The temperature inside the graphite high-temperature vacuum furnace does not match the actual temperature
05-23-2025 Author: KJ technology
The inconsistency between the furnace temperature of graphite high-temperature vacuum furnace and the actual temperature may be caused by various factors. The following are specific analysis and solutions:
1. Cause analysis
Temperature sensor issue:
Damage or aging: The temperature sensor may be damaged or aged after prolonged use, resulting in inaccurate measurements.
Improper installation position: The temperature sensor is not installed in an area where the furnace temperature is evenly distributed, which may result in a deviation between the measured value and the actual temperature.
Control system issues:
Software malfunction or parameter setting error: The software of the control system may have a malfunction, or the PID parameters may be improperly set, resulting in inaccurate temperature control.
Solid state relay output breakdown: The breakdown of the output terminal of the solid state relay may cause abnormal heating power, which in turn affects the furnace temperature.
Furnace environment issues:
Impurities or carbon deposits in the furnace: The presence of impurities or carbon deposits in the furnace may affect heat conduction and temperature distribution, leading to inaccurate temperature measurement.
Poor sealing: Poor sealing of the furnace may cause heat loss and affect the furnace temperature.
External environmental impact:
Environmental temperature fluctuations: Changes in external environmental temperature may have an impact on furnace temperature.
Unstable power supply voltage: Fluctuations in power supply voltage may also affect the accuracy of temperature control.
2. Solution method
Check and replace the temperature sensor:
If the temperature sensor is found to be damaged or aged, it should be replaced with a new sensor in a timely manner and its installation position should be ensured to be correct.
Adjust control system parameters:
Adjust the PID parameters of the control system according to the actual situation to achieve better temperature control effect.
Check and correct the software settings of the control system to ensure that the parameter settings are correct and error free.
Cleaning the furnace:
Regularly clean the impurities and carbon deposits in the furnace, maintain the cleanliness of the furnace environment, and ensure uniform heat conduction and temperature distribution.
Check and repair the sealing of the furnace:
Check if the sealing of the furnace is good to prevent heat loss. If poor sealing is found, it should be repaired in a timely manner.
Stable power supply voltage:
Ensure stable power supply voltage, and if necessary, install voltage regulators and other equipment to reduce the impact of voltage fluctuations on temperature control.
Adopting verification method:
Some simple verification methods can be used to determine whether the furnace temperature and displayed temperature are consistent, such as using substances with known melting points (such as NaOH, anhydrous Na ₂ CO ∝, etc.) for verification.
