Function characteristics of Rapid temperature change test chamber

The Rapid temperature change test chamber, which is used to test the performance indicators of products under the condition of rapid temperature change in aerospace, information electronics, instruments and meters, materials, electrical and electronic products, and various electronic components.

The Rapid temperature change test chamber uses a “binary cascade air-cooled refrigeration system” composed of a set of fully closed compressors. The cascade refrigeration system includes “a high temperature refrigeration cycle and a connecting container for a refrigeration cycle” as the evaporative condenser. It is suggested that the evaporative condenser also has the function of energy transfer, which transfers the internal heat energy of the studio through the two-stage refrigeration system to achieve the purpose of temperature rise.

The high and low refrigeration cycle of the Rapid temperature change test chamber usually adopts the “inverse Carrot cycle”, which is composed of “two isothermal processes and two adiabatic processes”. The process is as follows: after the refrigerant is adiabatic compressed to a higher pressure by the compressor, the work is consumed and the exhaust temperature is increased, the refrigerant is made by isothermal heat exchange through the condenser and the surrounding media, and the heat is transferred to the surrounding media, and the refrigerant is adiabatic expanded through the valve to do work, at this time the temperature of the refrigerant will be reduced. The refrigerant in the rear can absorb heat through the evaporator and other objects with higher temperature to reduce the temperature of the cooled object. This cycle is repeated to achieve the purpose of cooling.

The Rapid temperature change test chamber has the following characteristics:
1. The structure adopts the design idea of combination without jacket;
It has simple appearance, ideal assembly method, compact chamber structure, and is extremely convenient for maintenance and use;

2. The shell is made of cold-rolled steel sheet with plastic-sprayed surface, beautiful and durable; The inner liner is made of stainless steel plate and its surface is flat and clean; The right side of the working room is equipped with circulation device, heater, refrigeration evaporator and other components; The top is equipped with a pair of blower motors to circulate hot and cold air in and out of the working room to ensure the temperature requirements;

3. The sealing strip of internal and external doors is made of silicone rubber, which is safe and non-toxic;

4. The rapid temperature change test chamber is equipped with two sealing devices with good sealing performance, and observation windows are set to observe the test conditions of samples;

5. The fast temperature change test chamber adopts touch digital display instrument, and has the functions of programming, curve display, PID self-tuning and fault display;

6. The refrigeration system is installed on the right side of the main chamber. The refrigeration unit is imported with good performance, which is convenient to install and reliable in performance;

7. Ultra-strong safety protection function: power overload protection, leakage protection, control circuit overload, short circuit protection, compressor protection, grounding protection, over-temperature protection, alarm sound prompt, etc;

8. It can be designed and customized according to the user’s test object, the size of the test object, and the specific test requirements.

Advantages of the control system of the Rapid temperature change test chamber:
1. Various test conditions for stress screening (fast temperature change rate) of 5 ℃~25 ℃/min can be set.
2. Meet the test requirements of electronic equipment product stress screening, lead-free manufacturing 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. The equal and average temperature test can be carried out.
4. Temperature stress screening test chamber ESS uses aluminum sheet to verify the machine load capacity (non-plastic load).

There are two ways to select the temperature rise and fall rate for the rapid temperature change test chamber:
The temperature rise and drop rate of the rapid temperature change test chamber can reach 3 ℃/min~15 ℃/min, or even more than 30 ℃/min; The temperature range of the rapid temperature change test chamber with the specification and speed is generally the same, such as – 60 ℃~130 ℃/min, but the temperature change range of the cooling speed is different. According to the different requirements of the test, the temperature change range of the test box is – 55 ℃~80 ℃/min, and there are – 40 ℃~80 ℃/min.

1. The nonlinear temperature rise and fall rate, that is, the average temperature rise and fall rate in the whole process (the ratio of the difference between the extreme high temperature and the extreme low temperature within the temperature range of the test chamber and the time), indicates that the test chambers produced by the environmental test industry at home and abroad are all nonlinear temperature rise and fall rates.

2. Linear temperature rise and fall speed (actually the average speed in the fifth minute), in fact, it is extremely difficult to ensure the linear temperature rise and fall speed for the rapid temperature change test chamber, and the key section is the temperature drop rate that can be reached by the test chamber in a 5-minute period at the end of the cooling section.

How to deal with the problem that the low temperature of the Rapid temperature change test chamber cannot meet the test index?
In fact, when the low temperature can not reach the test index, we need to observe the temperature change, whether it is because the temperature drops very slowly or because the temperature has a tendency to rise after reaching a certain value. For the former, it is necessary to check whether the working room is dried before the low-temperature test, and put the test samples into the working room after the working room is kept dry for the test, and whether the test samples in the working room are placed too much, so that the wind can not be fully circulated. After the above reasons are eliminated, it is necessary to consider whether there is a fault in the refrigeration system. 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, because the ambient temperature and location of the test chamber should meet the requirements.

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.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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