I. Accuracy Deviation Assessment
Repair is necessary if the output deviation at all calibration points surpasses twice the device's nominal accuracy when measured with a reference calibrator and cannot be brought back to the permissible range using standard calibration.
Excessive thermal signal output deviation: Pt100 RTD analogue output deviation exceeds ±0.05Ω, thermocouple millivolt analogue output deviation exceeds ±5μV, and cannot be satisfied after calibration; repair is necessary.
Repair is necessary if the frequency output deviation is greater than ±5 ppm and cannot be zeroed after modifying the frequency correction factor.
II. Hardware Function Evaluation
Repair is necessary if the device displays power failures, such as the inability to turn on, indicator lights that don't light up or flash, or frequent power restarts, and the issue still exists after external problems with the power cord and socket have been ruled out.
Repair is necessary if there is no display, jumbled content, or a black or distorted screen that cannot be fixed even after firmware updates and restarts.
Even after cleaning contacts and restoring factory settings, unresponsive buttons, broken adjustment knobs, and a frozen or unresponsive user interface point to the need for repair.
Repair is required if the output port and connected cables are checked, the output signal amplitude is unstable, the waveforms are significantly distorted, and there is no signal output.
Even after optimising grounding and changing connection cables, frequent disruptions in signal transmission when coupled to a hot runner temperature control system suggest that repairs are necessary.
III. Problems with Stability
The drift surpasses 0.1% of the range after an hour of continuous operation, and it keeps rebounding after calibration, signifying the need for repair.
Long-lasting, erratic output fluctuations caused by a slight vibration of the equipment casing indicate improper soldering or contact in internal components that need to be repaired.
The drift abruptly rises to above 200% of the ambient temperature within the typical ambient temperature range of -10°C to 60°C, suggesting aberrant thermal drift that needs to be repaired.
IV. Problems with Compliance
During self-test, the equipment consistently reports hardware error codes that, once software problems have been ruled out, cannot be cleared, suggesting a need for repair.
Even if the equipment's current functioning seem okay, a thorough hardware inspection must be carried out to check for hidden internal damage after it has been dropped, exposed to intense electromagnetic shock, or experienced overvoltage or overload. Repair is considered necessary if aberrant hardware parameters are verified.
The equipment can be used normally if all requirements are satisfied. In order to prevent operating with a fault that could result in inaccurate hot runner temperature control calibration and flaws in the batch injection moulding process, professional repair should be scheduled as soon as one of the criteria is fulfilled.
