Common faults and solutions of heat treatment muffle furnace

During the use of the heat treatment muffle furnace, various faults may be encountered. Here are some common faults and their solutions:

1. Abnormal temperature
Fault phenomenon:
The furnace temperature display is inaccurate, fluctuates greatly, or exceeds the temperature limit.
resolvent:
Check if the thermocouple is inserted into the furnace and in good contact, and reinstall or adjust it if necessary.
Confirm that the scale mark of the thermocouple is consistent with the scale mark of the temperature control instrument. If they are not consistent, they need to be adjusted.
Check if the thermocouple is open or has poor contact, and replace the thermocouple or re tighten the wiring terminals if necessary.
Calibrate or replace temperature control instruments to ensure their accuracy.
Check if the solid-state relay is faulty, replace the relay if necessary, and inspect the control circuit.
If the furnace temperature exceeds the upper limit, it is necessary to check the cause of the overheating (such as sensor failure or poor heat dissipation) and restart after cooling down.

2. Heating malfunction
Fault phenomenon:
Some furnace wires are not red or the heating power is abnormal.
resolvent:
Check if the power supply voltage is stable. If it is unstable, adjust the voltage or replace the power cord.
Check whether the heating element (such as resistance wire, silicon molybdenum rod) is broken or aged, replace the heating element if necessary, and check the load power.
Check if the solid-state relay is damaged or if there is poor contact in the circuit. If necessary, replace the relay and repair the open circuit point.
Clean the carbon or oxide deposits on the surface of the heating element to maintain its good thermal conductivity.

3. Circuit issues
Fault phenomenon:
The controller is not functioning properly or displaying abnormally.
resolvent:
Check whether the switches, fuses, and travel switches of the furnace door inside the controller are intact, and repair or replace them if necessary.
Check if the external circuit interface of the controller is closed or poorly connected, ensuring reliable connection and good contact.
Check if the monitor cable is aging or has poor contact, and replace the cable or reinsert the interface if necessary.
Check if the power interface of the controller is disconnected or loose, ensuring that the power connection is normal.
Use instruments to test whether the power supply, circuits, and components inside the controller are normal. If there are any faults, they need to be repaired or replaced.

4. Other faults
Fault phenomenon:
There are obstacles or uneven placement of materials in the furnace.
resolvent:
Clean the obstacles inside the furnace to ensure that there are no debris in the furnace.
Adjust the material position to ensure even distribution and avoid local overheating or insufficient heating.

5. Maintenance suggestions
Regular inspection:
Clean the furnace every month, calibrate temperature control instruments, and test circuit connections.
Regularly inspect the wear and tear of heating elements, thermocouples, solid-state relays, and other components, and replace damaged parts in a timely manner.
Operating standards:
Avoid overload operation and ensure that the muffle furnace operates at rated load.
Do not abruptly plug or unplug thermocouples during high temperatures to prevent thermocouple damage or electric shock accidents.
Environmental requirements:
The equipment should be used in a dry and non corrosive gas environment to avoid damage caused by moisture and corrosion.

Through the above investigation and preventive measures, the stability and service life of the muffle furnace can be effectively improved. If encountering complex faults (such as damage to the control system), it is recommended to contact professional maintenance personnel for handling.