• 455 Manual Pump On 35 Liter Dewar 1
  • 455 Manual Pump Closup

455 Manual click-on LN2 pump

Specifications and Options


Norhof LN2 microdosing systems

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 LN2 microdosing system is designed to overcome the drawbacks of LN2 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 an adjustable flow, possible to regulate from some drops, up to 1 Liter/minute. Our pump can pump LN2 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 on the pump head. By pressing on the pump head, 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 LN2 container. After your pressure on the pump head is released, the system shuts off automatically, 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 100 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.

455 series Technical Specifications

Static evaporation rate < 0,5 liters per day
Flow rate Dripping up to 2 Liter/minute (not adjustable)
Maximum working pressure < 200 mBar
Reaction time 10-40 seconds (depending on level in Dewar)
Power connection 115V / 230V AC with supplied power supply or 12 Volt AC/DC
Power consumption average 10 Watts, during pumping 50 watts
Storage container volume 35 Liter 50 Liter
Outside dimensions (diameter) 480 500  mm
Height dimensions  643 727  mm
Weight (empty, full) 13 /  41,5 17 / 57,5  kg
Options Transport trolley 5 wheels (12 cm height)

Stand for pump (when Dewar is refilled)

* pump can be used on other type dewars as long as the Dewar has a NW50 flange

455 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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