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saltwater PH meter design

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aliyesami

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can anyone guide me how to interface one of these PH probes sold in market to measure salt water PH levels ?

thanks
 

can you help me explain this circuit ? i dont understand why there are two batteries ? and also which potention meter play what role in tuning
 

does the circuit suit your requirements ..
make sure you know what you want to make before finalizing a particular circuit

for your question .. the 2 batteries are meant to give positive and negative supply to the opamp
and the potentiometer (you wouldnt ask this question if you had enough knowledge of opamps) provides offset trimming.
 

hi thanks for your help . yes this circuit suits my requirement but iam not still not sure how I will tune it to a particular PH value. can you please guide ?
 

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