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CN0359 Measure Conductivity Discussion

Question asked by lee_trieu on Jun 30, 2016
Latest reply on Jun 30, 2016 by R.L

Hello everybody !

I'm follwing CN0359 circuit in oder to measure conductivity of water.

I have some problem with this circuit:

1) My system always return 130.45 C degree when i don't connect PT1000 to J3. Seem, this temperature value is R13 (1.5KR) inside CN0359.

2) When my system operating, both AD8253ARMZ(U15-A and U18-A) ICs very hot(Whitout Conductivity cell).

Please give me some suggestions !

Thanks all !