Electrothermal vacuum drying oven common faults and troubleshooting methods

1

Vacuum can't pump

2

Large temperature fluctuations

3

Not warming up

4

Temperature control failure temperature rise

1

Not warming up

2

After the temperature reaches the set value, it still surges sharply.

3

Temperature fluctuation is too large

4

Poor temperature uniformity

5

III, IV type box is charged

Serial number

Fault phenomenon

the reason

Method of exclusion

1

Vacuum can't pump

1 seal aging failure

Replace the seal. Seal the strip as far as possible from the organic solvent and its atmosphere.

2 vacuum pump failure

Replace the vacuum pump

3 doors are not closed

Re-tighten and gently push the glass when vacuuming begins.

4 vacuum gauge vacuum shows illusion.

Replace the vacuum gauge

2

Large temperature fluctuations

1 large external power supply voltage change

Take voltage regulation measures to meet the power supply requirements of the equipment.

2 temperature control instrument drift

Replace the temperature control instrument.

3

Not warming up

1 heater circuit breaker

If the wiring is broken, the fault may still be replaced.

2 sensor open circuit

After the wiring is disconnected, the fault may still be replaced after the sensor is replaced.

3 relay open circuit

If the wiring is broken, the fault will still be replaced and the contactor will be replaced.

4 temperature control meter is not set

Reset the temperature control instrument according to the requirements of the manual.

4

Temperature control failure

Temperature rise

1 sensor short circuit

If the wiring is shorted, the fault may still be replaced after the sensor is replaced.

2 relay short circuit

Replacement relay

3 temperature control instrument failure

Replace the temperature control instrument.