High and low temperature alternating heat and humidity test chamber
The high and low temperature alternating heat and humidity test chamber is an instrument for changing temperature and humidity. It has certain requirements and settings for temperature and customs. Next, we will learn about the high and low temperature alternating heat and humidity test chamber.
Wind speed of high and low temperature alternating heat and humidity test chamber
The standard for high and low temperature alternating heat and humidity test chambers stipulates that the wind speed in the temperature and humidity chamber should be less than 1.7m/s when conducting environmental tests. For the test itself, the wind speed is as small as possible, and the wind speed is too high to accelerate the surface of the test piece and the box. The heat exchange of the flowing gas stream is unfavorable in the authenticity of the test. However, in order to ensure the uniformity of the test chamber working chamber, it is necessary to have circulating air in the high and low temperature alternating heat and humidity test chamber. However, the rapid temperature change high and low temperature test chamber and the multi-factor comprehensive environmental test chamber such as temperature, humidity and vibration, in order to pursue the temperature change rate, the flow velocity of the circulating airflow in the tank must be accelerated, and the wind speed is usually 2 to 3 m/s. Therefore, the wind speed limit is different for different purposes.
Temperature uniformity of high and low temperature alternating heat and humidity test chamber
In order to more accurately simulate the actual environmental conditions that the product suffers in nature, in the environmental test of the high and low temperature alternating heat and humidity test chamber, it is necessary to ensure that the periphery of the tested product is under the same temperature and environment conditions, for which it must be in the test chamber. Temperature gradients and temperature fluctuations are limited. In the national military standard GJB150.1-86 military equipment environmental test method general provisions clearly stipulate "the temperature of the measurement system near the test sample should be within ± 2 ° C of the test temperature, the temperature of the work does not exceed 1 ° C / m or the total maximum It is 2.2 ° C (test sample does not work)".
Temperature fluctuation of high and low temperature alternating heat and humidity test chamber
The high temperature and low temperature alternating heat and humidity test chamber temperature fluctuation is a relatively easy to achieve parameter, and the actual temperature fluctuation of most test chambers produced by all environmental test equipment manufacturers can be controlled within ±0.3 °C.
The above is the introduction of the temperature and speed of the high and low temperature alternating heat and humidity test chamber. When using the high and low temperature alternating heat and humidity test chamber, we must strictly follow the product specifications of the Hongzhan high and low temperature damp heat test chamber.
<Use>
P series high and low temperature alternating heat and humidity test chamber is widely used in electrician, electronics, aerospace, aviation, instrumentation and other industries, materials, parts and equipment, etc. Accelerated damp heat test, alternating temperature test, so that the test sample is given Evaluation of behavioral performance under environmental conditions.
< Features >
â—Human-machine dialogue touch screen input system, easy to learn and powerful, and can understand the curve and monitoring process of the program on the LCD screen;
â—The program can be set to 120 groups, 1200 segments, and the number of cycles can reach 999 times. The maximum setting for each period is 99 hours and 59 minutes.
â— With RS232 communication interface, it can be controlled and monitored by PC. It can also be equipped with RS485 interface, USB curve recording and data storage device, which is convenient to use;
â— With 9 sets of PID parameter adjustment to achieve stable and precise control;
â— With program correction, clear, reservation, start, power outage, memory, key lock and other functions;
â— With a variety of alarm functions, when a fault occurs, it can be displayed through the screen fault to eliminate the fault;
â—Unique air circulation design, uniform temperature and humidity distribution;
â— Vacuum double glass with automatic anti-frost device, which can clearly observe the test sample in the test box;
â— Front-mounted automatic water inlet device for easy addition of humidifying water.
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