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. 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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September 17, 2020