something to look into pricing for it. just a thought.

anyways, thanks for the info!

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Re: water level sensor pipe diameter

Posted: Thu Nov 16, 2017 11:29 am
by rimai
It is very expensive for a more sensitive sensor :( It costs 3 times more.
I think it would be cheaper to use etape.

Re: water level sensor pipe diameter

Posted: Thu Nov 16, 2017 11:37 am
by rimai
etape is even more expensive :(

Re: water level sensor pipe diameter

Posted: Thu Nov 16, 2017 6:28 pm
by binder
rimai wrote:It is very expensive for a more sensitive sensor :( It costs 3 times more.
I think it would be cheaper to use etape.
holy cow! oh well, thanks for checking! I've got an idea for what I can do and it will just require using the 1/2" pipe.

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Re: water level sensor pipe diameter

Posted: Sat Nov 18, 2017 5:48 pm
by lnevo
would a wider diameter work better and give us better granularity for deeper measurement? or wouldn't do anything different?

Re: water level sensor pipe diameter

Posted: Sat Nov 18, 2017 6:40 pm
by rimai
For deeper measurements, you actually need the opposite.
The wider the diameter, the more displacement of air and thus more pressure you are going to generate.
You need a sensor that will read more pressure.
The one we use now is 0.57psi. For deeper measurements, you may create more pressure than that and for small tubing, you don't create not nearly enough pressure.
But, if you use a lesser diameter for a deeper measurement, it may work good for you with the current sensor.

Re: water level sensor pipe diameter

Posted: Sun Nov 19, 2017 8:09 am
by lnevo
Hmm so maybe a John Guest 1/4" -> 3/8" and a 3/8" rigid tube?

Re: water level sensor pipe diameter

Posted: Sun Nov 19, 2017 9:39 am
by rimai
It should work.

Re: water level sensor pipe diameter

Posted: Wed Nov 22, 2017 11:09 am
by Pny
The pressure in the air column inside the pipe is the same regardless of the shape and dimensions of the pipe.

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Re: water level sensor pipe diameter

Posted: Wed Nov 22, 2017 11:35 am
by rimai
Is it?
I think the shape and dimension is a factor.
The bigger the shape, the more air displacement per linear measurement it will have as the water rises inside the tube.
Let's say 1cm of water rise in the tube of 1/4" will displace less air and create less pressure as oppose to a 2" tube.
Or am I not understanding this correctly.