As a core device for simulating complex temperature and humidity environments, the walk-in constant temperature and humidity test chamber is widely used in fields such as automobiles, electronics, and new energy. Its stable operation relies on standardized operating procedures and a scientific maintenance system. This article systematically outlines the key points of equipment usage from three dimensions: safe operation, daily maintenance, and in-depth inspection.

1、 Safety operation norms: core principles for risk avoidance

1. Environmental adaptability control

The equipment needs to be placed at a certain temperature10-30℃Humidity≤85%RHAvoid direct sunlight or proximity to heat sources in the environment. A certain electronic company caused deformation of the casing, moisture and short circuit of electrical components due to placing the equipment next to the heater, resulting in excessive maintenance costs20Ten thousand yuan. Reserve space around the equipment≥50cmThe heat dissipation space, especially the compressor side, needs to be unobstructed to prevent overheating and shutdown.

2. Power and grounding management

must use380VThree phase five wire power supply and ensure grounding resistance≤4ΩA laboratory failed to properly ground, resulting in controller failure caused by electrostatic induction and data loss. Before operation, it is necessary to check the leakage protector and conduct a simulated leakage test once a month: press the test button. If the circuit breaker does not trip, it needs to be replaced immediately.

3. Power on/off and access control

Compressor protection:5It is forbidden to repeatedly start and stop the refrigeration unit within minutes. Frequent switching can cause carbonization of the compressor lubricating oil, resulting in a shortened equipment life for a certain battery manufacturer60%.

Low temperature door opening restriction: in-20℃During the following operation, the door opening time should be controlled within30Within seconds, prevent the evaporator from frosting. During the testing of a battery pack by a certain car company, the refrigeration system was blocked due to prolonged opening of the door, resulting in time-consuming repairs72Hour.

High temperature protection:85℃During the above operation, wear heat-resistant gloves when opening the door to avoid steam burns.

2、 Daily maintenance: a key link in preventive maintenance

1. Cleaning and anti-corrosion of the cavity

Before testing: Wipe the chamber with a dust-free cloth to remove any residual oil and metal debris from the sample and prevent sensor contamination. A semiconductor company's failure to clean chip debris resulted in inaccurate humidity detection15%.

After testing: If salt spray testing is involved, the chamber should be cleaned with neutral detergent, rinsed with clean water, and ventilated to dry. Stainless steel liner is prohibited from using steel wire balls to prevent corrosion caused by coating damage.

2. Water system management

Humidified water tank: Clean once a week and soak in citric acid solution30Remove scale in minutes. A certain pharmaceutical company's failure to clean up in a timely manner resulted in blockage of the humidification pump and excessive humidity fluctuations±5%RH.

Water level control: Confirm the water level before starting up“highest”and“minimum”Between the scales, running without water will burn out the humidification pump, and if the water level is too high, it may overflow and contaminate the chamber.

3. Sealing and air duct inspection

Door seal: Check the silicone seal for deformation and cracking every month, and maintain it with silicone lubricant. Due to aging door seals, a certain airline company experienced air conditioning leakage during low-temperature testing, resulting in increased energy consumption40%.

Fan and air duct: Use compressed air to blow the blades of the circulating fan every month to prevent dust accumulation from affecting the wind speed. Due to air duct blockage, a certain communication company's temperature uniformity in the cavity exceeded the standard±2℃.

3、 Deep maintenance: the core measure to ensure long-term stability

1. Monthly Core Component Calibration

Temperature and humidity sensor: Compare data with a standard measuring instrument, and if the deviation exceeds±0.5℃/±2%RHContact professional personnel for calibration. Due to inaccurate sensors, a new energy enterprise's battery testing data is invalid, resulting in project delays3A month.

Electrical safety testing: After power failure, check whether the wiring terminals are loose, and use a megohmmeter to test the insulation resistance (should be>5MΩ）. A car parts manufacturer caused a short circuit fire due to aging wires.

2. Quarterly system upgrade

Controller firmware: Contact the manufacturer to update the control program and optimize itPIDParameters. A certain electronics company has upgraded and increased its heating rate20%The temperature fluctuation has been reduced to±0.3℃.

Refrigerant supplement: Check the condenser pressure, and supplement if it is lower than the standard valueR404Acryogen. A refrigeration equipment factory suffered from compressor overload and burnout due to refrigerant leakage.

3. Annual comprehensive maintenance

Insulation layer inspection: Use an infrared thermal imager to check if the polyurethane foam layer is damaged. A certain chemical enterprise experienced an increase in energy consumption due to the cracking of the insulation layer35%.

Compressor maintenance: Replace the refrigeration oil and check the sealing of the valve disc. According to statistics from a certain environmental testing chamber manufacturer, the lifespan of a compressor with standardized maintenance can reach10Equipment that is over years old but lacks maintenance on average5It needs to be replaced every year.

Conclusion: Through implementation“Daily cleaning-Monthly calibration-Quarterly upgrade-annual maintenance”The four level maintenance system can reduce the equipment failure rate60%Above, the testing accuracy is stable at±0.5℃/±2%RHWithin. For industries with high reliability requirements such as automobiles and electronics, strictly following this guideline is not only a requirement for equipment management, but also a key measure to ensure product quality and shorten research and development cycles.