How to reduce the temperature deviation of the high-low temperature damp heat test box The uniform temperature is a very important condition for the working space of the high-low temperature damp heat test box, because the non-uniform temperature will make the test condition of the test article not reach the standard, probably because of the temperature of a certain part. High or low, resulting in unreliable data from the test, and the failure of the test.
High-low temperature damp heat test chamber temperature level and deviation description:
High-low temperature damp heat test box It is mainly used for industrial simulation of high temperature, low temperature test, to detect chemical industry, automotive industry, medical units and other related industries in the high temperature, low temperature, alternating performance changes, reflecting the most accurate indicators. The widest range of temperature control available in the latest version of the high-low temperature hot and humid test chamber makes the balance of its performance indicators reach the national technical requirements.
The high-low temperature damp heat test box is often used to evaluate the temperature value change of the product under test, so that it has a kind of performance that can prevent the variation of the temperature deviation, and the accuracy of the experimental results can be guaranteed without error. When the equipment is subjected to alternation test, it can also ensure that the metal sample does not undergo chemical reactions during the experiment, which will affect the corrosion resistance of the equipment itself. (Note: When the high-low temperature damp heat test box simulates the temperature change law in the natural environment , must be carried out under the experimental conditions specified by the equipment).
Confirm that the temperature level and deviation of the high-low temperature hot and humid test chamber is one of the key points for the final determination of which type of test equipment the customer decides to purchase. The following are some relevant parameters of the temperature deviation of the high and low temperature damp heat test box.
1. The temperature deviation of the high-low temperature damp heat test box is not more than ±2°C, and the high temperature temperature class is: 30°C, 40°C, 55°C, 70°C, 85°C, 100°C, 125°C, 155°C, 175°C, 200 °C (customizable).
2. The low temperature deviation of the high and low temperature test chamber is not more than ±3°C, and the low temperature grade is: 5°C, -5°C, -10°C, -25°C, -40°C, -55°C, -65°C (can be customized ).
3, the temperature uniformity of high and low temperature damp heat test box at high temperature and low temperature should not exceed 2.0 °C.
4. The temperature fluctuation of high-low temperature damp heat test box is not more than ±0.5°C at high temperature; ±1.0°C at low temperature.
5. The difference between the working chamber wall temperature and the working space temperature: The difference between the working chamber wall temperature and the working space temperature of the high-low temperature damp heat test chamber test box should not exceed 3% of the test chamber temperature at high temperature, and should not exceed 8 at low temperature. %.
6, temperature and humidity temperature test chamber heating and cooling rate:
Under full load conditions, the rate of uniform temperature rise and cool down every 5 min is: no more than 1°C/min, 1±0.2°C/min, 3±0.6°C/min, 5±1°C/min.
7. Because the high-low temperature damp heat test box uses the blower principle to ensure the uniformity in the box, the wind speed in the working space should be adjustable, but the equipment is not mainly used for wind proof test, so only the standard value is used: 3.7 m/s .
To reduce the temperature deviation of the high-low temperature damp heat test box:
1, as far as possible to achieve high and low temperature damp heat test box structure, design is reasonable and perfect.
2. In order to make the wind evenly, when using two fans, one left-handed and one right-handed should be taken care of.
3, choose a good performance thermal insulation material to prevent local air leakage or reduce heat loss.
4. Increase the wind speed under the conditions allowed by the test conditions to increase the flow of air in the tank, eliminate the dead zone, and make the temperature in the tank uniform.
5. For refrigerators like laboratories, air can be supplied from the top of the box to achieve the goal of small wind speed and uniform indoor air temperature.
6. For the high-low temperature damp heat test box, continuous adjustment of the heating power by PID can reduce temperature fluctuations. Usually after the set temperature is reached, the refrigerator is always on, and the controlled heating power is used to balance the excess cooling capacity. Save energy and improve control accuracy.
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