The calibration of a portable ammonia nitrogen analyzer is a key step in ensuring accurate measurement of ammonia nitrogen concentration. The following are the general calibration steps, which may vary depending on different models of instruments. Therefore, it is best to refer to the instructions in the instrument manual for detailed operation steps:
1. Preparation of calibration solution: Prepare an appropriate concentration of ammonia nitrogen calibration solution according to the specifications and requirements of the instrument. Usually, you need to prepare a low concentration and a high concentration calibration solution.
2. Check the instrument: Before starting calibration, ensure that the instrument is in good condition, with sufficient battery power, clean sensors, and in appropriate temperature and humidity conditions.
3. Calibration mode: Set the instrument to calibration mode, which can usually be found in the instrument's menu or settings. Start the calibration program.
4. Use low concentration calibration solution: Use a low concentration calibration solution and place it in the measurement chamber or sample cell of the instrument. Ensure that the calibration solution is in contact with the sensor of the instrument.
5. Perform calibration: After starting the calibration program, the instrument will measure the ammonia nitrogen concentration of the calibration solution. Depending on the requirements of the instrument, you may need to manually enter the concentration of the calibration solution or select a preset calibration solution.
6. Calibration confirmation: The instrument will display the calibration results. Confirmation of successful calibration usually indicates successful calibration.
7. Use a high concentration calibration solution: Repeat the above steps and perform a second calibration using a high concentration calibration solution.
8. Calibration record: Record the date, time, concentration of the calibration solution, and calibration results of the calibration. These records are typically used for quality control and data traceability.
9. Exit calibration mode: After completing calibration, exit calibration mode and switch the instrument back to normal measurement mode.
10. Measurement: After ensuring that the instrument has been successfully calibrated, the actual measurement of ammonia nitrogen concentration can begin.
Calibration is an important step in ensuring the measurement accuracy of portable ammonia nitrogen analyzers. Regular calibration, especially before use or important measurements, can ensure that the instrument provides accurate measurement results. Please always refer to the instrument instructions for operation.
