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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