Understanding and operating method of incubator
[Recognize the organization structure of the thermostat] The thermostat is also called a constant temperature and humidity test chamber, and the general industry is collectively called environmental test equipment. The constant temperature and humidity test chamber is composed of a box body, a refrigeration system, an air circulation system, a heating system and a humidity control system. The air circulation system generally adopts a structure that can adjust the direction of air supply; the humidification system has two types: boiler humidification and surface evaporation; the cooling and dehumidification system uses air-conditioning working structure cooling structure; the heating system uses electric heating fin heating and electric furnace wire direct heating Two kinds of structure; temperature and humidity test method adopts dry and wet bulb test method, and also directly measure method with humidity sensor; control and display operation interface adopt temperature and humidity separate and temperature and humidity combined controller and other methods.
While operating the constant temperature and humidity test chamber, correct operation of the constant temperature and humidity test chamber is helpful to obtain scientific data for the tester, and the role and significance of scientific operation of the constant temperature and humidity test chamber should be fully understood. In the suitability of operating the constant temperature and humidity test chamber, the following principles should be fully followed to conduct the test.
First of all, when doing environmental tests, you should be familiar with the required sample performance, test conditions, test procedures and test techniques, the technical performance of the test equipment used, and the structure of the equipment, especially Be familiar with the operation and performance of the controller. Also read the operation manual of the test equipment carefully, so as to avoid the abnormal operation of the test equipment caused by the operation error and damage the test sample, and the test data is incorrect.
Secondly, choose the test equipment reasonably. In order to ensure the normal operation of the test, the appropriate test equipment should be selected according to the different conditions of the test sample. A reasonable ratio between the test sample of the constant temperature and humidity test chamber and the effective volume of the test chamber should also be maintained. For the test of the fever test sample, its volume shall not be greater than one tenth of the effective volume of the test chamber. For the non-heat test sample, the volume should not be greater than one-fifth of the effective volume of the test chamber.
In addition, for the environmental test of the medium required for the test, it should be added correctly according to the test requirements. For example, there is a certain requirement for the water in the damp heat test chamber, and the resistivity should be reduced. There is a kind of pure water on the market that is more economical and convenient, and its resistivity is equivalent to distilled water.
Finally, the use of damp heat test box. The wet ball gauze (wet ball paper) used in the damp heat test chamber has certain requirements, not any gauze can be substituted, because the relative humidity reading is the root distance is the difference between temperature and humidity, strictly speaking, it is also related to the local atmospheric pressure and wind speed at the time . The wet bulb temperature indication is related to the amount of water absorbed by the gauze and the evaporation of the surface. These are directly related to the quality of the gauze, so the weather stipulates that the wet ball gauze must be a special "wet ball gauze" woven from linen. Otherwise, it is difficult to ensure the correctness of the indication of the wet bulb thermometer, that is, the correct humidity. In addition, the placement of the wet ball gauze is also clearly stipulated. The length of the gauze is 100 mm. The sensor probe is tightly wound. The probe is 25-30 mm away from the humidity cup. The gauze is immersed in the cup, so as to ensure the correct control of the device and the correctness of humidity.
At the same time, place the test sample correctly. The location of the test samples should be more than 10cm away from the wall of the box, and multiple samples should be placed on the same plane as much as possible. The sample should be placed so as not to block the air outlet and return air outlet, and leave a certain distance for the temperature and humidity sensor. To ensure the correct test temperature.
It can be said that correct operation of the test process of the constant temperature and humidity test chamber is conducive to greatly improving the accuracy of the test data. Adhering to the above principles, it should be said that a successful temperature and humidity test can be done.
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