geekinthesticks
Posts: 96
Joined: Fri Feb 08, 2013 7:22 pm

Suggestions for Liquid Level Sensor

Sat Mar 09, 2013 1:45 pm

I need to monitor the level of several tanks containing heating oil/diesel. At the moment I am using a simple dip stick. However, I would like to monitor these electronically. I did some experiments with an ultrasonic range finder, but it wasn't accurate enough for various reasons. Has anyone got any suggestions for a suitable sensor that would interface with a Pi.

I don't just want a low level warning, but something that can tell me the height of the liquid in the tank, so I can monitor the rate of consumption. I have had a look around for some sort of float monitor, but can't seem to find anything out there.

User avatar
aTao
Posts: 1093
Joined: Wed Dec 12, 2012 10:41 am
Location: Howlin Eigg

Re: Suggestions for Liquid Level Sensor

Sat Mar 09, 2013 2:04 pm

A first thought is.. Have you considered a pressure sensor at the bottom of the tank or on connected pipe work eg, the outlet.
This one should do the trick. http://cpc.farnell.com/honeywell-s-c/24 ... dp/SN35336
Cant find out if it can handle contact with oil but that can be fixed by placing it at the top of a sealed tube.
>)))'><'(((<

techpaul
Posts: 1512
Joined: Sat Jul 14, 2012 6:40 pm
Location: Reading, UK
Contact: Website

Re: Suggestions for Liquid Level Sensor

Sat Mar 09, 2013 8:49 pm

Cant remember the name but various wireless solutions exist to talk to a special receiver with LCD display. Perhaps you should consider using one of these and use a radio receiver to pick up the radio signal and decode that.
Just another techie on the net - For GPIO boards see http:///www.facebook.com/pcservicesreading
or http://www.pcserviceselectronics.co.uk/pi/


techpaul
Posts: 1512
Joined: Sat Jul 14, 2012 6:40 pm
Location: Reading, UK
Contact: Website

Re: Suggestions for Liquid Level Sensor

Sat Mar 09, 2013 10:23 pm

Do a search for "wireless heating oil tank gauge" brings up lots of sites.

The one I remember and have seen in use is the Watchman that has been superceded but can be seen at place like http://www.bellflowsystems.co.uk/fuel-t ... vel-gauge/
Just another techie on the net - For GPIO boards see http:///www.facebook.com/pcservicesreading
or http://www.pcserviceselectronics.co.uk/pi/

RomanG
Posts: 41
Joined: Fri Aug 17, 2012 11:56 am
Location: Ottawa, Canada

Re: Suggestions for Liquid Level Sensor

Sun Mar 10, 2013 1:08 am

I need to monitor the level of several tanks containing heating oil/diesel....
How tall/deep is your tank and what is your budget?
Would you need continuous reading or several switch point across the tank depth would be sufficient?
There are many commercial products available or you can salvage car fuel tank level sensors (depending on your budget and depth of the tank).
Give us some more details to work with.

Cheers,
Roman

lbendlin
Posts: 7
Joined: Mon Jan 07, 2013 6:51 pm
Location: MA, USA

Re: Suggestions for Liquid Level Sensor

Sun Mar 10, 2013 2:07 am

geekinthesticks wrote: but it wasn't accurate enough for various reasons.
Care to extend on that statement?

Here are a few other options. http://www.jmesales.com/catalog/tank-ga ... 4AodNy4A2g

My existing mechanical gauge includes a little magnet at the top of the float. So I am using an array of reed contacts to get my readout. Even with ten reeds you can get a 5% resolution level (by checking if more than one reed is triggered)

Return to “Automation, sensing and robotics”