Yet another water system thread

first post on arduino boards, howdy.

i've been lurking on both arduino , rpi boards while , have done fair bit of googling prior making post avoid asking redundant questions.

my hardware goal - monitor 4 pressure points on homes water system (schrader valve on pressure tank , inline 3 other analog gauges) , detect when 2 pressure switches operate (your typical 30/50 square-d 9013fsg2j21 240vac) , detect level of fluid in chem feeder's supply tank

my software goal - collect data points using rrd can both display data on lcd in water room able view on local network. when chem tank gets level, sms or email me notification can act accordingly.

just preface, have sulfur in water, hence chemical stuff , pre-treat feed outside water , post-treat feed in house.

with out of way, questions follows:

1) lots of pressure transducers out there, familiar or can recommend ones hold in chlorinated water environment

2) sensing 240 vac... dont need control switches, want know if on or off... primary pressure switch fed panel... secondary switch (that engages chem feeder) fed load side of primary

3) tank level in, again, caustic liquid (chlorox bleach) - tank ~36" high 18" wide


just background, setup such when outside water being used (drawn before injection site) chem feeder doesn't dump chlorine house water isnt being used... secondary switch energized when main switch calls pump , when house pressure drops accordingly turn feeder on.


i'm favoring going arduino has built in adc pi not - outside of haven't made other considerations.


the rest of can gleam other projects online, etc (coding, display driving, etc) looking solid advice on sensors.

if can't find sensors hold in chlorinated environment (mttf ~12 months) i'll skip don't want add add more up-keep system - goal of simplify things acknowledge won't lights-out in perpetuity chlorine kills eventually.

thanks =)

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