The BOD intelligent water quality analyzer has demonstrated significant advantages in simultaneously measuring a large number of samples, with the ability to simultaneously measure 64 samples. This feature greatly meets the needs of scientific research, water quality monitoring, teaching experiments, and other fields for fast and synchronized measurement of large amounts of data. Specifically, this multi-channel design enables the intelligent water quality analyzer to process multiple samples in one experiment, greatly improving measurement efficiency. For example, in the field of water quality monitoring, when it is necessary to measure the BOD values of a large number of water samples, traditional methods may require a lot of time and manpower. However, using the LL-M3 BOD-Q water quality analyzer can complete the measurement of all samples in a short period of time, providing timely and accurate data support for water quality assessment and decision-making.

In addition, the instrument also has a highly automated feature, which can automatically complete the measurement process, including data acquisition, processing, and storage, further reducing the workload of experimental personnel. At the same time, its accuracy has reached a high level of ≥ 95%, ensuring the reliability and accuracy of the measurement results.

Calibrating the BOD intelligent water quality analyzer is a key step in ensuring the accuracy and reliability of its measurement results. The following are detailed calibration steps:

1. Check the status of the instrument

Ensure that the BOD analyzer has undergone routine maintenance and cleaning, and is not damaged or malfunctioning. Check if the measuring probe, electrodes, sensors and other components are intact, and confirm that the instrument is connected to the power supply and in a stable working state.

2. Prepare calibration solution

According to the requirements of the instrument manual, prepare a standard BOD solution as the calibration solution. Ensure that the calibration solution is within its validity period and stored as required. Meanwhile, prepare a calibration solution with known oxygen concentration for sensor calibration.

3. Sensor calibration

Install the sensor into the measuring slot and ensure proper connection with the instrument.

Open the BOD analyzer and enter sensor calibration mode.

According to the instrument instructions, place the sensor into a calibration solution containing a known oxygen concentration. Ensure that the calibration solution fully covers the sensor and wait for a period of time until the instrument displays that the sensor has been successfully calibrated.

After calibration is complete, remove the sensor from the calibration solution and place it back in its original position.

Confirm the calibration results displayed on the instrument and make necessary adjustments to ensure the accuracy of sensor calibration.

4. System parameter calibration

Temperature calibration: If the BOD analyzer has temperature control function, temperature calibration is required. Use a standard thermometer or temperature probe to compare it with the temperature sensor of the BOD analyzer, adjust the instrument temperature setting to match the standard temperature reading.

Mixing system calibration: Check whether the mixing system runs stably and can evenly mix water samples. Adjust the parameters of the mixing system according to the instrument operation manual or manufacturer's guidance to ensure that the water sample is fully mixed during the measurement process.

Measurement system calibration: Ensure that the optical sensor accurately measures the dissolved oxygen (DO) concentration in the water sample. Adjust the parameters of the measurement system according to the instrument operation manual or manufacturer's guidance to ensure the accuracy of the measurement results.

5. Zero point and slope calibration of BOD intelligent water quality analyzer

Zero point calibration: Set the BOD analyzer to zero point calibration mode, clean the measuring bottle with deionized water or distilled water, and ensure that there are no residual substances. Place the cleaned measuring bottle into the instrument, perform zero calibration according to the instructions in the instrument manual, and wait for the instrument to complete zero calibration to confirm whether the calibration result is qualified.

Slope calibration: Set the BOD analyzer to slope calibration mode and calibrate using standard BOD solution. According to the requirements of the instrument manual, take an appropriate amount of standard BOD solution and add it to the measuring bottle. Place the measuring bottle into the instrument, perform slope calibration according to the instructions in the instrument manual, and record the calibration results.

6. Evaluate and record calibration results

Check if the results of zero calibration, slope calibration, and temperature calibration are qualified. If the calibration result exceeds the range specified in the instrument manual, it should be recalibrated.

Record the calibration results in the instrument calibration record sheet, including data for zero point calibration, slope calibration, and temperature calibration. This will help track the calibration history and performance changes of the instrument.

Attach a calibration label to the calibrated instrument, indicating the calibration date and the reminder date for the next calibration.

7. Precautions

Before conducting BOD measurement, ensure that the collection and storage of water samples comply with standard methods to avoid prolonged exposure to air, which may cause changes in dissolved oxygen concentration.

Regularly clean and maintain the BOD analyzer to extend its lifespan and ensure the accuracy of measurement results.

During the measurement process, the temperature and stirring system of the water sample are strictly controlled to ensure the stability and reliability of the measurement results.