Was wanting to measure river water from a local source.

-Josh

On Sun, Nov 22, 2009 at 4:34 PM, Richard Pytelewski
<rjp_psi@bellsouth.net>wrote:

> pH sensors have a semi-permeable membrane and can clog if you pick the
> wrong
> type (There are pores which permit the measurement to occur).. There are
> "industrial" pH electrodes which are more tolerant of "crud" but if you are
> measuring water with particulate matter in it, all pH electrodes with clog
> in time.
>
> What are you measuring exactly?  At what temperature (ph is measurement is
> T
> sensitive)?  More info would help.  Why are you measuring dissolved O2?
> Have a koi pond?
>
> Rich
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of
> Joshua Shriver
> Sent: Sunday, November 22, 2009 2:19 AM
> To: Microcontroller discussion list - Public.
> Subject: [PIC][EE] Sensors
>
> I'm starting a project to create an outdoor environmental recorder as a
> hobby. Looking for water sensor recommendations that can be used with PIC's
> for data gathering and interfacing with a SBC.
>
> Prefer to keep the costs down as much as possible; so far the few sensors
> I've found (pH, temperature, conductivity, dissolved oxygen) have been
> extremely expensive ($300-700 each).
>
> Any tips or ideas? Might be to expensive for a hobby project.
>
> -Josh
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