CN0326 measurement error

Hi.

I using kit CN0326 measurement pH and temperature connect SMT32f407. I using code reference CN0326 https://github.com/analogdevicesinc/EVAL-ADICUP360/blob/master/projects/ADuCM360_demo_cn0326/src/CN0326.c

I measurement it with voltage if supple DC Powe Supply KEYSIGHT E3632A, range 0 - 1170mV , result very well. channel 1( measurement Voltage,) channel 2(mes PT1000).

However i connect sensor pH Atlas or Hanna HI8424 result not stability, 

Please hepl me.

Thank you .

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