This pH sensor is a combination electrode that provides a voltage proportional to the pH of the tested solution, with pH 7 corresponding to the voltage reference of 2.048V of the circuit (assuming connection to a Waspmote system), with an uncertainty of ±0.25pH. The value is obtained by reading the output voltage with an analog-to-digital converter, then performing a conversion routine to get a pH value.
To get an accurate value from the sensor, 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.
pH Sensor Features
- Type: Combination electrode
- Range: 0 to 14 pH
- Operating Temperature: 0 to 80 °C
- Zero Electric Potential: 7±0.25p
- Response Time: Less than 1 minute
- Internal Resistance: ≤250MΩ
- Repeatability: 0.017
- PTS: Greater than 98.5
- Noise: Less than 0.5mV
- Alkali Error: 15mV
- Reader Accuracy: Up to 0.01 (when calibrated)
Compatible with Waspmote This sensor can be used in a Waspmote wireless sensor platform by plugging it into the Waspmote Smart Water Sensor Board. The Smart Water Sensor Board includes an adapter from BNC to RP-SMA so you can connect this sensor to it.