485 Manual LN2 pump

Specifications and Options


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.

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 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.

485 series Technical Specifications

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

485 series applications:

– 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.


Norhof pump stand

Norhof power transformer

Norhof Trolley

50 liter Dewar with trolley

50 liter Dewar with trolley strapped

12 liter Dewar

35 liter Dewar

50 liter Dewar

100 liter Dewar

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