Selecting The Right pH Sensor For Your Application
The term “pH level” refers to the measurement of a liquid’s acidity or alkalinity using an instrument called a pH meter. They operate by determining the electrical potential difference between two electrodes submerged in the liquid being tested: a reference electrode and a measuring electrode. The measuring electrode is normally made of glass, while the reference electrode is commonly made of silver/silver chloride or calomel.
Temperature, pressure, viscosity, and the presence of other ions in the liquid are some of the variables that have an impact on the pH sensor reading. Therefore, it is essential to guarantee that the pH sensor is properly calibrated and that measurement conditions are consistent and stable.
Ensuring that the pH sensor has a solid reference junction, such as the Nexus solid reference junction, is important to protect the sensor from reference poisoning. The reference junction is responsible for maintaining a stable reference potential in the sensor, which is necessary for accurate pH sensor readings. The Nexus solid reference junction is made of a proprietary material that is highly resistant to contamination and can withstand harsh environments.
Reference poisoning can occur when the reference electrode becomes contaminated with materials that are not supposed to be in the liquid being tested, such as salt or other dissolved ions. This can lead to inaccurate pH sensor readings and even damage the sensor. By using a solid reference junction, the risk of reference poisoning is greatly reduced, which helps to ensure the accuracy and longevity of the pH sensor.
Regular inspection and cleaning of the pH sensor is also important to ensure accurate readings and prolong the life of the sensor. This includes inspecting the sensor for any physical damage or contamination, as well as cleaning the electrodes with a suitable cleaning solution. It is also important to check that the sensor is properly calibrated and that the measurement conditions are stable and consistent.
Additionally, it is important to use a reference electrode that is compatible with the liquid being tested and to replace the reference electrode if it becomes contaminated or damaged. Proper maintenance of the pH sensor, including regular inspection and cleaning, can help to ensure that the sensor provides accurate readings and has a long service life.
A pH sensor might malfunction for a number of reasons. Reference poisoning, which happens when the reference electrode becomes polluted with substances that shouldn’t be in the liquid being tested, is one of the most frequent reasons for failure. This may even harm the sensor and result in erroneous pH sensor readings. The reference electrode must be kept clean and free of impurities in order to avoid reference poisoning. Using a reference electrode that is compatible with the liquid being tested is also essential.
Other reasons pH sensor malfunction include:
Aging of the electrode: As the glass electrode ages, readings may become erroneous.
Damage to the electrode might occur physically or as a result of exposure to substances that are incompatible with the sensor.
Poor calibration: Inaccurate results may result from improper calibration of the sensor.
It is crucial to adhere to regular maintenance measures and make sure that the sensors are utilized in the right circumstances if you want to ensure accurate pH readings and extend the life of your pH sensor.
Learn more about analytical sensors
Please contact us to discuss your application
