608 LN2 Automatic FTIR Detector filling system

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 4 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.

Software

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

608 Series FTIR Adaptors

Standard we have adaptors to fit on systems of Bruker, Netzsch, Shimadzu, Thermo Fisher, Perkin Elmer, Agilent, Horiba, Mettler Toledo but also for other detectors we have adaptors available or make a tailor-made design.

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