In the experimental detection work, the measurement accuracy of the calorimeter is very important. Once the measurement results are low, it will directly affect the accuracy of the data. The following is a detailed introduction to the adjustment method of the calorimeter low, which helps to solve the problem quickly.

First, check the external environment and basic settings

First, check the environment where the calorimeter is placed. Make sure that the instrument is placed on a stable, dry and non-strong electromagnetic interference workbench to avoid measurement deviations due to vibration, humidity or electromagnetic effects. At the same time, confirm that the power supply voltage is stable and meets the rated voltage requirements of the instrument. Voltage instability will cause abnormal operation of internal components of the instrument, which will lead to low measurement results. In addition, check the grounding of the instrument. Good grounding can reduce external interference and ensure stable operation of the instrument.

Second, the core components of the calibration instrument

Calibration of the core components of the calorimeter is the key to solving the problem of low. Oxygen Bomb Calibration: Oxygen bomb is a key component of the calorimeter. If the oxygen bomb is not tightly sealed or the oxygenation pressure is insufficient, it will lead to insufficient combustion and low measurement value. It is necessary to check whether the sealing ring of the oxygen bomb is aging or damaged, and replace it in time; at the same time, use a standard pressure gauge to calibrate the oxygenation pressure of the oxygen bomb to ensure that the pressure meets the requirements of the instrument manual, usually about 3.0MPa. Temperature Sensor Calibration: The temperature sensor is the core of the measurement temperature. If the sensor is deviated, it will directly lead to inaccurate measurement results. Use a standard thermometer to calibrate the sensor. If the deviation exceeds the allowable range, the sensor reading should be corrected by adjusting the calibration parameters inside

III. Standardize sample handling and loading

The way the sample is handled and filled can also affect the measurement results. Sample drying treatment: ensure that the sample is fully dry. If the sample contains moisture, the evaporation of the moisture during combustion will absorb heat, resulting in a low measurement value. The sample can be placed in a drying oven, dried at standard temperature and time, and then weighed after cooling. Sample loading specification: When weighing the sample, strictly follow the weighing range required by the instrument to avoid too much or too little sample; when filling the sample, ensure that the sample is evenly distributed at the bottom of the crucible and does not exceed the edge of the crucible to prevent the sample from splashing during combustion, which will affect the combustion effect and measurement accuracy.

Fourth, troubleshoot the internal system failure of the instrument

If after the above steps are completed, the calorimeter still has a low problem, it is necessary to check the internal system failure of the instrument. Check the ignition system to see if the ignition wire is in good condition and the connection is firm. If the ignition wire is aging or in poor contact, it will lead to ignition failure or incomplete combustion, resulting in low measurement results. It is necessary to replace the ignition wire in time and ensure reliable connection. At the same time, check the circulating water system of the instrument to ensure that the circulating water flow is stable and the water temperature is constant. If the circulating water system fails, it will affect the heat transfer and lead to measurement deviation. It is necessary to clean the pipeline and check the water pump to ensure the normal operation of the circulating water system.

Through the system investigation and adjustment of the above steps, most of the problems of low calorimeters can be effectively solved. If it still cannot return to normal after adjustment, it is recommended to contact the professional and technical personnel of the instrument manufacturer for maintenance to ensure the accurate operation of the instrument and ensure the smooth development of the experimental testing work.