Analog PH Sensor Kit

The power of Hydrogen in any liquid can be measured with a total pH scale range of 0-14 where 7.0 is considered as a neutral value.The pH electrode has a single cylinder that allows direct connection to the input terminal of a pH meter, controller, or any pH device which has a BNC input terminal.You can just connect the pH sensor with a BNC connector, and plug the PH2.0 interface into any analog input on the Arduino controller to read pH value easily but you have to calibrate it before use if the pH probe was kept long. Calibration can be done via software or using a potentiometer present on the device.

As we can observe that in the circuit there are two knobs. One which is near the BNC connector probe is the one that regulates the offset, the other is the limit of pH.

In addition, we need to calculate the conversion of the voltage that will give us the pH sensor to what we will need two reference values of pH and measuring the voltage returned by the sensor on the pin Po. It is better to use a solution for calibration. These solutions are sold in different values, although the most common are pH 4.01, pH 6.86, and pH 9.18.

Using the envelopes with pH 4.01 and pH 6.86 we obtain the voltages on the pin Po 3.04 V and 2.54 V, respectively. The sensor is linear so that by taking two points, we can deduce the equation to convert the measured voltage to pH. The formula overall would be y=mx+b, so we have to calculate m and b as x would be the voltage e and the pH. The result is y=-5.70 x+21.34.