As a key device for accurately measuring the heat of a substance, the standardization of its setting directly affects the accuracy of the test results. The following is a detailed introduction to the setting method of the calorimeter to help you get started quickly.

First, prepare before starting

Before turning on the calorimeter, make sure that the instrument is placed smoothly, there is no strong magnetic field interference around, and the power supply voltage is stable, which meets the rated voltage requirements of the instrument. At the same time, check whether the oxygen bomb, inner cylinder and other components of the calorimeter are in good condition, damaged or loose, and ensure that the instrument is in good standby state.

II. Preliminary setting of parameters

Turn on the power of the calorimeter and enter the operation interface. Set key parameters according to the characteristics of the sample to be tested. For example, according to the estimated calorific value of the sample, set the measurement range of the calorimeter reasonably to avoid measurement errors due to improper range setting. In addition, for the constant temperature calorimeter, set the appropriate inner cylinder water temperature. Usually, the inner cylinder water temperature is 1-2 ° C lower than the outer cylinder water temperature to ensure the stability of the measurement process.

Oxygen bomb charging setting

The oxygen bomb is one of the core components of the calorimeter, and the oxygenation process is crucial. Put the oxygen bomb loaded with the sample into the calorimeter and connect the oxygenation device. Set the oxygenation pressure, generally controlled at 2.8-3.0MPa, and the oxygenation time is set at 15-20 seconds to ensure that the oxygen bomb is sufficient to provide sufficient oxygen for the complete combustion of the sample. After the oxygenation is completed, check again whether the oxygen bomb is well sealed to prevent air leakage from affecting the measurement results.

IV. Calibration and calibration settings

In order to ensure the measurement accuracy of the calorimeter, regular calibration and calibration are required. Standard benzoic acid and other standard materials are selected, and calibration parameters are set according to the instrument operating procedures. Put the standard material into the oxygen bomb for combustion measurement, and compare the measurement results with the standard value to calibrate and adjust the instrument to ensure the measurement accuracy of the calorimeter.

Sample measurement settings

After completing the above settings, the sample can be measured. Put the processed sample into the oxygen bomb and start the measurement program according to the set parameters. The calorimeter will automatically complete the combustion, heat measurement and other processes, and display the measurement results. After the measurement, record the data in time, and clean and maintain the instrument to prepare for the next measurement.

Mastering the setting method of the calorimeter is the key to ensuring the accuracy of the test results. By strictly following the above steps and setting various parameters in a standardized manner, the heat measurement work can be completed efficiently and accurately, providing reliable data support for scientific research and production.