In the fields of energy and chemical industry, calorimeters are key equipment for accurately measuring the heat of substances, but errors in results often occur during use, which affects the accuracy of detection. Here are the common causes and countermeasures for you in detail.

Improper operation causes errors

The omission in the operation process is a major cause of error in the results. If the sample is not weighed accurately, such as the weight deviation exceeding 0.1mg, it will directly interfere with the heat calculation. At the same time, the sample is not standardized, such as the sample is not evenly filled and the seal is not tight, which will cause heat loss during combustion and distort the test results. In addition, the operator does not strictly follow the instrument preheating and calibration process, which will also greatly reduce the reliability of the data.

The equipment itself is faulty.

The equipment status of the calorimeter directly determines the accuracy of the results. If the oxygen bomb leaks and the electrodes are aged, it will lead to insufficient combustion and incomplete heat release. The inner cylinder water circulation system is blocked and the temperature sensor fails, which will cause temperature measurement deviations, which will then affect the heat calculation. If the instrument is not calibrated and maintained for a long time, the performance of key components will decline, and errors will continue to occur.

Environmental factors interference detection

The laboratory environment has a significant impact on the results of the calorimeter. If the indoor temperature fluctuates by more than ± 2 ° C, the balance of heat dissipation and insulation of the instrument is broken, which is easy to cause data fluctuations. Excessive humidity will cause the sample to become damp, change the combustion characteristics, and may also corrode the instrument parts. In addition, there is strong electromagnetic interference in the laboratory, which can also interfere with the signal transmission of the instrument, resulting in abnormal results.

Sample characteristics affect results

The characteristics of the sample itself cannot be ignored either. If the moisture content of the sample exceeds the standard, the water evaporates and absorbs heat during combustion, which will consume part of the heat, resulting in low results. Uneven samples and impurities will make the combustion process unstable and release heat fluctuations. Some special samples have high ignition points and incomplete combustion, which will also make the test results deviate from the true value.

In order to avoid errors in the results of the calorimeter, it is necessary to make efforts in four aspects: standardized operation, regular maintenance of equipment, stable environment, and control of sample quality, and accurately troubleshoot problems in order to ensure the accuracy and reliability of the test results.