Common faults and solutions of desktop mini tube furnace

The common faults and corresponding solutions that may occur during the use of desktop mini tube stoves are as follows:

1. Power supply and display malfunction
No power display on the instrument after power on
Possible reasons: improper plug insertion, blown fuse, blown control circuit fuse.
Solution: Check if the plug is plugged in or connected properly; Replace the fuse; Check for short circuits, eliminate them, and replace the fuse.
The instrument is outputting normally, but the OUT indicator light is not flashing
Possible reasons: The main circuit has malfunctioned, such as a short circuit in the resistance wire or an uncontrollable heating element.
Solution: Check if the resistance wire is short circuited, if the heating element is controllable, and replace the resistance wire or temperature controller if necessary.

2. Temperature control malfunction
The temperature inside the furnace does not rise
Possible reasons: Low set temperature, damaged control circuit, damaged heating element.
Solution: Adjust the set temperature; Notify professional maintenance personnel to inspect and control the circuit; Replace the heating element.
The set temperature does not match the temperature inside the furnace
Possible reasons: Damage to temperature sensors or temperature controllers, deviation between temperature measurement points and layout points.
Solution: Replace the temperature sensor or thermostat; Set the layout position correctly.
When heating up, the temperature display does not increase but instead decreases
Possible reason: The positive and negative poles of the thermocouple are reversed.
Solution: Swap the positive and negative wiring of the thermocouple.
Large temperature fluctuations
Possible reasons: Unreasonable PID parameter settings in the temperature control system, thermal inertia of heating elements, and changes in ambient temperature.
Solution: Adjust PID parameters; Adopting segmented heating and slow heating methods to reduce the impact of thermal inertia; Place the tube furnace in a relatively stable temperature environment or perform appropriate insulation treatment.

3. Heating element and furnace tube malfunction
Heating element fracture
Possible reasons: Heating element aging, external impact.
Solution: Open the furnace door, observe the broken heating element and replace it.
Furnace tube rupture
Possible reasons: External force impact, prolonged high temperature thermal expansion and contraction leading to internal stress, and excessive pressure changes inside the furnace tube.
Solution: Avoid external impact on the furnace tube; Choose suitable furnace tube materials and reasonable installation methods; Control the inflow rate of gas to avoid sudden increases in gas flow.
Furnace tube leakage
Possible reasons: aging and damage of the sealing gasket, and looseness of the furnace tube connection.
Solution: Replace aging or damaged gaskets in a timely manner; Use tools such as wrenches to tighten the connecting bolts, but avoid overtightening.

4. Other faults
Decreased vacuum degree
Possible reasons: Aging of temperature resistant silicone rings between stainless steel flanges and damage to the vacuum system.
Solution: Replace the heat-resistant silicone ring or reinstall the stainless steel flange; Repair or replace the vacuum system.
The rapid heating rate in the low-temperature section leads to material spraying
Possible reason: Insufficient consideration was given to the physical and chemical properties of the sintered material, and the heating rate was set too fast.
Solution: When setting the heating rate, the physical and chemical properties of the sintered material should be fully considered to avoid excessive heating rate in the low-temperature section.