Designing a pH sensor circuit

[jabezdavid]

Hi i Need to design a pH sensors circuit that could be interfaced with Basic stamp. i need some help from you

 

[IanP]

Re: pH electrode

You can get a pH-probe from for example aquarium shops ..
https://www.66pacific.com/ph/ph_probe.aspx
whereas the interface circuit you can construct by yourslf, here is an example:
https://www.66pacific.com/ph/phschematic.htm

This can also be helpful:
https://www.66pacific.com/ph/simplest_ph.aspx

And finally, this is an example of an interface of ph-probe with BasiStamp:
https://www.emesystems.com/OL2ph.htm

IanP

 

[jabezdavid]

Re: pH electrode

thank U for the link. i have a doubt in the circuit. what does it mean?? the one which I circled.

 

[karesz]

pH electrode

Hi,
"+6-12" means: used Positive supply between +6 and +12V.
"COM" means: Common or GND... (=Ref Potential for Supplies/Signals etc...)
K.

 

[jabezdavid]

Re: pH electrode

in the above circuit, RT1 is potentiometer and value is 10K ohms and what is 15T means. Is it mean 15 turns or 15% tolerance ???

 

[IanP]

Re: pH electrode

For precision you'll need a multiturn VR, so 15T means just that: 15-turn VR ..

IanP