Methods for handling damaged accessories in cold and hot shock tests

1、 Core component damage handling plan

Temperature sensor failure

Diagnosis: Use a multimeter to measure the resistance value. If the deviation from the standard value exceeds 5%, it needs to be replaced

Replacement operation: Disassemble and install after power failure, calibrate PID parameters after replacement to ensure temperature control accuracy

The aging of the sealing strip leads to temperature leakage

Temporary handling: Clean the sealing groove and apply silicone grease to temporarily enhance the sealingSolution: Replace the entire sealing strip and prioritize using silicone rubber material with a temperature resistance range of -70 ℃~150 ℃

Compressor malfunction

Refrigerant leakage: When detecting abnormal pressure gauge values, repair the leakage point first and then charge the refrigerant according to the standard

Mechanical failure: When the operating current exceeds the tolerance of ± 15% or there is abnormal vibration, it is necessary to perform maintenance on the bearings/valve plates

2、 Response to auxiliary system failures

Abnormal wind circulation system

Fan shutdown: Remove dust from fan blades and test motor winding resistance

Air duct blockage: Remove the air guide plate to clean foreign objects, optimize sample placement to avoid obstructing airflow

Humidification system malfunction

Humidity out of control: Check if the wet bulb gauze has hardened (replace monthly)

Detecting the sensitivity of the humidification boiler water level controller

Control system alarm

PID parameter misalignment: Reset the proportional band/integral time parameters according to the equipment manual

Overtemperature protection triggered incorrectly: verify the on/off status of the solid-state relay

Monthly maintenance

Clean the dust on the condenser fins (blown with compressed air)

Tighten the electrical terminals to prevent poor contact.

Annual deep maintenance

Replace all seals and sensors (whether damaged or not)

Vacuumize the refrigeration system and refill it with refrigerant