pH Sensor Probe

Sensor Specifications


Sensor type: Combination electrode
Measurement range: 0~14 pH
Temperature of operation: 0~80 ºC
Zero electric potential: 7±0.25 p
Response time: <1 min
Internal resistance: ≤250 MΩ
Repeatability: 0.017
PTS: >98.5
Noise: <0.5 mV
Alkali error: 15 mV
Reader accuracy: up to 0.01 (in function of calibration)


The pH sensor integrated in the Smart Water board is a combination electrode that provides a voltage proportional to the pH of the solution, corresponding the pH 7 with the voltage reference of 2.048 V of the circuit, with an uncertainty of ±0.25 pH. To get an accurate value from these sensors it is necessary both to carry out a calibration and to compensate the output of the sensor for the temperature variation from that of the calibration moment.