608 LN2 Automatic refilling FTIR Detector / Electron Microscopy (SEM, TEM, FIB, Cryo-EM)

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NORHOF LN2 Microdosing System #608

LN2 Automatic filling FTIR Detector / Electron Microscopy (SEM, TEM, FIB, Cryo-EM)

The Norhof #608 LN2 microdosing system is a universal, automatic liquid nitrogen filling solution designed for a wide range of laboratory applications. Originally engineered for FTIR detector refilling, the system is now widely adopted for safe, unattended, and precise LN2 delivery to Dewars serving:

FTIR Detectors (MCT, FPA)
Scanning Electron Microscopes (SEM)
Transmission Electron Microscopes (TEM)
Focused Ion Beam (FIB) Systems
Cryo-Electron Microscopes (Cryo-EM)
Other small LN2-cooled laboratory instruments

Adapters are tailor-made for seamless integration with leading brands and custom setups

Key Features of the Norhof LN2 auto-fill system:

Universal Compatibility:
Custom adapters for Bruker, Netzsch, Shimadzu, Thermo Fisher, Perkin Elmer, Agilent, Horiba, Mettler Toledo, JEOL, FEI, Zeiss, Hitachi, Thermo Fisher Scientific and more.
Plug-and-Play Operation:
Easy setup with most detectors and Dewars; no special tooling required.
Gentle, Precise Filling:
Adjustable microdosing from a few drops up to 0.5 L/min, ideal for sensitive detectors and cryo-stages.
Timed and On-Demand Refills:
Schedule fills at preset intervals or trigger manually/externally to avoid interrupting measurements.
Safe and Clean:
No operator contact with LN2; low-pressure operation (<300 mBar) for maximum safety in the lab.
No Ice Formation:
Pressure is generated by internal LN2 vaporization, preventing air ingress and ice buildup.
Quiet, Vibration-Free:
No solenoid valves or noisy pumps—ideal for sensitive instruments.
Overnight and Unattended Operation:
Supports long measurement runs and continuous instrument cooling.

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 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

Flow rate	Up to 0,5 liter per minute
Average working pressure	100 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 watt, during pumping 50 watts
Model	608-100-035	608-100-050	608-100-100
Storage container volume	35 Liter	50 Liter	100 Liter
Outside dimensions (diameter)	460 mm	460 mm	500 mm
Height dimensions	802 mm	917 mm	1235 mm
Weight (empty, full)	15 / 42 kg	17 / 59 kg	34 / 115 kg
Static holding time (days)	112 days	122 days	164 days
Standard fill line	1,6 m line length, 6,25 mm OD, 4 mm ID, Teflon FEB tube, with 32 mm OD Armaflex foam insulation
System includes	Dewar, pump, fill line 1,6 m, phase separator, fill tubes, power supply, cables, 1 level sensor, 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 4 liter LN2 left, broken sensor(s), frozen alarm, mechanical overpressure protection valve.
Options	Tailor-made Adaptor with sensor for all brands of detectors Custom built adaptor to fixate sensor(s) on application Transport trolley 5 wheels (10 cm height) Stand for pump (when Dewar is refilled)
Dewar Trolley option	900-400-000	900-400-000	900-400-000
Floor Stand option	900-400-100	900-400-100	900-400-100
Custom made adapter	600-400-000	600-400-000	600-400-000

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.

We regularly supply adapters for FTIR instruments from well-known suppliers such as:

– Bruker
- Lumos, Lumos II, IFS 125HR, Hyperion, Hyperion II, Matrix, Vertex 80, Vertex NEO and more
– Thermo Fisher Scientific
- Nicolet iS50R, Nicolet iN10 MX and more
– Agilent Technologies
- Cary 620 and more
– PerkinElmer
- Spotlight 400, Spotlight Aurora and more
– Jasco
– Shimadzu
– MKS Instruments
- Multigas 2030 and more
– Horiba
- Mexus-One, FTX-One and more
– Phasetech
- 2DMCT and more
– FTIR dewars of Kadel and IR Associates

If your instrument brand is not listed here, please contact us for a bespoke adapter solution. Thanks to our extensive experience, we can accommodate almost any FTIR Dewar configuration.

608 Series Adapters for Electron and Ion Microscopy (SEM, TEM, FIB, Cryo-EM) instruments

Norhof offers tailored adapters and integration kits for nearly every microscopy brand, including JEOL, FEI/Thermo Fisher Scientific, Zeiss, Hitachi, Leica, Tescan, and more. If your instrument requires a unique interface, our engineering team develops custom solutions to ensure a perfect fit.

We regularly supply adapters for Electron and Ion Microscopy (SEM, TEM, FIB, Cryo-EM) instruments from well-known suppliers such as:

– JEOL
- NEOARM, JEM-ARM200F, JEM-120i, JEM-200, JEM-1400, JEM-2100, and more
– FEI/Thermo Fisher Scientific
- Scios Cryo-FIB, Quattro S Cryo ESEM, Quanta 200 DEM, Dualbeam chamber port G3 or G4 and more
– Zeiss
- Quorum/Linkam cryo‑systems on Crossbeam 540/550 and more
– Hitachi
- S‑4700 / S‑4800 / S‑3400 / S‑3700 / S‑4100 / S‑4300 field‑emission SEMs with LN2 cold trap, SU‑70 / SU‑8000 series and other modern Hitachi FE‑SEMs with integrated LN2 trap option and more
– Leica
- EM VCT100 and EM VCT500 cryo stage / docking station and more
– Tescan
- AMBER 2 cryogenic Ga FIB‑SEM, AMBER X2 plasma FIB‑SEM, S8000G FIB/SEM in cryo configuration and more
– Dewars of Microscopy Solutions and more

If your instrument brand is not listed here, please contact us for a bespoke adapter solution. Thanks to our extensive experience, we can accommodate almost any Dewar configuration.

For more information or personalized advice, please contact our technical team.

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