• Pump On 35 Liter Dewar
  • Norhof FTIR Pump Adaptor Mounted On FTIR Dewar Closup
  • Norhof FTIR Pump Adaptor Mounted On FTIR Dewar
  • Norhof FTIR Pump Adaptor Closup
  • Norhof FTIR Pump Adaptor
  • 900 Series Automatic Advanced Pump
  • 900 Series Automatic Advance Closup
  • 900 Automatic Advance On 50 Liter Dewar2
  • 900 Automatic Advanced With Laptop Closup
  • 900 Automatic Advanced Closup2

608 LN2 Automatic FTIR Detector filling system

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.


To display sensor temperatures, vessel pressure, status of LED’s on the pump etc. our Norhof Monitoring software is included with any #608 series pump. This software works under Windows ’98 – 2000 – ME – NT – Vista – W7 – Windows 10 – Windows 11



With each #608 system a software Datalogger function is included. This recorder allows you to document any parameter value over time and to preset the time interval for your detector.

608 series Technical Specifications

Static evaporation rate < 0,5 liters per day
Flow rate Pre-set on 40 mBar (adjustable with the supplied software)
Maximum working pressure < 300 mBar
Reaction time +/- 1 minutes for cooling down the fill line (with 1.6 meters fill line)
Power connection 115V / 230V AC with supplied power supply or 12-24 Volt AC/DC
Power consumption average 10 Watts, during pumping 50 watts
Storage container volume 35 Liter 50 Liter 100 Liter
Outside dimensions (diameter) 480 500  mm 500 mm
Height dimensions  791 875  mm 1235 mm
Weight (empty, full) 13 /  41,5 kg 17 / 57,5  kg 32 / 113 kg
Standard fill line 6.25 mm OD, 4 mm ID PTFE tube, with 32mm foam insulation
System includes Dewar, pump, fill line 1.6 m, phase separator, power supply, cables, 2 level sensors, PC software.
Working modes Automatic fill control with timer (1 sensor)
External control 5 volt signals for ON, OFF and RS232 signals for ON, OFF
PC software Monitor software, to monitor pump and data logging
Alarms/warning                 acoustical/ visual / mechanical Dewar empty, Dewar 5 liters LN2 left, broken sensor(s), frozen

alarm, mechanical overpressure protection valve.

Options Adaptor with sensor for Bruker detectors

Adaptor for Shimadzu AIM8800 or similar

Custom built adaptor to fixate sensor(s) on application

Transport trolley 5 wheels (10 cm height)

Stand for pump (when Dewar is refilled)

608 Series FTIR Adaptors


Standard we have adaptors to fit on the Bruker detectors, and Shimadzu AIM8800, but for other detectors we have adaptors available.



The majority of this system finds use in the field of laboratories, research centers where FTIR measurements are made and where a safe and unattended refill of LN2 is required.


608 series applications:

– unattended automatic refill of LN2 for FTIR detectors
– refilling of laser detectors
– Overnight measurements
– Automatic sequences of measurements
– auto filling of other small LN2 reservoirs, with very low LN2 flowrate

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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