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Looking for pH water meter schematics

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mostrengo

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ph meter

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

thank you
 

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
 

Hello,

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

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
 

ph meter

hi all

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

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