The temperature of the tube muffle furnace cannot rise

The temperature of the tubular muffle furnace cannot rise, which may involve multiple aspects such as software settings, hardware failures, power supply issues, furnace sealing, thermocouple accuracy, and operation methods. The following are detailed troubleshooting and solutions:

Software settings troubleshooting
Temperature control instrument parameter settings:
Check if the parameters such as DIH, OPL, SN, and OPH in the temperature control instrument are set correctly. For example, the DIH parameter should ensure that SV is displayed as the highest temperature that the device can reach; Incorrect OPL parameter settings may cause the device to fail to heat up properly, and it should be adjusted to the default value (such as 40); The SN parameter involves the model of the thermocouple and needs to be set correctly according to the equipment model; The OPH parameter is the percentage of the current input power limit. If the device cannot reach high temperatures or heats up slowly, the SV can be adjusted to 100.

Hardware troubleshooting
Heating element inspection:
Check whether the heating elements (such as resistance wires, silicon molybdenum rods, silicon carbon rods) are broken or damaged. If there is damage, a new heating element needs to be replaced.
Check if the connection points of the heating element are tightened to avoid a decrease in heating efficiency due to poor contact.
Power and Circuit Inspection:
Check the ammeter and voltmeter of the equipment to confirm if there is current and voltage supply. If there is no voltage or current and the Power indicator light is off, it may be a fault in the main circuit or a damaged fuse. The short circuit needs to be eliminated and the fuse needs to be replaced.
Check if the power supply of the power cord is sufficient and if the power cord connection is good. If the power supply is low or the power cord connection is poor, it is necessary to replace the high-power power cord and reconnect it.
Control circuit inspection:
If both the current and voltage are normal, but the heating element is intact, the problem may lie in the control circuit. At this point, professional electrical maintenance personnel are needed for further inspection and repair.
Other possible reasons and solutions
Power supply issue:
Check if the grid voltage is stable and sufficient. If the voltage is too low, it will result in insufficient heating power, thereby affecting the heating rate.
Check if the three-phase current is balanced. An imbalance value exceeding 20% may affect the normal operation of the equipment.
Furnace sealing:
Check the sealing condition of the furnace to ensure there is no air leakage. Poor sealing can cause heat loss and affect heating efficiency.
Thermocouple accuracy:
Check if the thermocouple is damaged or connected incorrectly. Thermocouples are used to measure temperature, and their accuracy and connection method directly affect the performance of temperature control systems. If the thermocouple is damaged or connected incorrectly, it needs to be replaced or reconnected.
Operation method:
Check if the loading amount is too high. Excessive loading will absorb a large amount of heat, resulting in a decrease in heating rate.
Check if the heating rate setting is reasonable. Excessive heating rate may lead to furnace cracking or material spraying; If the heating rate is too slow, it will affect the efficiency of the experiment. The heating rate should be set reasonably according to the physical and chemical properties of the sintered material.