The setting of cooling rate in high and low temperature test chamber
The setting of the cooling rate of high and low temperature test chambers With the rapid development of science and technology and the continuous improvement of automation, new changes will occur in the high and low temperature test chamber industry in China and new developments will be achieved. Its production is not only the actual demand of the vast number of users and the result of technological competition among manufacturers, but also the product and product upgrading of computer technology, communication technology and control technology in the field of industrial control, as well as the realization of further high precision and high performance. (In particular, multi-parameter on-line real-time measurement and control and automatic measurement and control), high stability, high reliability, high adaptability, multi-function, low consumption, etc. provide tremendous power and development space.
The general high-low temperature test box has no cooling rate index. The nominal time from ambient temperature to the lowest temperature is generally 90 ~ 120 minutes. The high and low temperature alternating test chamber and the high and low temperature alternating humidity test chamber have the requirements of temperature change rate. The general requirement of the temperature change rate is 1°C/min, and the speed is adjustable within this speed range. However, the rapid temperature change test chamber has a high temperature change rate, and the heating and cooling rate can reach 3° C./min° C. to 15° C./min. In a certain temperature range, the cooling rate can even reach 30° C. per minute or more.
All kinds of specifications, speed, rapid temperature changes, high and low temperature test chamber temperature range is usually -60 ~ +130 °C, but the cooling rate of the temperature range is different, according to different test requirements, high and low temperature test chamber temperature range is -55 ~ +80°C, and some -40～+80°C.
There are two ways to change the temperature of the high and low temperature test chambers, which are the average cooling rate and the linear temperature and cooling speed. The overall average speed refers to the ratio of the difference between the maximum temperature and the minimum temperature to the time within the variable temperature range of the test box. The linear temperature rise/fall speed refers to the guaranteed temperature change rate during any arbitrary time period of 5 minutes. In fact, for high and low temperature test chambers, the most difficult and most critical section to ensure the linear temperature rise and fall is the cooling rate that the test chamber can achieve during the last 5 min of the cooling section. Therefore, the high and low temperature test chambers are preferably provided with the two parameters of the average temperature drop rate and the linear temperature rise and fall speed (average speed every 5 minutes). Generally speaking, the linear temperature rise and fall speed (average speed every 5 minutes) is the average temperature drop rate of the whole course. 1/2.
The development of modern high-low temperature test chambers plays a crucial role in the development of industry. We need to pay attention to the development of high-low temperature test chambers. Driven by modern science and technology and productivity, the instrument that was originally used as a measuring instrument has developed into a relatively complete discipline and has played an increasingly important role in the development of today's national economy and science and technology.
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