Tank Depth
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From: James F. Mayer on 4 Jul 2006 17:55 I believe that a short time ago there was a discussion about this. but depending on the head of the tank one could use an MPX5000 series pressure sensor with a dip tube or am I too late? I have a number of 55 gal drums of water that I would like to know the depth of in my rain water gathering system so that I don't pump it dry and ruin a sprinkler pump. I am going to use one of them per drum to monitor the levels. I believe that the pressure of one foot of head is .43 PSI and that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this sound correct?
From: John Larkin on 4 Jul 2006 18:04 On Tue, 04 Jul 2006 21:55:16 GMT, "James F. Mayer" <jfma(a)ix.netcom.com> wrote: >I believe that a short time ago there was a discussion about this. but >depending on the head of the tank one could use an MPX5000 series pressure >sensor with a dip tube or am I too late? > > I have a number of 55 gal drums of water that I would like to know the >depth of in my rain water gathering system so that I don't pump it dry and >ruin a sprinkler pump. I am going to use one of them per drum to monitor >the levels. I believe that the pressure of one foot of head is .43 PSI and >that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this >sound correct? > Yes. But what's a dip tube? John
From: James F. Mayer on 4 Jul 2006 18:36 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:8fpla2hh5dfn7fq9gkrhgpelmnomkit93f(a)4ax.com... > On Tue, 04 Jul 2006 21:55:16 GMT, "James F. Mayer" > <jfma(a)ix.netcom.com> wrote: > >>I believe that a short time ago there was a discussion about this. but >>depending on the head of the tank one could use an MPX5000 series pressure >>sensor with a dip tube or am I too late? >> >> I have a number of 55 gal drums of water that I would like to know the >>depth of in my rain water gathering system so that I don't pump it dry and >>ruin a sprinkler pump. I am going to use one of them per drum to monitor >>the levels. I believe that the pressure of one foot of head is .43 PSI >>and >>that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this >>sound correct? >> > > Yes. But what's a dip tube? > > John > A tube that reaches to near the bottom of the tank/drum from the top.
From: Paul Hovnanian P.E. on 4 Jul 2006 18:50 "James F. Mayer" wrote: > > I believe that a short time ago there was a discussion about this. but > depending on the head of the tank one could use an MPX5000 series pressure > sensor with a dip tube or am I too late? > > I have a number of 55 gal drums of water that I would like to know the > depth of in my rain water gathering system so that I don't pump it dry and > ruin a sprinkler pump. I am going to use one of them per drum to monitor > the levels. I believe that the pressure of one foot of head is .43 PSI and > that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this > sound correct? That sounds about right. However ... This technique of measuring tank depth (quantity) may not work well over a long period of time. In a washing machine, for example, the dip tube only needs to maintain a reading for the duration of the fill cycle. I suspect that slow leakage or air in the dip tube dissolving into the water over longer periods (days, weeks) may reduce its accuracy. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ Time's fun when you're having flies. -- Kermit the Frog
From: Luhan on 4 Jul 2006 19:32
James F. Mayer wrote: > I believe that a short time ago there was a discussion about this. but > depending on the head of the tank one could use an MPX5000 series pressure > sensor with a dip tube or am I too late? > > I have a number of 55 gal drums of water that I would like to know the > depth of in my rain water gathering system so that I don't pump it dry and > ruin a sprinkler pump. I am going to use one of them per drum to monitor > the levels. I believe that the pressure of one foot of head is .43 PSI and > that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this > sound correct? It may be much easier to simply detect the tank going empty. Maybe a float switch near the bottom or a short piece of pvc pipe on the output to the pump with a pair of electical contacts. Luhan |