1、 Daily cleaning and anti fouling

1. External surface cleaning
   • frequencyWipe the outer shell of the test chamber with a dry cloth every week to remove dust, oil stains, and other impurities. If there are stubborn stains on the surface (such as glue residue), neutral cleaning agents (such as diluted dishwashing detergent) can be used to gently wipe, and then dry with a dry cloth.
   • tabooDo not use strong acids, strong alkalis, or corrosive cleaning agents (such as hydrochloric acid, sodium hydroxide) to prevent corrosion or fading of the casing.
2. Inner liner cleaning
   • frequencyClean the inner container after each test to avoid residue (such as water stains, salt spray, chemical reagents) corroding the inner wall or affecting the results of the next test.
   • methodWipe the inner wall with a dry cloth. If the residue is difficult to remove (such as salt crystals after salt spray test), rinse with deionized water and wipe dry. Do not use hard objects (such as steel wire balls) to scratch the inner wall to prevent scratching.
3. Cleaning of drainage system
   • frequencyCheck the drainage pipes for blockages every month and clean up impurities (such as hair and fibers) near the drainage outlet. If the drainage is not smooth, a fine wire can be used to clear the pipeline, or the manufacturer can be contacted to replace the drainage valve.
   • ExampleAfter the salt spray test, it is necessary to clean the drainage outlet in a timely manner to prevent salt crystallization from blocking the pipeline.

2、 Core component maintenance

1. Humidification system maintenance
   • Water tank cleaningClean the water tank monthly to remove scale and impurities such as microorganisms and dust. If the water quality is poor (such as hard water), the cleaning frequency should be increased to once every 2 weeks. When cleaning, first empty the water tank, wipe the inner wall with a soft cloth, and then rinse with deionized water.
   • Humidifier tube inspectionCheck the humidification pipe quarterly for aging, cracking, or blockage. If damage is found, it should be replaced in a timely manner to prevent the humidification function from malfunctioning.
   • Water quality controlUse deionized water or distilled water as the humidification source, avoid using tap water (which contains minerals and is prone to scale formation), and extend the lifespan of the humidification system.
2. Maintenance of refrigeration system
   • Condenser cleaningClean the dust on the condenser fins with compressed air or a soft bristled brush every quarter to prevent poor heat dissipation from causing a decrease in cooling efficiency. If the heat sink is deformed, it needs to be repaired with professional tools or replaced by contacting the manufacturer.
   • Refrigerant inspectionCheck the refrigerant pressure annually (professional equipment is required). If the pressure is insufficient or leaks, replenish the refrigerant and repair the leak point.
   • compressor protectionAvoid frequent starting and stopping of the compressor (such as multiple on-off switches in a short period of time) to prevent overheating and damage to the compressor. If the test chamber is not used for a long time, it needs to be powered on and run for 1-2 hours every month to maintain compressor lubrication.
3. Heating system maintenance
   • Heating tube inspectionCheck the heating tube every six months for aging, breakage, or poor contact. If there is carbon or oxide layer on the surface of the heating tube, it needs to be gently sanded clean with sandpaper to restore heating efficiency.
   • Overheating protection testTest the sensitivity and reliability of overheat protection devices (such as temperature relays) annually. If the protective device fails, it needs to be replaced immediately to prevent dry burning and damage to the heating tube.

3、 Environmental Control and Protection

1. Calibration of temperature and humidity sensors
   • calibration cycleCalibrate the temperature and humidity sensor every 6-12 months to ensure accurate measurement results. Calibration requires the use of standard equipment (such as high-precision temperature and humidity meters) or contacting the manufacturer.
   • calibration methodPlace the standard equipment and the test chamber sensor in the same environment, compare the measurement results, and adjust the parameters of the test chamber sensor to within the allowable range of error (such as temperature ± 0.5 ℃, humidity ± 2% RH).
2. Environmental adaptability adjustment
   • placement locationThe test chamber should be placed in a well ventilated environment away from heat sources (such as heating, direct sunlight) and vibration sources (such as punching machines, elevators) to prevent external factors from interfering with the test results.
   • Horizontal adjustmentUse a spirit level to check if the test chamber is placed horizontally. If it is uneven, adjust the base screws to prevent abnormal equipment operation or water leakage.
3. Anti corrosion measures
   • If the test chamber is used for salt spray testing or corrosive gas environment, it is necessary to regularly check the sealing of the box (such as whether the door seal is aging or leaking) and replace the seal in a timely manner. After the experiment, the inner container needs to be cleaned to prevent residual corrosive substances.

4、 Operating standards and records

1. Operating Specifications
   • Pre-test inspectionBefore each experiment, check whether all components of the test box (such as humidification pipes, drainage valves, power lines) are normal to ensure that there are no safety hazards such as water leakage or electric leakage.
   • Parameter SettingsAccording to the test standards (such as GB/T 2423), set the temperature and humidity parameters to avoid using beyond the range (such as temperature exceeding the rated value and humidity below the lower limit) and prevent equipment damage.
   • Monitoring during the experimentDuring the experiment, regularly observe the operating status of the equipment (such as temperature fluctuations and humidification speed). If any abnormalities are found (such as continuous temperature rise or humidification failure), the machine should be stopped immediately for inspection.
2. Maintenance Record
   • Establish and maintain a record of the date, content, and results of each cleaning, calibration, and repair. For example, on December 26, 2025, clean the condenser, replace the humidification tube, calibrate the temperature and humidity sensor, with an error temperature of ± 0.3 ℃ and humidity of ± 1.5% RH.
   • Maintaining records helps track equipment status, identify potential issues in advance, and extend service life.