Products for USB Sensing and Control
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PostPosted: Tue Dec 27, 2011 8:21 am 
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Phidgetly

Joined: Mon Dec 06, 2010 5:05 am
Posts: 33
Hi !

What would be the best Phidgets sensor to measure liquid level in a tank (water with fertilizer and ph adjustment liquid) ?

Thanks in advance

Regards


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PostPosted: Sun Jan 29, 2012 8:44 pm 
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Fresh meat

Joined: Thu Jan 26, 2012 8:48 pm
Posts: 3
Would some type of distance sensor work?


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PostPosted: Mon Jan 30, 2012 8:18 am 
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Human-Cyborg Relations
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Joined: Tue Sep 27, 2011 2:37 pm
Posts: 406
Location: Calgary
It is possible that sonar would work though I have never tried it. IR definitely doesn't. I've had some success with using a touch sensor to detect when the water hits a certain height but that's really only useful for one particular depth.

I will test out a sonar sensor today and see how well that works.

In general Phidgets does not have any sort of sensor that is well suited for this.

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Brian Burley
403-282-7335 ext. 6003
support@phidgets.com


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PostPosted: Mon Jan 30, 2012 9:05 am 
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Phidgeteer!

Joined: Thu Mar 04, 2010 2:51 am
Posts: 79
There has been quite a few threads covering this topic. A quick search gave me these:

http://www.phidgets.com/phorum/viewtopic.php?f=3&t=3617
http://www.phidgets.com/phorum/viewtopic.php?f=4&t=3789
http://www.phidgets.com/phorum/viewtopic.php?f=3&t=3962
http://www.phidgets.com/phorum/viewtopic.php?f=3&t=4261
http://www.phidgets.com/phorum/viewtopic.php?f=7&t=4352


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PostPosted: Fri Sep 06, 2013 12:45 am 
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Phidget Mastermind

Joined: Thu Sep 17, 2009 12:17 pm
Posts: 111
burley wrote:
It is possible that sonar would work though I have never tried it.... ...I will test out a sonar sensor today and see how well that works.


Did this ever get tested? I also want to measure liquid in a tank. But, in my case the liquid is fuel oil and the only access I have to the (buried) tank is from above - and the 1128 Sonar Sensor would be perfect for this application.


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PostPosted: Fri Sep 06, 2013 8:44 am 
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Human-Cyborg Relations
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Joined: Tue Sep 27, 2011 2:37 pm
Posts: 406
Location: Calgary
While it would technically work I have to disapprove of this specific application for 2 reasons.

First is that gasoline fumes tend to be fairly corrosive and will result in accelerated wear, effectively shortening the lifespan of the part. This may not be enough to deter you but:

Second I cannot advocate using active electronics, which have not been explicitly rated for use in a flammable environment, in a gas tank.

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Brian Burley
403-282-7335 ext. 6003
support@phidgets.com


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PostPosted: Fri Sep 06, 2013 8:48 am 
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Phidget Mastermind

Joined: Thu Sep 17, 2009 12:17 pm
Posts: 111
Thanks Brian. It is fuel oil, not nearly as flammable as gasoline, but your points are well taken. I am looking around at some parts that may be more suitable for this application.


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