How to calibrate a COD analyzer

The calibration of COD water quality analyzer is a crucial step in ensuring the accuracy and reliability of its measurement results. The main calibration methods for COD analyzers include zero-point calibration, slope calibration, and multi-point calibration.

COD Analyzer Calibration Steps:

1. Prepare Standard Solution: Select a standard solution with an appropriate concentration range, ensure it is within its expiration date, and dilute or prepare it according to the instruction manual.

2. Check Instrument Status: Ensure the COD analyzer's sensor, light source, circuitry, and other components are functioning properly, and clean the optical components.

3. Perform Calibration: Inject the standard solution according to the operating procedures, record the instrument reading, and adjust the COD analyzer parameters based on the deviation.

4. Record Calibration Data: Record the calibration time, the concentration of the standard solution used, the instrument reading, and the adjusted parameters in detail.

5. Environmental Factors: Control environmental factors such as temperature and pH value to minimize their impact on the measurement results.

The calibration cycle should be set according to the frequency of use of digital COD analyzer and changes in water quality. Generally, it should be every quarter or every six months, but if the instrument is used frequently or environmental conditions change significantly, the calibration frequency needs to be increased.