Selection of the installation site of the rapid temperature change test chamber:
The distance from the adjacent wall can smoothly give full play to the role and characteristics of the environmental test chamber. The long-term temperature of 15 ~ 45 °C and the relative environmental humidity exceeding 86% should be selected. site.
The working temperature of the installation site must not change significantly.
It should be installed on a leveling surface (use a level to determine the level on the road during installation).
It should be installed in a site without sun exposure.
It should be installed in a site with excellent natural ventilation.
It should be installed in areas where flammable materials, explosive products and high-temperature heat sources are eliminated.
It should be installed in a site with less dust.
Install it as close as possible to the switching power supply of the power supply system.
High and low temperature test chamber may encounter a variety of problems in the process of use, the following is a summary of potential faults and their causes from different perspectives:
1. Core system failure
Temperature out of control
Reason: PID control parameters are out of balance, ambient temperature exceeds the design range of the equipment, multi-zone temperature interference.
Case: In a special environment workshop, the external high temperature causes the refrigeration system to overload, resulting in temperature drift.
Humidity is abnormal
Reason: poor water quality of humidification leads to scaling and nozzle blockage, failure of ultrasonic humidifier piezoelectric sheet, and incomplete regeneration of dehumidification desiccant.
Special phenomenon: reverse condensation occurs during high humidity test, resulting in the actual humidity in the box being lower than the set value.
2. Mechanical and structural problems
Air flow is disorganized
Performance: There is a temperature gradient of more than 3℃ in the sample area.
Root cause: the customized sample rack changed the original design air duct and the accumulation of dirt on the centrifugal fan blade led to the destruction of dynamic balance.
sealing failure
New failure: the magnetic force of electromagnetic sealing door decreases at low temperature, and the silicone sealing strip becomes brittle and cracks after-70℃.
3. Electrical and control system
Intelligent control failure
Software level: After firmware upgrade, the temperature dead zone setting error occurs and the historical data overflow causes the program to crash.
Hardware level: SSR solid state relay breakdown causes continuous heating and bus communication is subjected to inverter electromagnetic interference.
Security protection vulnerabilities
Hidden dangers: the synchronous failure of the triple temperature protection relay and the false alarm caused by the expiration of the refrigerant detector calibration.
4. Challenges of special working conditions
Specific temperature shock
Problem: -40℃ to +150℃ rapid conversion of the evaporator weld stress cracking, thermal expansion coefficient difference resulting in the failure of the observation window seal.
Long-term operation attenuation
Performance degradation: after 2000 hours of continuous operation, the compressor valve plate wear leads to a decrease of 15% in refrigeration capacity and drift of ceramic heating tube resistance value.
5. Environmental and maintenance impact
Infrastructure adaptation
Case: The power oscillation of PTC heater caused by the fluctuation of power supply voltage and the water hammer effect of cooling water system damaged the plate heat exchanger.
Preventive maintenance blind spots
Lesson: Ignoring the positive pressure of the box leads to water entering the bearing chamber and biofilm growth and blockage in the condensate discharge pipe.
6. Pain points of emerging technologies
New refrigerant application
Challenges: system oil compatibility problems after R448A replaces R404A, and high pressure sealing problems of subcritical CO₂ refrigeration systems.
IoT integration risks
Fault: The remote control protocol is maliciously attacked, resulting in program tampering and cloud storage failure, resulting in the loss of test evidence chain.
Strategy recommendations
Intelligent diagnosis: configure vibration analyzer to predict the failure of compressor bearing, and use infrared thermal imager to scan the electrical connection points regularly.
Reliability design: key components such as evaporator are made of SUS316L stainless steel to improve corrosion resistance, and redundant temperature control modules are added to the control system.
Maintenance innovation: implement a dynamic maintenance plan based on operating hours, and establish an annual refrigerant purity testing system。
The solutions to these problems need to be analyzed in combination with the specific model of the equipment, the use environment and the maintenance history. It is recommended to establish a collaborative maintenance mechanism including the OEM of the equipment, third-party testing institutions and user technical teams. For key test items, it is recommended to configure a dual-machine hot standby system to ensure the continuity of testing.
(1) Equipment installation and commissioning
On-site service: technical personnel will deliver the goods free of charge and complete the mechanical assembly, electrical wiring and debugging. The debugging parameters shall meet the temperature and humidity, salt spray deposition amount and other indicators in the customer's technical agreement.
Acceptance criteria: provide a third-party measurement report, and unqualified equipment shall be returned or replaced directly. For example, the rain test box shall pass 100% acceptance.
(2) Customer training system
Operation training: covers equipment start and stop, program setting and daily maintenance, customized for different user scenarios such as quality inspection institutions and automobile enterprises.
Deep maintenance training: including fault diagnosis (such as troubleshooting of humidity system in high and low temperature and humidity test chamber) and spare parts replacement to improve customers' independent maintenance ability.
(3) Technical support and response
Instant response: respond to repair demand within 15 minutes, and solve routine faults within 48 hours (negotiate with remote areas).
