Thermal analyzers are devices used to study the physical and chemical properties of materials under different temperature conditions and are widely used in many fields such as materials science, chemistry, pharmaceuticals, and food science. The core of thermal analyzers lies in their ability to accurately measure the thermal behavior of samples under different temperatures, such as thermogravimetry (TG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). To ensure the accuracy of these measurement results, temperature calibration technology and accuracy assurance are particularly important. The following is an overview of some key points regarding the temperature calibration technology and accuracy assurance of thermal analyzers.
1. Temperature calibration methods
Standard substance method: Calibrate using known thermal behavior standard substances, such as the thermal expansion coefficient of iron. By measuring the thermal behavior of the standard substance and comparing it with the expected value, adjust the temperature control system of the thermal analyzer.
Thermocouple calibration: Compare the thermocouple with a standard thermometer to ensure that the temperature values output by the thermal analyzer are consistent with the actual temperature.
Self-calibration function of thermal analyzers: Some thermal analyzers have automatic calibration functions, which can be automatically calibrated through built-in standard samples, simplifying the operational process.
2. Key points of accuracy assurance
Regular calibration: Regularly calibrate thermal analyzers to ensure their long-term stability and accuracy.
Environmental control: Ensure that thermal analyzers operate in a stable environment to avoid the impact of temperature fluctuations on measurement results.
Use calibration curves: Use calibration curves to correct measurement results during temperature measurement to improve measurement accuracy.
Maintenance and care: Regularly maintain and care for thermal analyzers, including cleaning and checking sensors, to ensure that the instrument is in good condition.
Use high-quality samples: Ensure the quality and uniformity of the samples to avoid deviations in measurement results caused by sample issues.
3. Other considerations
Training operators: Ensure that operators understand the operation methods and calibration steps of the instrument to avoid measurement errors caused by improper operation.
Recording and reporting: Detailed records of the calibration process and results, as well as observations and findings from daily use, facilitate the traceability and improvement of problems.
In summary, the temperature calibration and accuracy assurance of thermal analyzers is a systematic project that requires comprehensive consideration and management from multiple aspects, such as the selection of calibration methods, compliance with operational specifications, and environmental control. These measures can effectively improve the measurement accuracy of thermal analyzers and ensure the reliability and scientific nature of experimental data.
