Serial number

Fault phenomenon

Cause Analysis

elimination method

1

Does not heat up

The set operating temperature of the instrument has not been adjusted.

When the set operating temperature of the instrument is lower than the ambient temperature value, the device will not work. Please adjust the instrument to set the operating temperature.

The heating switch is not turned on.

Please select and turn on the heating switch according to the required working temperature.

The contact of the heating wire is bad or the heating wire is broken.

When the heating wire is in poor contact, please tighten the heating wire contact nut. If the heating wire is broken, the heating wire needs to be replaced.

Poor contact of relay (or contactor) contacts

Clean the contacts of the relay (or contactor).

Sensor open

Switch on the sensor circuit.

Instrument damage

Replace the meter.

2

After the temperature reaches the set value, it still overshoots greatly

Sensor short circuit

Eliminate the sensor short circuit fault or replace the sensor.

Instrument damage

Replace the meter.

Improper adjustment of temperature protection switch. Adjust the alarm temperature value of the temperature protection switch strictly according to the instructions.

The contact of the relay (or contactor) has been eroded

Replace the relay (or contactor)

3

Excessive temperature fluctuations

Ambient temperature changes too much

Improve environmental conditions and avoid excessive changes in ambient temperature.

Power supply voltage changes too much

Take voltage stabilization measures

Instrument control is sluggish

Repair or replace the meter.

4

Poor temperature uniformity

Blower motor does not rotate

Eliminate the blower motor electrical circuit failure

The sample is too dense

The test product should be loaded according to the instructions to ensure the normal circulation of hot air in the working room.

Hot air leak

Adjust the height of the door seal in the door slot to a suitable position.

Improper adjustment of air outlet

Adjust according to the working temperature and the density of the sample.

5

Type â…¢ and â…£ cabinets are charged

The phase of the external three-phase four-wire power line does not match the equipment

Connect the external power supply according to the phase marked on the device.

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