Liquid nitrogen tank, named after the storage of liquid nitrogen,
The vacuum insulation material combined with aviation aluminum material greatly reduces the volatilization of liquid nitrogen and realizes sample freezing.
This “ability” allows liquid nitrogen tanks to play an important role in medical experiments, animal husbandry, and even industry!
This “ability” also depends on liquid nitrogen, and the cryopreservation ability will decrease if the liquid nitrogen is insufficient; the cryopreservation effect will no longer be used when the liquid nitrogen is used up!
You know, the reason why we judge that there is no liquid nitrogen in the liquid nitrogen tank is to avoid the liquid nitrogen being used up and not being replenished.
There are two ways to judge: one is to check regularly, and the other is to install a low-level alarm!
It is a more common method. Set the cycle yourself, use a solid wooden stick or ruler to probe into the bottom of the liquid nitrogen tank, wait for 5~10 seconds, and then take it out. The frosting height of the wooden stick/ruler is the liquid nitrogen level. high.
It should be noted that with this method: the wooden stick must be solid, and the plastic tube cannot be used; The reason for not using the observation method is that the liquid nitrogen tank is not a transparent tank, and the second liquid nitrogen tank is opened with white fog, blocking the line of sight.
Low level liquid nitrogen alarm
This method is suitable for larger liquid nitrogen tanks, or users with sufficient budget.
The low-level liquid nitrogen alarm has a chip inside and a temperature probe outside, which can read the liquid level height, and has a temperature alarm setting to avoid sample damage caused by not adding liquid nitrogen.