Preparation before calibration

Before calibrating the Yinghua calorimeter, adequate preparation is the basis for ensuring that the calibration is carried out smoothly. First, ensure that the calibration environment is stable, the temperature is controlled between 15-30 ° C, and the humidity is maintained at 40% - 70% to avoid environmental factors interfering with the calibration results. At the same time, prepare the reference material, such as benzoic acid, whose calorific value is accurate and stable, which is an ideal choice for calibrating the calorimeter. In addition, it is also necessary to check the appearance of the instrument to ensure that the components are connected normally without damage or loosening.

Specific calibration steps

1. Instrument preheating: Connect the power supply of Yinghua calorimeter, turn on the instrument, and let it preheat for about 30 minutes. Preheating can make the internal components of the instrument reach a stable working state and reduce the measurement error caused by temperature changes.

2. Sampling operation: Use an accurate balance to weigh an appropriate amount of standard benzoic acid and press it tightly into the burning dish at the bottom of the oxygen bomb. Note that the sample loading process should avoid spilling the sample and ensure that the sample is evenly distributed. Next, add an appropriate amount of distilled water to the oxygen bomb, and then tighten the oxygen bomb cap to ensure a good seal.

3. Parameter settings: Open the instrument operation interface and set relevant parameters according to the actual situation, such as ignition temperature, test time, etc. The parameter settings of different models of Yinghua calorimeters are slightly different, so you need to refer to the instrument manual for accurate settings.

4. Start calibration: Put the oxygen bomb loaded with the sample into the measurement chamber of the calorimeter, close the lid of the instrument, and click the "Start Calibration" button. The instrument will automatically complete the ignition, measurement and other processes, and record relevant data.

5. Data recording and calculation: After the calibration is completed, record the measured calorific value displayed by the instrument. Compare the measured calorific value with the known calorific value of standard benzoic acid and calculate the error value. If the error is within the allowable range, the calibration is successful; if the error exceeds the range, the calibration operation needs to be re-performed.

Precautions after calibration

After the calibration is completed, the instrument should be cleaned and maintained. Clean up the residual substances in the oxygen bomb and measuring chamber to keep the inside of the instrument clean. At the same time, the instrument should be checked and maintained regularly to ensure its long-term stable operation. In addition, each calibration should record the calibration time, reference material information, calibration results and other data in detail for subsequent inquiry and traceability.

Mastering the calibration method of Yinghua calorimeter can not only ensure the accuracy of measurement results, but also prolong the service life of the instrument. By strictly following the above steps, you can easily complete the calibration work and provide reliable guarantee for experiments and inspections.