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Norhof #485 LN2 dispensing systems
Norhof manufactures liquid Nitrogen dispensing systems. The liquid Nitrogen is used as cooling medium and is taken from a storage vessel (Dewar) with low pressure (max. 300 mBar) and delivered (pumped) through a fill line to the receiver Dewar.
The #485 is designed to overcome the drawbacks of high pressure vessels. You may compare the Norhof system with a water tap, but instead of giving water, it gently delivers liquid Nitrogen, with a flow of 1 Liter/minute.
Working principle
The pressure above the liquid level inside the Dewar is built by heating a small amount of liquid in the bottom of the Dewar. With only up to 300 mBar of overpressure, the liquid will gentle rise out of the rise pipe and fall into the fill hose. Because we evaporate some of the liquid to build pressure, there is no adding of ice inside the Dewar, such as with manual systems which use air from the environment. In these systems a pressure less storage Dewar is used as a reservoir for LN2. On the Dewar our unique dispensing system is mounted. Inside the housing of the pump a microprocessor is used to control the system.
Thanks to our unique static pump design there is:
-no need for a pressurized supply of LN2;
-no need for a cryogenic solenoid valve;
-no need for additional control instruments.
Norhof LN2 transfer system
Liquid Nitrogen (LN2) is used as the cooling medium and is taken from a storage vessel (Dewar) with low pressure (max. 300 mBar) and delivered (pumped) through a fill line to the application in a micro dosing way.
The Norhof 485 transfer system is designed to overcome the drawbacks of Cryogen under pressure in which a solenoid valve is used to switch the supply ON / OFF. You may compare the Norhof system with a water tap, but instead of giving water, it gently gives liquid Nitrogen, with a flow rate of 1 liter/minute. The system can pump up to 5 meters above the pump itself
The reservoir Dewar can safely stand next to your working place. When you need a small amount of LN2, the system is ready to supply by only pressing the button on the pump head. After pressing the button the system starts building a small over pressure, forcing the liquid gently to rise into the fill line, and fall into your little Dewar, or other small container. After pressing the button again, the system shuts off, and the flow stops.
