Tank Depth
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From: Charles Jean on 6 Jul 2006 23:40 On Thu, 06 Jul 2006 23:31:45 GMT, "James F. Mayer" <jfma(a)ix.netcom.com> wrote: > >"Joerg" <notthisjoergsch(a)removethispacbell.net> wrote in message >news:4ccrg.62358$fb2.3135(a)newssvr27.news.prodigy.net... >> Hello Rich, >> >>> >>>>Paint, exposed metal, all that will rot over time. I have even seen steel >>>>corrode although it was sold as stainless. In an application like this >>>>ideally you need something that you can build and forget for a few years. >>> >>> And your objection to making a yearly inspection of your facilities would >>> be....? ;-) >>> >> >> This looks like a rig for personal use. Yearly inspections are ok but if >> you find something amiss on every one of these it'll become a hassle. It's >> always best to design something to last literally forever. >> > > All of the suggestions are good but one of the problems is that all of >the drums are plastic, probably something I should have mentioned at the >beginning. I have around 25 drums in the system. and would like to monitor >each drum individually as well as a whole. > > I came across these pressure sensors: the MPX2010 and its amplified >version the MPX5010 in my rummaging through DigiKey. Has anyone had any >experience with them? Do you think they would work in the harsh environment >of a backyard in West Central Florida? > What case styles would you suggest? Could I build them in a small >potting box and pot them to make them more weather resistant and what sort >of potting would I use? > ___ How about a strain gauge that goes up to 400-500 lbs and weigh them? They are used in some pretty rough environments. I have no idea of the cost though. ___ If God hadn't intended us to eat animals, He wouldn't have made them out of MEAT! - John Cleese
From: John Fields on 7 Jul 2006 07:50 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. Here's a really simple and reliable way to do it: http://www.madisonco.com/level/LLS.htm -- John Fields Professional Circuit Designer
From: Joerg on 7 Jul 2006 14:00 Hello James, >> >>With proportional pressure sensors that is going to become expensive. >>Unless money is not too important here I'd go with float switches. > > But where is the fun in designing curcuits? > True. But since you said you are in a hurry, wife breathing down your back, reminding you to get it done, saying there are lots more honey-dos on the list... > > The lowest pressure rating that I saw was 15 PSI. Too high and I would > have to construct some sort of amplifier to bring up the voltrages to > reasonable levels. The pressure I believe that I would be working with is > about 1.29 PSI (.43*3 Ft.). The range on the MPX5010 is 1.45 PSI and is > amplified to have a F/S output of 4.475 VDC with a F/S span of 4.275 with a > supply volyage of 4.75 VDC. > Sure, but there is fun in designing circuits :-))) > > >>Whatever you do keep in mind that stuff like this may have to be serviced >>and repaired. Murphy's law stipulates that there will be a driving rain, >>gale force winds and some hail when that happens. > > Then the irrigation pump shouldn't be running. > Yes, if you don't have a weather pattern like we do. A month of bone dry weather followed by a huge storm. Then another dry spell comes up, meantime a sensor croaked but now you have to leave for a lengthy biz trip to Asia. > Maybe I should add a precipitation detector also? > I assume you run it via a sprinkler controller or something like that, with a master pump output. For many of those you can buy a precipitation sensor. The really good ones may allow for gradual adjustment of the zone times depending on how much precipitation there was. -- Regards, Joerg http://www.analogconsultants.com
From: Joerg on 7 Jul 2006 15:06 Hello John, > > Here's a really simple and reliable way to do it: > > http://www.madisonco.com/level/LLS.htm > Cool. Looks like the Lexus edition of ye olde float switch. Thanks for the link. -- Regards, Joerg http://www.analogconsultants.com
From: James F. Mayer on 9 Jul 2006 09:23
"Joerg" <notthisjoergsch(a)removethispacbell.net> wrote in message news:Gixrg.62605$fb2.62283(a)newssvr27.news.prodigy.net... > Hello James, > >>> >>>With proportional pressure sensors that is going to become expensive. >>>Unless money is not too important here I'd go with float switches. >> >> But where is the fun in designing curcuits? >> > > True. But since you said you are in a hurry, wife breathing down your > back, reminding you to get it done, saying there are lots more honey-dos > on the list... > What wife? I ain't got no steenking wife. >> >> The lowest pressure rating that I saw was 15 PSI. Too high and I >> would have to construct some sort of amplifier to bring up the voltrages >> to reasonable levels. The pressure I believe that I would be working >> with is about 1.29 PSI (.43*3 Ft.). The range on the MPX5010 is 1.45 >> PSI and is amplified to have a F/S output of 4.475 VDC with a F/S span of >> 4.275 with a supply volyage of 4.75 VDC. >> > > Sure, but there is fun in designing circuits :-))) > Sure, but forcing a part to do what it wasn't designed for and not within the specs when there is one that is doesn't sounf good to me. >> >> >>>Whatever you do keep in mind that stuff like this may have to be serviced >>>and repaired. Murphy's law stipulates that there will be a driving rain, >>>gale force winds and some hail when that happens. >> >> Then the irrigation pump shouldn't be running. >> > > Yes, if you don't have a weather pattern like we do. A month of bone dry > weather followed by a huge storm. Then another dry spell comes up, > meantime a sensor croaked but now you have to leave for a lengthy biz trip > to Asia. > I'd like to take a trip to Asia on business. I'd like to have a business where I could afford to go to Asia. > >> Maybe I should add a precipitation detector also? >> > > I assume you run it via a sprinkler controller or something like that, > with a master pump output. For many of those you can buy a precipitation > sensor. The really good ones may allow for gradual adjustment of the zone > times depending on how much precipitation there was. > Know of any ones like that? |