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Choose constant temperature and humidity test chamber can not only look at the price

2019-01-07 18:17:51  

The selection of constant temperature and humidity test chamber shall not only depend on the price, but also on the system structure and relevant configuration, such as:

1. Control system: the control system is the core control part of the constant temperature and humidity test box, which determines the heating rate, accuracy and other important indicators of the constant temperature and humidity test box. At present, most of the controllers of the test chamber adopt PID control, and a few adopt the control mode combining PID and fuzzy control. Because the control system basically belongs to the category of software, and this part in the use process, generally will not appear the problem.

2. Humidity system: the humidity system of the constant temperature and humidity box is divided into two subsystems: humidification and dehumidification. The humidification method of the constant temperature and humidity test chamber is generally steam humidification method, that is, low-pressure steam is directly injected into the test space to humidify. This humidification method has high humidification capacity, fast speed and sensitive humidification control, especially when the temperature is lowered, it can easily achieve forced humidification.

There are two dehumidification methods in the constant temperature and humidity test chamber: mechanical refrigeration dehumidification and drying dehumidification. The dehumidification principle of mechanical refrigeration dehumidification is to cool the air below the dew point temperature, so that more than saturated moisture moisture condensation precipitation, so as to reduce the humidity. Dryer dehumidification is the use of air pump to constant temperature and humidity test chamber of air extraction, and dry air injection, at the same time wet air into the recycling of the drying chamber for drying, dry and then into the test chamber, so repeated cycle of dehumidification. Now most of the constant temperature and humidity test chamber adopts mechanical refrigeration dehumidification method, and drying dehumidifying ways, can make the dew point temperature is below 0 ℃. Suitable for places with special requirements, but the price is more expensive.

3. Sensor system: the sensor of constant temperature and humidity test chamber is mainly temperature and humidity sensor. There are two methods to measure humidity: dry and wet bulb thermometer method and solid state electronic sensor direct measurement method.

4. Air circulation system: the air circulation system of the constant temperature and humidity test chamber is generally composed of centrifugal fan and motor driving its operation. It provides a constant temperature and humidity test chamber in the air circulation.

Therefore, in terms of composition, different components and different structural principles, it will cause the price difference of constant temperature and humidity test chamber. To take a simple example, the price of the same mobile phone will vary according to the chip used. Snapdragon processors and mediatek chips have been a long way off from apple.

Moreover, it is not only the influence of the hardware itself, but also the coordination and operation of various systems need strong technical experience to control. Some machines run for a long time without problems, while some machines break down continuously after being used for a short time. This hidden price difference will also be reflected in the purchase process.


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