In the experiment and detection work, the calorimeter is the key equipment for accurately measuring the heat of substances, but the abnormal value of the calorimeter occurs from time to time, which seriously affects the accuracy of the experimental results. Below, we will analyze the reasons in detail.

Equipment itself

1. Sensor failure: If the temperature, pressure and other sensors of the calorimeter are aged or damaged, it will lead to data collection deviations. For example, the sensitivity of the temperature sensor decreases, and the heat change cannot be accurately captured, which will make the value abnormal.

2. Component wear: After long-term use, the stirring device, heating element and other components inside the calorimeter are worn, which affects the heat transfer and measurement stability, causing numerical fluctuations.

Improper operation factors

1. Sample handling problems: too much or too little sample, insufficient drying of the sample, and uneven mixing of the sample and the accelerant will all cause the combustion reaction to be insufficient, causing the measured value to deviate from the true value.

2. Operation process error: Failure to strictly follow the operating procedures for instrument preheating and calibration, or frequent opening of the instrument during the measurement process, interfering with the measurement environment and causing numerical abnormalities.

Effect of environmental conditions

1. Temperature fluctuations: The laboratory temperature is unstable, which will change the heat dissipation or heat absorption of the calorimeter, affect the heat balance, and cause deviations in the measurement value.

2. Humidity interference: Excessive ambient humidity may damp the internal components of the instrument, affecting the circuit performance, which in turn affects the measurement accuracy and causes numerical abnormalities.

Missing calibration and maintenance

1. Not regularly calibrated: After the calorimeter is used for a long time, the measurement accuracy will gradually decrease. If it is not calibrated in time, the measurement results will inevitably be inaccurate, and numerical abnormalities will be unavoidable.

2. Insufficient cleaning and maintenance: The accumulation of dust and debris inside the instrument will affect the heat transfer and the normal operation of the components, resulting in abnormal measurement values.

When encountering an abnormal value of the calorimeter, it can be checked one by one from the above aspects. First check the appearance and components of the equipment, then review the operation process, pay attention to the environmental conditions, and finally ensure that the instrument is regularly calibrated and cleaned. Through accurate investigation, solve the problem in time to ensure the reliability of the measurement results of the calorimeter.