Eight characteristics of a rapid temperature change test chamber

The rapid temperature change test chamber is suitable for testing various performance indicators of products in aerospace, information electronics, instruments and meters, materials, electrical engineering, electronic products, and various electronic components under rapid temperature changes.

The rapid temperature change test chamber is mainly designed for the adaptability testing of electrical and electronic products, as well as other raw materials for storage, transportation, and use in high-temperature and low-temperature rapidly changing environments.

Eight characteristics of a rapid temperature change test chamber:

1. The structure adopts a jacket free and modular design concept, with a simple appearance and ideal assembly method. The compact chamber structure is extremely convenient for maintenance and use.
2. The outer shell is made of cold-rolled thin steel plate, with a surface sprayed with plastic, which is beautiful and durable. The inner chamber adopts stainless steel plates to make its inner surface flat and clean; At the same time, the right side of the studio is equipped with circulation devices, heaters, refrigeration evaporators, and other components, and the top is equipped with a pair of blower motors to circulate cold and hot air into and out of the studio to ensure the temperature requirements of the studio.
3. The sealing strip of the inner and outer doors is made of silicone rubber material, which is safe and non-toxic.
4. Equipped with two sealing devices, due to good sealing performance, and equipped with a large-sized observation window for easy observation of the test situation of the sample item, it also has the characteristic of good sealing performance.
5. The rapid temperature change test chamber adopts a touch digital display instrument, which has functions such as programming, curve display, PID self-tuning, and fault display.
6. The refrigeration system is installed on the right side of the main chamber, and the refrigeration unit adopts imported units with good performance, convenient installation, and reliable performance.
7. Super strong safety protection functions: power overload protection, leakage protection, control circuit overload, short circuit protection, compressor protection, grounding protection, over temperature protection, alarm sound prompt, etc.
8. Customized model technical parameters can be designed according to specific test requirements based on the user’s sample size and the size of the sample.

Advantages of the control system of the rapid temperature change test chamber:

1. Multiple stress screening (fast temperature change rate) test conditions of 5 ℃ to 25 ℃/min can be set.
2. Meet the testing requirements of electronic equipment product stress screening, lead-free process, MIL-STD-2164, MIL-344A-4-16, MIL-2164A-19, NABMAT-9492, GJB-1032-90, GJB/Z34-5.1.6, IPC-9701, etc.
3. Can execute equal and average temperature test methods.
4. The temperature stress screening test chamber ESS uses aluminum sheets to verify the machine’s load capacity (non plastic loads).

Reason for temperature failure in the rapid temperature change test chamber:

The heating and cooling rate of the rapid temperature change test chamber can reach 3 ℃/min~15 ℃/min, and even above 30 ℃/min; The temperature range of the rapid temperature change test chamber with specifications and speed is generally the same, such as -60 ℃~130 ℃/min, but the temperature range of the cooling rate is not the same. According to different requirements of the test, some of the temperature range of the test chamber is -55 ℃~80 ℃/min, and others are -40 ℃~80 ℃/min.

In fact, when the low temperature cannot meet the experimental indicators, we need to observe the temperature change, whether it is because the temperature drops slowly or because there is a trend of recovery after reaching a certain value. For the former, it is necessary to check whether the studio is dried before conducting the low-temperature test, keep the studio dry, and then place the test samples in the studio before conducting the test. Additionally, it is necessary to check whether there are too many test samples in the studio, which prevents the wind from fully circulating.

After eliminating the above reasons, it is necessary to consider whether the refrigeration system has malfunctioned. If so, contact the supplier and ask professional personnel for maintenance. The latter phenomenon is caused by the poor use environment of the test chamber, as the environmental temperature and location of the test chamber must meet the requirements.

Humidity issues in the rapid temperature change test chamber:

When conducting a damp heat test, the actual humidity may reach 100% or the actual humidity may differ significantly from the target humidity, with much lower values. The former phenomenon may be caused by the drying of the gauze on the wet bulb sensor, which requires checking whether there is a shortage of water in the water tank of the wet bulb sensor. Since the water level in the water tank is automatically controlled by the water level controller, it is necessary to check whether the water supply system and operation are normal.

It is also possible that wet bulb gauze may become hard due to prolonged use or the purity of the water supply, making it unable to absorb water and dry. In this case, simply replace or clean the gauze to remove it. The latter phenomenon is that the humidification system is not working, and it is necessary to check whether there is a certain amount of water in the water supply system of the humidification system, whether the water level control of the humidification boiler is normal, and whether the water level in the humidification boiler is normal.

Maintenance of rapid temperature change test chamber:

1. Operations and maintenance required by personnel who have switched jobs;
2. Users should suggest the use records of the test chamber for equipment maintenance; Use archives to record the start and end times of each cloud center test in the test chamber, the type of test, and the environmental temperature. When the test chamber malfunctions, it is necessary to provide a detailed description of the phenomenon of rapid temperature change test chamber malfunctions, and the maintenance and repair content of the test chamber should also be recorded as detailed as possible;
3. The interior and surrounding environment of the test chamber should be kept clean;
4. Long term shutdown of the test chamber will affect the effective service life of the equipment, but it needs to be started and run every 10 days;
5. Do not repeatedly run and stop the equipment in a short period of time. The number of starts per hour should be less than 5, and the time interval between each start and stop should not be less than 3 minutes;
6. Use a vacuum cleaner to remove dust from the distribution room and water circuit room, which should be done once a year;
7. Rapid temperature change test chamber action test: Set the temperature of the overtemperature protector to be lower than the temperature of the Rapid temperature change test chamber. If an alarm and beep sound appear, it indicates that its function is normal.

The rapid temperature change & humidity heat test chamber is a temperature and humidity test device, applied for aerospace products, information electronic instruments, electrical, electronic products, and various electronic components to test various products under the condition of rapid temperature change performance.

KWB-054D Rapid temperature change & humidity heat test chamber