What should I consider when a lab teacher purchases a small vacuum freeze dryer?

What should I consider when a lab teacher purchases a small vacuum freeze dryer?
University or university procurement staff are purchasing small vacuum freeze dryers for the laboratory. There are two kinds of people: one is to understand their own needs and have an understanding of vacuum freeze dryers; the other is vacuum freeze dryers. Do not understand. The former is easier to communicate and understand, and can directly provide the corresponding model selection, while the latter needs to be introduced according to its focus (such as freeze dryer price, model type, use, etc.), the latter often paranoid about price issues. It is generally recommended that the budget is sufficient and that you can consider importing freeze dryer equipment (if you can provide the price of imported equipment, we can also provide the configuration of the corresponding imported equipment).
If the budget is not enough, you really need to consider the following factors:
The three parameters of the cold trap temperature, the amount of ice, and the ultimate vacuum determine the value of the small vacuum freeze dryer. A cold trap is a device for trapping steam between a freeze-drying chamber and a vacuum pump. The lower the cold trap temperature, the stronger the trap capability of the cold trap, but the lower the cold trap temperature, the higher the cooling requirements, and the higher the machine cost and operating cost. The cold trap temperature of the laboratory freeze dryer of Beijing Songyuan mainly has three grades of -50 °C, -60 °C, and -80 °C. The lyophilizer with a cold trap temperature of -50 °C is suitable for lyophilization of water solvent or solvent freezing point above -40 °C. The effect of cold trap temperature on water trapping capacity indicates that the temperature of the cold trap drops from -35 °C to -50. °C, the water catching capacity is obviously improved, the cold trap temperature is lower than -50 °C, and the water trap capacity of the cold trap is not significantly improved. Therefore, in the absence of special needs, the cold trap temperature of -50 °C can be selected. The lyophilizer with a cold trap temperature of around -80 °C is suitable for most products such as lyophilization of products containing organic solvents or lyophilization of some special products.