Looking for pH water meter schematics

[mostrengo]

ph meter

I need links for schematics for a pH water meter for aquariums

thank you

 

[House_Cat]

Here are links to a couple of schematics. The first one looks like the best of the two.


h**p://www.lce.org/equipment/phmeter/phoper.html

h**p://www.cyberreefguru.com/electronics/index.html

 

[jjchl]

Hello,

The PH probe give you an equivalent voltage. You must amplify the signal from the PH probe and compensate it.

 

[Roscoe]

Hi jjchl,

the input resistance for the ph Meter must by verry hig. The ph electrode has an output resistance in the range of minimum 200 M-ohms, or more.

You must use an input OP with very low current and low bias.

Next week ( i'm in hollydays and not in the office) i can send you a schematic of a industrial ph preamp.

Send me pm if you are interested for this.

roscoe

 

[majid_valentine]

ph meter

hi all

i need a digital flow meter circuit can any body help me????