Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Guessing, so sorry if wrong, browse Honeywell's sensors, and similar companies if you haven't already. Possibly sensor manufacturers that deal with medical instruments would have a salinity probe?
I m finding some probes but they are all for specific meters , There must be someone on this forum who knows how to interface these probes and where to find them, please advise.
Conductivity probe is just two metal prongs or electrodes.
It needs to be energised with an ac current.
The resulting ac voltage that can then be measured across the probe will depend on the ac current, the probe dimensions, and very likely the temperature.
When you have that, you then need a lookup table to convert electrical conductivity to salinity.
There is no special salinity probe that outputs a salinity value directly, its just not possible.
All you can buy will be a very simple commercial probe as a spare part that plugs into something that already contains all the (magic) electronics and software to make it work.
Two nails taped to a wooden stick would make a perfectly practical salinity probe.
But without the rest of the instrument that is going to be pretty useless by itself.
If you do buy a commercial probe, what you will get is (virtually) two probably stainless steel nails inside a fancy plastic housing, a cable, and a plug.
There is nothing in it that you cannot make yourself for maybe less than a dollar.
Conductivity probe is just two metal prongs or electrodes.
It needs to be energised with an ac current.
The resulting ac voltage that can then be measured across the probe will depend on the ac current, the probe dimensions, and very likely the temperature.
You will need to make up your own lookup table by calibrating the probe and electronics against water samples with known values of salinity.
You are not the very first person to ever want to do this, and some serious searching on the internet should turn up useful hints and information from other people's projects.
If I understood Tony, search for (home-made) soil humidity sensors, it sounds like the same principle, minus using ac current - two pieces of wire, or two long nails and a piece of wood or foam separating them, proportional voltage out is humidity, or salinity. - The salinity version sounds really hard to calibrate, needing a lot of patient testing and note-taking.
You can use this principle to make a very bad "lie detector", using two small copper pads - it senses sweat on palm of hand of person as they say truth or lie...I doubt you could seriously use it other than as a party piece though, as not all liars must have sweaty palms and some honest people probably do for other reasons when they speak!
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
