Temperature measurement is critical in many processes, such as determining whether a reaction is complete and ensuring product quality. However, errors can easily occur due to heat transfer, convection, and other factors. What are the main causes?
1. Measurement location
In a static, open reaction tank, the temperature at the bottom differs from that at the top. Readings near the edges differ from those near the center, and temperatures close to the heat source differ from those farther away.
2. Presence of stirring
If the reaction tank is well stirred and fully uniform, temperature measurement is no longer affected by the measurement location.
3. Open or closed reaction tank
In an open reaction tank, the measured medium is directly exposed to the environment, making it susceptible to external factors such as wind speed and air convection.
4. Excessive use of thermowells
To avoid interrupting operations when replacing a thermometer, thermowells are often fixed at the measurement point. However, if a thermometer with its own thermowell is installed into another thermowell, multiple layers are created, which reduces measurement accuracy.
