Temperature and Humidity Test Chambers

• Common Problems and Solutions for Dual 85 Testing of Temperature and Humidity Test Chambers

  Dec 09, 2025

      This guide summarizes key issues and solutions for temperature & humidity test chambers during dual 85 testing (85℃, 85% RH), focusing on quick troubleshooting and long-term maintenance for operators and customers. I. Core Issues & Resolution System Each issue includes root cause, immediate solution, and long-term prevention (except for defect exposure). 1. Failure to Reach 85% RH Root Cause: Compressor over-dehumidifies—evaporator temperature below dew point (79-80℃) causes condensation, outpacing humidification. Immediate Solution: Disable compressor; run only heating and humidification to maintain 85℃ and avoid condensation. Prevention: Regularly calibrate humidifier atomization volume and check evaporator temperature sensor accuracy. 2. Temperature Out-of-Control/Fluctuations Root Cause: Mainly faulty solid-state relays (keeps heating elements on), plus aging heating tubes or defective temperature sensors. Immediate Solution: Cut power; inspect circuit with multimeter (relay on-off, heating tube damage, sensor accuracy) and replace faulty parts. Prevention: 10-15min pre-calibration before testing; replace vulnerable parts (relays, sensors) every 1000 operating hours. 3. Water Marks/Condensation on Products Root Cause: Residual oil/dust on products, or dense samples blocking air ducts (poor circulation, localized high humidity). Immediate Solution: Pause test; clean products with anhydrous ethanol, dry, and reposition samples for proper spacing. Prevention: Establish pre-test cleaning standards; clean air duct filters regularly and optimize sample rack layout. 4. Incorrect Operation Logic Root Cause: Operator errors—misactivated refrigeration, wrong parameters (fast heating, delayed humidification), or mismatched operation modes. Immediate Solution: Reset program (disable refrigeration, set 85℃/85% RH, sync humidification with heating). Prevention: Develop SOPs; new employees must pass operation assessments (including simulated faults). 5. Material/Process Defect Exposure Root Cause: Extreme environment accelerates aging—e.g., poor heat-resistant EVA film hydrolyzes (yellowing, delamination); leaky electronic packages cause corrosion/short circuits. Measures: Inspect products post-test, record defects; judge qualification by material standards; optimize processes (e.g., use hydrolysis-resistant EVA, enhance sealant density).

  heiße Tags : Temperature and Humidity Test Chambers Testkammer für hohe und niedrige Luftfeuchtigkeit Temperaturumgebungsprüfkammer Hersteller von Umweltprüfkammern Umweltsimulationskammer Environmental Chamber

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