As a rare equipment in the laboratory, most customers find it difficult to judge the quality of liquid nitrogen generators based on technical parameters, and often fall into the misconception of "only choosing low prices". Starting from the differences in core configurations, this article elaborates on the price influencing factors of the 10L/Tianji model, helping customers accurately judge its value.

Some manufacturers claim that the daily production of 10 liters of liquid nitrogen is severely inflated, and even 6 liters per day cannot be achieved. In addition, the following nine factors also have a significant impact on prices.

1、 Low temperature refrigeration process

A reliable liquid nitrogen generator should use batch commercial refrigerators with CE certification, such as GM refrigerators or hybrid pulse tube refrigerators. The initial cost is high, but the technology is mature and compliant, which can greatly improve system stability and long-term service life.

The refrigeration machines of low-cost liquid nitrogen generators on the market have significant hidden dangers, such as small factories producing and filling non-standard refrigerants with stacked refrigerant compressors - which have a short lifespan (can be damaged within a few years), high refrigerant leakage rates, and lack of reliability certification, making it difficult to repair problems in the later stages.

2、 Core storage and auxiliary accessories

-Built in liquid nitrogen tank: The price difference between 20 liter and 35 liter vacuum insulated tanks is significant, and the different insulation performance can lead to a price difference of more than twice for customized tanks. In addition, whether the liquid nitrogen tank comes with pressure vessel certification is also a major factor affecting the price.

-Auxiliary components: globe valve, safety valve, level gauge and other accessories, with vastly different prices.

3、 Infusion and Insulation System

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Configuration: Imported low-temperature solenoid valve+emergency shut-off valve+vacuum insulated tube are used for convenient and safe infusion.

-Low end configuration reduction: Only domestic low-temperature shut-off valves are used, omitting low-temperature solenoid valves and vacuum insulation pipes, significantly reducing costs but decreasing practicality.4、 Heat dissipation and cooling system

Built in chiller

Equipped with cooling effect and reliable heat dissipation, it can operate at an ambient temperature of 32 ℃,

The optimized version controller can display various operating parameters and fault alarms.

Air cooled condenser (copper tube+fan)

Without cooling capacity, it relies on environmental heat dissipation and can only operate at 25 ℃. It is prone to high temperature alarms without any parameter display.

5、 Electrical control system

-Touch screen: The purchase price of a 10 inch resistive screen is more than five times the price of a 4.3/7-inch screen.-Core components: Siemens PLC prices are much higher than domestic PLCs; German switching power supplies are more expensive than domestic ones; Some manufacturers cut corners and omit air switches and AC contactors for electrical components.

6、 Core differences of nitrogen generatorpurity

The purity of membrane nitrogen generators is generally below 98%, which can easily accumulate carbon dioxide and water vapor, leading to a decrease in preparation efficiency and requiring frequent blowing; The purity of the pressure swing adsorption (PSA) nitrogen generator is better than 99%, making it more suitable for liquid nitrogen generators.

Cost and Components

Membrane nitrogen generators do not require excessive solenoid valves, resulting in lower costs, and the lifespan of some imported nitrogen membranes is only 3-4 years;

7、 Differences between Domestic and Imported Brand Components

Built in air compressor: The service life of European and American brand air compressors is over 10000 hours, and the price is more than 5 times that of domestic ones;

Electrical components: PLCs, touch screens, and switch power supplies from European and American brands are priced higher than those from domestic brands;

Some manufacturers have reduced the configuration and omitted electrical components such as air switches and AC contactors.

Electromagnetic valve/pressure sensor: The price of imported European and American brands is more than three times that of domestic brands, with better reliability.

Pressure reducing valve/quick connector/hose: European and American brands have a long service life, are not prone to air leakage, and are priced 5-10 times higher than domestic brands.

8、 Additional Services and Guarantees

-Value added accessories: Are cryogenic protection kits and maintenance toolkits included as gifts.