Re: Tank Depth


"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:mXhrg.127309$dW3.53031@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello James,


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.


Argggh... coulda told us earlier.

... Forgiven.


.. I have around 25 drums in the system. and would like to monitor each
drum individually as well as a whole.


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?


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?


Probably not. Also, note that only one of the 5010's is in stock, and
they've got just 55 of them (seems you'd need 25 of these plus spares).


I was thinking just 2 to get on with the experimentation and then, when I
have the bugs worked out, get more. I am not in a real hurry. Just
something I thought about when I started to run sprinkler lines.


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?

I'd look for something more industrial. Check Honeywell and the local
Grainger outlet. Ideally I'd want something where I could drill a hole,
cement in a fitting and then screw the sensor in with Teflon tape. IOW a
clean plumbing job, no kludges. IIRC the Honeywell 236PC series has that
thread but you'd have to check whether it fits, gives you the desired
resolution etc.


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.




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.

Maybe I should add a precipitation detector also?



.

Relevant Pages

  • Re: Chamber Pressure
    ... One could bias up a Wheatstone bridge and amplify with AD8554 op amps ... measures a static pressure of 15,000 psi with a dial gauge. ... Oehler used a 1NA128 amplifier from some time since. ...
    (rec.guns)
  • Re: Tank Depth
    ... would have to construct some sort of amplifier to bring up the ... the low pressure ones you mentioned ... Matbe I'll have to put thim in some sort of enclosure with pipe threads ... times depending on how much precipitation there was. ...
    (sci.electronics.design)
  • Re: Tank Depth
    ... would have to construct some sort of amplifier to bring up the voltrages to reasonable levels. ... the low pressure ones you mentioned look a bit flimsy. ... 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. ...
    (sci.electronics.design)
  • Re: OT: the rubbing effect
    ... rested against the drum and drove the centre of the diaphragm. ... development of the thermionic vacuum tube amplifier. ... to this 'slipping clutch' would put pressure onto the diaphragm. ... pressure plate so as to modulate the spring bias pressure, ...
    (uk.tech.digital-tv)
  • Re: OT: the rubbing effect
    ... rested against the drum and drove the centre of the diaphragm. ... development of the thermionic vacuum tube amplifier. ... to this 'slipping clutch' would put pressure onto the diaphragm. ... pressure plate so as to modulate the spring bias pressure, ...
    (uk.tech.digital-tv)