Remote diagnosis: through video guidance or remote access software, quickly locate the problem (such as abnormal dust concentration in the sand test chamber).
(4) Spare parts supply and maintenance
Make spare parts plan, give priority to the supply of wear and tear parts from cooperative units (such as China Railway Inspection and Certification Center, China Electronics Technology Group), and reduce downtime.
Non-manual damage is free of charge during the warranty period, and paid services are provided after the warranty period with transparent charges.
1. Dust adhering to the condenser can cause the high-pressure switch of the compressor to trip and issue false alarms. Therefore, dust attached to the cooling grid of the condenser can be removed with a vacuum cleaner every month, or by using a hard-bristled brush after turning on the machine, or by blowing it off with a high-pressure air nozzle.2. The area around the machine and the ground at the bottom should be kept clean at all times to prevent a large amount of dust from being sucked into the unit or reducing equipment performance and causing accidents.3. When opening or closing the door or taking samples from the test chamber, do not touch the sealing strip on the door.4. The core of the constant temperature and humidity test chamber - the refrigeration system should be inspected once a year. Check for leaks in the copper tubes and at each joint and interface. If there are any, inform the manufacturer.5. The humidifier and water tank should be cleaned frequently to avoid scaling and affecting steam emission. Clean them after each test. Timely descaling helps extend the lifespan of the humidification tube and ensures smooth water flow. When cleaning, use a copper brush and then rinse with water.6. The distribution room should be cleaned and inspected more than once a year. Loose nodes can put the entire equipment in a dangerous working state, burn out components, cause fires, alarms, and endanger lives.7. The dry and wet bulb wicks should be checked frequently. Replace them promptly if they become hard or dirty. It is recommended to replace them every three months.8. Inspection and maintenance of the water circuit. The water pipes in the water circuit are prone to clogging and leakage. Regularly check for leaks or blockages. If found, remove them promptly or notify the manufacturer.
1. Kondensor (atau radiator) unit pendingin di ruang uji kejut dingin dan panas harus dirawat secara teratur untuk memastikannya tetap bersih. Debu yang menempel pada kondensor dapat menyebabkan sakelar tekanan tinggi kompresor aktif, yang menyebabkan alarm palsu. Kondensor harus dibersihkan setiap bulan menggunakan penyedot debu untuk menghilangkan debu dari jaring pendingin kondensor, atau setelah menyalakan mesin, gunakan sikat berbulu keras untuk membersihkannya, atau tiup debu dengan nosel udara bertekanan tinggi.2. Saat membuka atau menutup pintu atau mengambil benda uji dari tungku, jangan biarkan benda tersebut menyentuh tepi karet pada pintu untuk mencegah tepi karet rusak dan memperpendek umur.3. Jaga tanah di sekitar dan di bawah badan pesawat tetap bersih setiap saat untuk menghindari kecelakaan dan penurunan kinerja yang disebabkan oleh banyaknya debu yang terhisap ke dalam unit.4. Sistem pembekuan ruang uji kejut dingin dan panas merupakan inti dari mesin ini. Harap periksa semua tabung tembaga untuk mengetahui adanya kebocoran dan kondisi salju setiap setengah tahun, serta semua nosel dan sambungan las. Jika terjadi kebocoran oli, harap beri tahu perusahaan atau tangani langsung.5. Kontak arus besar pada panel distribusi harus dibersihkan dan diperbaiki setidaknya setahun sekali di ruang distribusi. Kendurnya kontak akan membuat seluruh peralatan bekerja dalam kondisi yang berisiko. Paling banter, komponen akan terbakar, dan paling parah, dapat menyebabkan kebakaran, alarm, dan cedera diri. Saat membersihkan, gunakan penyedot debu untuk menghilangkan debu di ruangan.6. Jangan menyetel nilai pengaturan dua pelindung suhu berlebih di kotak distribusi daya ruang uji kejut dingin dan panas dengan sembarangan. Nilai ini telah disetel di pabrik. Sakelar pelindung ini digunakan untuk melindungi tabung pemanas dari pembakaran kosong dan alarm. Titik pengaturan = titik pengaturan suhu 20℃~30℃.7. Ruang Uji Kejutan Dingin dan Panas Saat mengambil produk uji pada saat tiba waktunya, produk harus dalam keadaan mati dan petugas harus memakai sarung tangan kering, anti listrik, dan tahan suhu saat mengambil dan menaruh produk.8. Bersihkan dan rawat bagian dalam dan luar ruang uji kejut dingin dan panas. 9. Sebelum mengoperasikan ruang uji kejut dingin dan panas, singkirkan semua kotoran internal. 10. Ruang distribusi listrik harus dibersihkan setidaknya setahun sekali. Saat membersihkan, gunakan penyedot debu untuk menghilangkan debu. Bagian luar ruang harus dibersihkan setidaknya setahun sekali, menggunakan air sabun untuk mengelapnya.
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