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NORHOF LN2 Microdosing System #900 Series

Norhof manufactures 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

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Product Specification

Automatic advanced programmable Liquid Nitrogen Microdosing system

Controllable LN2 flow, from some drops up to 1 liter/minute;
Several LN2 level control possibilities:
one temperature sensor and time;
two temperature sensors (high and low level);
PID control with one temperature sensor;
Full remote control by software and PC
Software monitoring and data logging possibility;
Pressure-less flowing LN2, without spilling, noise, vibrations, etc.

Technical Specifications

Static evaporation rate	< 0,5 liters per day
Flow rate	adjustable from 0.01mBar to 270 mBar (by potmeter on pump) == from dripping up to 0.5 Liter/minute (with a fill line of 2 meter and 4 mm ID)
Maximum working pressure	< 300 mBar
Reaction time	+/- 2 minutes for cooling down the fill line (with 2 meters fill line)
Power connection	115V / 230V AC with supplied power supply or 12-24 Volt AC/DC
Power consumption	average 5 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 2.00 m, phase separator, power supply, cables, 2 level sensors, PC software.
Working modes	#905, working mode 1 to 7 for level control #910, working mode 1 to D including temperature control #915, working mode 1 to F including full RS232 control
External control	#905, 5 volt signals for ON, OFF and RS232 signals for ON, OFF #910 and #915, more signals to control, depending on mode
PC software	Monitor software, to monitor pump behavior, and for some working modes to adjust some parameters
Alarms/warning acoustical/ visual / mechanical	Dewar empty, Dewar 5 liters LN2 left, broken sensor(s), frozen alarm, mechanical overpressure protection valve
Options	Transport trolley 5 wheels (10 cm height) Stand for pump (when Dewar is refilled) Custom built adaptor to fixate sensor(s) on application

All #900 models look the same from the outside and can be internally set in different working modes for the application. All models can be connected to a PC in order to display the status of the system. The software + hardware needed to do this is included with each pump.

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