Liquid nitrogen container are often used to store low temperatures, require a certain amount of liquid nitrogen, how to determine the residual amount of liquid nitrogen, and timely replenish liquid nitrogen?
Insert a wooden ruler into the center of the bottom of the container and take it out after about 10~15 seconds. The frosting length is the liquid level. Do not check with a hollow tube to prevent liquid nitrogen from escaping from the tube.
The liquid level should not be lower than the high surface of the refrigerated object, and the liquid nitrogen should be submerged. Liquid nitrogen should be replenished in time when liquid nitrogen is vaporized until the cold storage is to be exposed.