Ammonia nitrogen sensors need more careful activation and storage than many general water quality sensors. If the sensitive membrane is not activated, is scratched, or is stored in the wrong solution, the reading can become slow or inaccurate.

Short Answer

For first-time use, soak the sensor in a 10 ppm electrode activation standard solution for 48 hours. During calibration, place the sensor in the standard solution, gently shake, and wait about 5 minutes until the reading stabilizes. For short-term storage, soak it in 10 ppm ammonium ion solution; for several days of storage, use the casing with protective solution.

First-Time Activation

A new NHN-Online-Ammonium-Nitrogen-Sensor.html">ammonia nitrogen sensor should be activated before normal measurement. The recommended method is to soak it in a 10 ppm activation standard solution for 48 hours so the electrode sensitive membrane can fully activate.

Skipping this step can cause slow response, unstable readings or large initial deviation.

Calibration Waiting Time

During zero-point and slope calibration, place the sensor in the correct vial or standard solution and wait about 5 minutes. The value should be stable before calibration is performed.

Gently shake the sensor during placement, then let it stand. If air bubbles remain inside the sensitive membrane area, gently tap the sensor housing to remove them.

Storage Rules Customers Should Follow

If the electrode will not be used for a short time, store it in a 10 ppm ammonium ion solution. If it will not be used for several days, store it in the casing with the built-in protective solution. Before next use, soak it in a 10 ppm solution for 24 hours to reactivate it.

Do not soak it in pure water for a long time. Do not touch the measuring membrane head with hard objects.

Unsuitable Environments

Avoid corrosive liquids or solutions that can corrode PVC, including strong acids. Do not place the sensor in ketone-containing or saturated organic compound solutions, such as tetrahydrofuran or protein solutions. Avoid strong electromagnetic radiation or nuclear radiation environments.

Long-term placement in complex liquids such as seawater or electroplating wastewater is not recommended unless the application has been evaluated carefully.

Related YexSensor PDF Guides

For calibration commands and model-specific handling notes, see the Water Quality Sensor Calibration and Usage Precautions PDF and the Water Quality Sensor Usage and Maintenance Instructions PDF.

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