The Importance of Reverse Calibration of calorimeter

When a calorimeter detects the calorific value of a substance, accuracy is crucial. With the increase in use time, environmental changes and other factors, the instrument may have errors. Anti-calibration is to recalibrate the instrument through the standard material to ensure the reliability of the test results and provide accurate data support for experiments and production.

Preparation before anti-calibration

1. Selection of reference materials: Standard benzoic acid with proven and good stability is selected, and its calorific value is accurate and uniform, making it an ideal material for reverse calibration.

2. Instrument status inspection: check the sealing of the oxygen bomb of the calorimeter to ensure that there is no air leakage; check the ignition device, temperature measurement system and other components to ensure the normal operation of the instrument. At the same time, clean the inside and outside of the oxygen bomb to avoid impurities affecting the combustion effect.

Specific operation steps of anti-calibration

1. Sampling and installation: accurately weigh an appropriate amount of standard benzoic acid, press it tightly into the combustion dish, connect the ignition wire, and ensure good contact. Put the combustion dish into the oxygen bomb, put it into the inner cylinder of the calorimeter after loading, inject an appropriate amount of distilled water, and cover the instrument.

2. Parameter setting and start-up: According to the reference material information, set relevant parameters in the instrument program, such as quality, calorific value, etc. Start the calorimeter, the instrument automatically completes the ignition, temperature measurement, calculation and other processes, and records the entire process data.

3. Data calculation and adjustment: After the measurement, the comparison instrument shows the calorific value and the true calorific value of standard benzoic acid. If the deviation exceeds the allowable range, adjust the instrument parameters according to the calibration formula in the instrument manual until the multiple measurement results are stable and meet the requirements.

Verification and maintenance after anti-calibration

After the anti-calibration is completed, it is tested again with another standard material to verify the calibration effect. In daily use, the calorimeter is regularly maintained, such as cleaning parts, checking the sealing, keeping the instrument in good condition, and ensuring the continuous and reliable detection accuracy.

Mastering the anti-calibration method of the calorimeter can effectively improve the accuracy of the instrument detection and build a solid data foundation for related work. Strictly following the steps can keep the calorimeter at its best performance.