NORHOF LN2 Dispensing System model #465
Manual controlled Liquid Nitrogen Dispensing system
Are you still poring LN2 into small vessels by hand?
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.
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 over-pressure, the liquid will gentle rise out of the rise pipe and fall into the fill hose. Because we evaporate some LN2 to build pressure, there is no adding of ice inside the Dewar, such as with manual systems which use air from the environment.
When LN2 is required, a small overpressure is generated by a small heater element in the LN2, and liquid flows out of the system like water from a tap, without spilling, noise, vibrations etc.
| Flow rate | 1 liter per minute | |
| Maximum working pressure | 300 mBar | |
| Reaction time | +/- 30 seconds for cooling down the fill line (with 0,80 meters fill line) | |
| Power connection | 115V / 230V AC input with supplied power supply or 12 Volt DC | |
| Power consumption | average 5 watt, during pumping 50 watt | |
| Model | 485-100-025 | 485-100-050 |
| Storage container volume | 25 Liter | 50 Liter |
| Outside dimensions (diameter) | 400 mm | 460 mm |
| Height dimensions (incl pump) | 881 mm | 917 mm |
| Weight (empty) | 14 kg | 17 kg |
| Static holding time (days) | 104 days | 122 days |
| Standard fill line | 0,8 m line length, 9,5 mm OD, 7 mm ID, Teflon FEP tube, with 32 mm OD Armaflex foam insulation | |
| System includes | Dewar, pump, fill line, phase separator and power supply | |
| Alarms/warning acoustical/ visual | Dewar empty, Dewar 4 liters left, broken sensor(s), frozen alarm | |
| Safety | Mechanical overpressure protection valve | |
| Options | Transport trolley 5 wheels (10 cm height) Stand for pump (when Dewar is refilled) | |
| Dewar Trolley option | 900-400-025 | 900-400-000 |
| Floor Stand option | 900-400-100 | 900-400-100 |
* pump can be used on other type dewars as long as the Dewar has a NW50 flange
– hand-controlled filling of small dewars;
– hand-controlled cooling of small objects;
– hand-controlled freezing of small samples;
– hand-controlled filling of Dry Shippers;
– hand-controlled cooling of small chemical reactions.
