-How to choose a level gauge for a liquid nitrogen storage tank at 196℃

In an extremely low temperature environment of -196°C, selecting an appropriate level gauge is indeed a critical issue. Liquid nitrogen storage tanks generally require special level gauges to handle extreme low temperatures. Here are some possible options along with some discussions: 1. **Float level gauge**: A float level gauge is a mechanical type of level gauge, typically suitable for low-temperature liquids. It operates on the principle of buoyancy and is suitable for liquids such as liquid nitrogen. However, it is necessary to ensure that the materials and seals can withstand extremely low temperatures to prevent air leakage or freezing. 2. **Ultrasonic level gauge**: Ultrasonic level gauges can typically operate at extremely low temperatures, and they do not need to be in direct contact with the liquid. However, it is necessary to ensure that the materials and components of the ultrasonic sensor can withstand low-temperature environments. 3. **Differential pressure level gauge**: A differential pressure level gauge can create a differential pressure between the liquid level and the bottom of the container, thereby measuring the liquid level. This method is generally suitable for liquid nitrogen storage tanks, but it requires the use of materials resistant to low temperatures. 4. **Radar level gauge**: You have already mentioned radar level gauges, and these are usually a viable option, as radar sensors do not come into direct contact with the liquid and can operate in low-temperature environments. However, it is necessary to ensure that the materials and electronic components of the radar level gauge are suitable for use in low temperatures. It is very important to take insulation measures during design to prevent the sensor components from freezing or being damaged. Furthermore, given the properties of liquid nitrogen, it is also important to choose sealing and safety measures that can prevent its evaporation and leakage. The final choice should depend on your specific requirements, budget, and the feasibility of system integration. It is recommended to consult a professional level gauge manufacturer or engineer, as they can provide you with more specific advice and solutions. .

For this, it can be connected to the differential transformer using a regular instrument tube. Above the liquid surface is the negative-pressure tube, while at the bottom of the liquid surface is the positive-pressure tube. For reference.

The liquid nitrogen tank on site serves as the differential pressure gauge; we also create a pressure tapping on the pressure lead pipe and install a differential pressure transmitter there to enable remote display.

Uses stainless steel pressure transfer tubes, so it’s not afraid of low temperatures!