Required preparation before calibration

Before calibrating the Kaiyuan calorimeter, it is necessary to be fully prepared. First, ensure that the instrument is placed in a stable environment to avoid direct sunlight, strong magnetic field interference and large temperature fluctuations. The ideal ambient temperature is controlled at 15-30 ° C, and the humidity is maintained at 40% -70%. At the same time, carefully check the appearance of the instrument to see if the power cord and connecting wire are in good condition, and whether the various components are loose or damaged to ensure that the instrument is in normal operation. In addition, prepare standard materials that meet national standards and meet the accuracy standards, such as benzoic acid, whose purity must reach more than 99.99% and be certified by authoritative organizations, which is a key prerequisite for the accuracy of calibration.

Precise weighing of reference materials

Use a high-precision balance to weigh the standard material with a weighing accuracy of 0.1mg. To avoid weighing errors, wear clean gloves and special weighing paper during operation, and act gently and quickly to prevent the standard material from absorbing moisture or volatilizing. After weighing, carefully put the standard material into the oxygen bomb of the calorimeter, taking care not to spill it to ensure that the standard material participates in the reaction completely.

Calibration operation specification process

Install the oxygen bomb containing the standard material into the main body of the calorimeter, and connect the ignition wire and other components in strict accordance with the requirements of the instrument operation manual. Turn on the calorimeter, enter the calibration mode, and enter the calorific value and other parameters of the standard material according to the instrument prompts. After starting the calibration procedure, the instrument will automatically complete the ignition, measurement and other processes. During this period, pay close attention to the operation status of the instrument. If there is an abnormal alarm, the operation should be stopped immediately to investigate the cause of the failure.

Data logging and result determination

After the calibration is completed, the instrument will display the measurement results and record the calibration data in detail, including the quality of the standard material, the measured calorific value, the actual calorific value, etc. According to the relevant standards, calculate the measurement error. If the error is within the allowable range, the calibration is successful. If the error exceeds the range, re-check the calibration steps to find possible problems, and perform calibration again until the measurement results meet the requirements.

Post-calibration maintenance points

After the calibration, clean the instrument in time, remove the residual substances in the oxygen bomb, and wipe and maintain all parts of the instrument. Regularly check the performance of the instrument to ensure the long-term stable operation of the instrument. At the same time, establish a calibration file to record the time, results, operators and other information of each calibration, providing a basis for the maintenance and management of the instrument.

Mastering the calibration method of the Kaiyuan calorimeter can not only ensure the accuracy of the measurement data, but also prolong the service life of the instrument. Follow the above steps to standardize the calibration work and provide reliable support for experiments and production.