Nexus The Solid Reference Junction pH Sensor
Ensuring that a pH sensor is equipped with a solid reference junction, also known as a “Nexus” reference junction, is crucial in protecting the sensor from reference poisoning. The Nexus reference junction is a proprietary thermoplastic material that separates the reference electrolyte from the sample electrolyte, which prevents the reference electrolyte from being contaminated by the sample electrolyte. This is particularly important in applications where the sample is known to contain potentially harmful contaminants, such as heavy metals or organic compounds, that can damage the reference electrode and cause reference poisoning.
Regular inspection and cleaning of pH sensors is also important to ensure accurate readings and prolong the life of the sensor. Inspection should include checking for any physical damage to the sensor, such as cracks or breaks in the electrodes, as well as checking for any signs of contamination or discoloration of the electrodes.
Cleaning should be done using a pH-neutral cleaning solution, such as a mild detergent, to remove any dirt or debris that may have accumulated on the electrodes. It is also important to ensure that the sensor is rinsed thoroughly with deionized water and dried before use.
In summary, it’s important to ensure that a pH sensor is equipped with a solid reference junction (Nexus junction), regular inspection and cleaning to protect the sensor from reference poisoning, as well as prolong the life of the sensor. This will improve the accuracy and reliability of pH readings, and prevent costly downtime due to sensor failure.
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