What is the reason for the inconsistency between the displayed temperature and the set temperature of the box type atmosphere furnace?

The reasons for the inconsistency between the displayed temperature and the set temperature of the box type atmosphere furnace may involve multiple aspects. The following are some possible reasons and explanations:
1. Temperature sensor issue
Accuracy and response speed: The accuracy and response speed of temperature sensors (such as thermocouples or thermistors) are directly related to the accuracy of temperature measurement. If the accuracy of the temperature sensor is low or the response speed is slow, it may cause a deviation between the measured temperature and the actual temperature.
Malfunction and damage: The temperature sensor may fail due to open circuits, short circuits, or signal transmission faults, resulting in inaccurate temperature measurements.
Inappropriate placement: If temperature sensors such as thermocouples are placed improperly inside the furnace, it can also affect their measurement accuracy, resulting in a discrepancy between the displayed temperature and the set temperature.
2. Control system issues
PID parameter setting: PID control is a commonly used temperature control method for box type atmosphere furnaces. If the PID parameters are not set properly, it will affect the accuracy and stability of temperature control, resulting in a deviation between the displayed temperature and the set temperature.
Control software and hardware failures: Control software errors or controller hardware failures may also cause abnormal temperature control, thereby affecting the consistency between displayed temperature and set temperature.
3. Heating element issue
Heating element damage: If the heating element is damaged or aged, it will result in insufficient heating power, which will affect the actual temperature rise inside the furnace and deviate from the set temperature.
Uneven distribution: If the distribution of heating elements in the furnace is uneven, it will lead to an uneven temperature field in the furnace, thereby affecting the overall temperature control accuracy and causing the displayed temperature to be inconsistent with the set temperature.
4. Furnace body and environmental factors
Sealing performance of furnace body: Poor sealing performance of furnace body can lead to heat dissipation or external atmosphere interference, affecting the stability and accuracy of furnace temperature, resulting in inconsistency between displayed temperature and set temperature.
Environmental factors: Whether the equipment is installed horizontally and stably, as well as the temperature, humidity, electromagnetic interference, etc. of the surrounding environment, may indirectly affect the accuracy and stability of temperature control inside the furnace.
5. Operation and setting issues
Improper operation: Operators may set temperatures that do not match actual requirements or fail to correctly set parameters such as heating curves due to misoperation or lack of understanding of equipment characteristics.
Equipment aging: Long term use of equipment may lead to performance degradation, including decreased accuracy and stability of components such as temperature sensors, heating elements, and control systems.
In summary, the reasons for the inconsistency between the displayed temperature and the set temperature of the box type atmosphere furnace may involve multiple aspects such as temperature sensors, control systems, heating elements, furnace body and environmental factors, as well as operation and setting issues. When solving such problems, possible causes should be investigated one by one, and corresponding solutions should be taken to ensure the normal operation of the equipment and the accuracy of temperature control. If the problem is complex or difficult to solve, it is recommended to contact the equipment manufacturer or professional maintenance personnel for handling.