Teach you how to distinguish between constant temperature and humidity test chamber and high and low temperature test chamber
The constant temperature and humidity test chamber and the high and low temperature test chamber are two product names. Many people will think that there is a big difference. In fact, they belong to the same series of products. , Can achieve damp heat test, and the high and low temperature test box is pure high temperature, low temperature switching test, different from the constant temperature and humidity test box, its low temperature is far more than 0 ℃, but has a variety of ranges: A: -20 ℃ ～ 150 ℃ B: -40 ℃ ～ 150 ℃ C: -60 ℃ ～ 150 ℃ D: -70 ℃ ～ 150 ℃ E: -80 ℃ ～ 150 ℃, if the user needs a lower temperature, -220 ℃ Low temperature box within.
The humidification system of the constant temperature and humidity test chamber is a shallow humidification method. The humidifier control method: non-contact equal-cycle pulse width adjustment, SSR (solid state relay), humidity control are all controlled by PID + SSR system with the same channel, with automatic water level Compensation and water shortage alarm system are used. The humidification water needs to use pure water or distilled water. It is not recommended to use tap water, so as not to block the water pipe or affect the test effect. The standard test box of our company is to use external manual water addition. When filling water, our company can install automatic water replenishment device, so that you don't need to add water frequently by hand, which is more convenient to use.
High and low temperature test chamber-The low temperature within -80 ℃ is realized by a general mechanical compressor. The refrigeration cycle adopts the reverse Carro cycle. The cycle is composed of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is compressed The machine is adiabatically compressed to a higher pressure, consuming work to increase the temperature of the exhaust gas, and then the refrigerant is isothermally exchanged with the surrounding medium through the condenser to transfer heat to the surrounding medium. After the refrigerant passes through the shut-off valve for adiabatic expansion to do work, the refrigerant temperature decreases. Finally, the refrigerant absorbs heat isothermally from the object with a higher temperature through the evaporator, thereby lowering the temperature of the object to be cooled. This cycle is repeated to achieve the purpose of cooling. If it is a lower temperature, liquid nitrogen is used for cooling. The liquid nitrogen tank has a double-layer coiled glass reactor: the outer layer can be evacuated and insulated, and the kettle is replaced by corrosion and temperature resistance. Heated coil heating and cooling, temperature rise and fall, double-layer glass reactor with insulation jacket: insulation jacket insulation, with light-transmissive window (can be vacuumed or placed in anhydrous honeycomb calcium chloride, etc., the glass surface on the window is not frosted at low temperature) , The interlayer is heated and cooled by heat conduction oil.
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