Preparation before calorimeter adjustment

Before adjusting the calorimeter, ensure that the instrument is in good operating condition. Check whether the power connection is stable and whether the appearance of the instrument is damaged. At the same time, prepare reference materials, such as benzoic acid with known calorific value, which is the key to subsequent calibration. In addition, ensure that the laboratory environment temperature is stable to avoid temperature fluctuations from interfering with the measurement results.

Calibration operation of calorimeter

Calibration is the core link of the adjustment of the calorimeter. Put an appropriate amount of standard benzoic acid into the burning dish, accurately weigh it and fill it with oxygen bomb, and fill it with enough oxygen. Put the oxygen bomb into the inner barrel of the calorimeter and start the measurement procedure according to the operation process of the instrument. After the measurement is completed, the calibration parameters of the instrument are set according to the calorific value of the standard material and the actual measured value. If the measured value deviates greatly from the standard value, it needs to be adjusted repeatedly until the measurement results meet the requirements.

Parameter setting and optimization

In addition to calibration, the parameter setting of the calorimeter is also crucial. According to the sample characteristics and measurement needs, the ignition temperature, stirring speed and other parameters can be reasonably set. For example, for refractory samples, the ignition temperature can be appropriately increased; in order to ensure the uniformity of measurement, the stirring speed can be reasonably adjusted. At the same time, regularly check the sensor of the instrument to ensure its sensitivity and avoid measurement errors caused by sensor failure.

Daily maintenance and inspection

The accurate adjustment of the calorimeter is inseparable from daily maintenance. After each use, clean up the combustion residue in time to keep the inside of the instrument clean. Regularly check the tightness of the oxygen bomb and the contact of the electrodes to ensure the smooth ignition. In addition, according to the requirements of the instrument manual, regularly conduct a comprehensive inspection and maintenance of the instrument to prolong the service life of the instrument and ensure the measurement accuracy.

Through the above steps, mastering the adjustment method of the calorimeter can effectively improve the measurement accuracy and provide reliable data support for experiments and production.