Cryo EM technology has been widely applied in the fields of biology, chemistry, and materials science in recent years, especially in high-resolution structural biology research, becoming an important tool. Cryo electron microscopy relies on rapidly freezing the sample to prevent water from freezing into crystals, thereby maintaining the structure of biomolecules and other samples in their natural state.
The fully automatic liquid nitrogen generation device for cryo electron microscopy is a crucial part of cryo electron microscopy experiments, typically used to provide the required low-temperature environment for frozen samples. In order to ensure the stability, reliability, and efficiency of operation, the liquid nitrogen generation device must have a fully automated control system that can accurately regulate and maintain the supply and temperature of liquid nitrogen.
The working principle of the fully automatic liquid nitrogen generation device for cryo electron microscopy
Automatic replenishment of liquid nitrogen
The device is connected to the cooling system of the cryo electron microscope through a liquid nitrogen tank. Liquid nitrogen will gradually evaporate during use, and the device is equipped with a liquid level monitoring system that automatically monitors the liquid nitrogen level through sensors. When the liquid level drops to the preset lower limit, it will automatically trigger liquid nitrogen replenishment.
Once the liquid nitrogen is consumed to a certain extent, the system will automatically activate the liquid nitrogen supply valve to introduce liquid nitrogen from the storage tank into the refrigeration system, ensuring a continuous and stable supply of liquid nitrogen.
Temperature monitoring and control
The fully automatic liquid nitrogen generation device will be equipped with a temperature sensor to monitor the system temperature in real time. The system can accurately adjust the liquid nitrogen flow rate according to the demand to maintain the low-temperature environment of the cryo electron microscope.
By adjusting the inflow rate and flow rate of liquid nitrogen, the device can precisely control the temperature of the sample and cooling area, ensuring that the appropriate freezing state is maintained throughout the operation.
Gas evaporation and circulation
During the process of supplementing liquid nitrogen, some liquid nitrogen will evaporate into gas. Fully automatic liquid nitrogen generation devices are usually equipped with gas recovery systems, which can recover evaporated nitrogen gas and recycle it to improve efficiency and reduce costs.
The evaporated nitrogen gas is transported to the outside through pipelines or released through filtering devices.
Liquid nitrogen consumption prediction and alarm system
The device is equipped with advanced algorithms that can predict the consumption rate of liquid nitrogen and calculate the time and quantity of liquid nitrogen replenishment in advance based on the current usage situation. When the liquid nitrogen is about to run out, the system will issue a warning to remind the operator to replenish it in a timely manner to avoid the interruption of liquid nitrogen affecting experimental operations.
Main components and functions
Liquid nitrogen storage tank
Usually, high vacuum insulated liquid nitrogen storage tanks are used to ensure that the low temperature during liquid nitrogen storage is not easily lost, and to maintain long-term low-temperature storage of liquid nitrogen.
Liquid level sensor and liquid nitrogen replenishment system
Real time monitoring of liquid nitrogen storage status through liquid level sensors, connected to an automatic replenishment system to ensure stable liquid nitrogen supply.
Temperature Control System
Accurately adjust and control the temperature of the sample cooling system, usually including thermocouples, temperature control modules, etc., to maintain the system within the desired temperature range through electronic control.
Nitrogen recovery device
By condensing and recovering the pipeline system, the evaporated nitrogen is recovered and reused, thereby improving the efficiency of the system.
Alarm and display system
Equipped with a digital display screen, it can display important parameters such as temperature, liquid level, and flow rate of liquid nitrogen in real time. The alarm system can issue warnings when there is insufficient liquid nitrogen or abnormal temperature, ensuring that operators take timely measures.
Automated control system
The automation control system is the core part of the liquid nitrogen generation device, which can intelligently adjust the supply of liquid nitrogen based on real-time data such as liquid level, temperature, and flow rate, reduce human intervention, and ensure the accuracy and stability of the cooling process.
Advantages of fully automatic liquid nitrogen generation device
automated operation
The automation control system greatly reduces manual intervention, making the operation more convenient, avoiding human errors, and ensuring a stable supply of liquid nitrogen during cryo electron microscopy experiments.
High Efficiency and Energy Saving
By optimizing the supply and recovery system of liquid nitrogen, the fully automated device can effectively utilize liquid nitrogen, reduce waste, and lower costs.
Accurate temperature control
The equipment can monitor and adjust the flow and supply of liquid nitrogen in real time, ensuring precise control of the cooling system temperature and avoiding the impact of temperature fluctuations on the sample.
安全性高
The liquid nitrogen generation device is usually equipped with a series of safety protection devices, such as liquid nitrogen leak detection, over temperature alarm, pressure protection, etc., to ensure the safety of the experimental process.
method
Device preparation
Ensure the correct connection between the liquid nitrogen storage tank and the cryo electron microscopy system, and check the working status of all pipelines and control modules.
Start the system
Start the automated liquid nitrogen generation device and check if the temperature control and liquid level monitoring of the system are working properly.
Temperature monitoring and regulation
Set the required temperature range (usually below -180 ° C) to ensure that the system can automatically adjust the liquid nitrogen flow rate according to demand and maintain the low temperature state of the sample.
Operation and observation
During operation, monitor parameters such as liquid level, temperature, and flow rate to ensure that all functions are functioning properly. When the liquid nitrogen level approaches the preset lower limit, the system will automatically replenish liquid nitrogen.
End operation
After the experiment, turn off the liquid nitrogen supply system, record the liquid nitrogen consumption, clean the device, and ensure the long-term stability of the system.
summary
The fully automatic liquid nitrogen generation device for cryo electron microscopy ensures that samples can be rapidly and stably frozen in a low-temperature environment through automated control technology and efficient liquid nitrogen supply and recovery systems, avoiding water crystallization phenomena. By precisely controlling the temperature and liquid nitrogen level, this device can improve the efficiency and stability of experiments, while reducing liquid nitrogen consumption, providing a more reliable guarantee for the application of cryo electron microscopy technology.