NORHOF LN2 FTIR detector filling system model #608
Universal automatic filling system for FTIR detectors as from Bruker or Shimadzu.
Plug and play refilling system, to refill the detector at a presetted time interval.
Usable for overnight measurements
Possible to steer extra filling, so that an automatic fill action can not disturb your automatic measurements
 picture shows #608 pump mounted on a 35 Liter dewar, possible dewars are 25, 35 or 50 Liter pump can be used on other type dewars as long as the dewar has a NW50 flange (new window)
total system height 79 cm |
 adaptor for Bruker Vertex 70-80
adaptor for Shimadzu AIM8800
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Norhof manufactures cooling systems in which Liquid Nitrogen (LN2) is used as the cooling medium. LN2 is supplied without any pressure and filling an application is like a teapot filling a teacup.
You may compare our liquid nitrogen dispenser system with a water tap , but instead of giving water, it gives LN2, starting with some drops, up to 1 Liter/minute.
Liquid Nitrogen (LN2)
The reservoir dewar can safely stand next to your working place, ready for use.
The pump is adjusted with a certain time interval, some shorter than the hold-time of your detector. After this interval time is past, the detector is careful slowly refilled.
Refilling is done with a very gentle steady flow. After the detector is full, the pump stops, and will start again after this time interval, or when an other signal is sent to the pump.
In this way you are sure that your detector is always cold.
The system comes with PCsoftware to read out all what is happening, and to preset the time interval for your detector.
Pump can be steered ON and OFF by 5 Volt signals, or by RS232 commands.
Standard we have adaptors to fit on the Bruker detectors, and Shimadzu AIM8800, but also for other detectors we have adaptors available.
Detailed working is the same as mode 3 for the #905 pump ( see the example for filling small detectors ) , but with this pump an extra delay is built-in to prevent the filling to shut off when the sensor is shortly touched by LN2 during splashing on the sensor during filling.
Usage
The majority of this system find use in the field of laboratories, research centers etc. where FTIR measurements are made and where a safe and unattended refill of LN2 is required.Use of this system is for example for:
* For automatic filling of other small applications we have the #900 serie of microdosing pumps, see the left column
| 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 40 mBar of overpressure, 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. |
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In the Norhof LN2 cooling systems Liquid Nitrogen is stored in pressure less Dewars. 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.
The advantages are numerous:
• the system is extremely safe
the operator comes not in contact with LN2.
• the system is time saving
any operator can install the system on the detector in just minutes.
• the system can cool the detector just with a press on the start button
this means that the detector is cold 24 hours a day.
• the system delivers LN2 without any pressure
this means without noise, vibration, excessive waste, etc.
• there is no external LN2 valve required
that implies no unnecessary heat input which spoils a lot of LN2
• there is no internal LN2 valve in the pump
LN2 comes out of insulated tubing without making contact to warm metallic parts, so very fast
• there is a very low thermal masse to cool down in the pump
LN2 comes out within 1 minute. Detector is filled in ab. 10 minutesFilling efficiency is better than 90%, due to very less loss for cooling down pump parts.
• there is a very low thermal connection to the ambient temperature
This means that the system is extremely economic in stand-by. Typical usage less than 0,5 Liter / day
• P.E.D. 99/36/EC (Pressure European Directive) for pressurized vessels does not apply for this system
The maximum possible pressure is lower than 300mBar.Therefore this system is allowed to be used inside the lab, near your working place, without danger.
Technical Specifications
Static evaporation rate < 0,5 liters per day Flow rate preset on 35 mBar (adjustable with the supplied software) Maximum working pressure < 300 mBar Reaction time ab. 1 minute for cooling down the fill line, 3-10 minutes for filling. 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 25 Liter (on request) 35 Liter (standard) 50 Liter Outside dimensions (round) 395 480 500 mm Height dimensions 736 643 727 mm Weight (empty,full) 10 / 31 13 / 41,5 17 / 51,5 kg System includes Dewar, pump, fill line 1.60 m, power supply, cables, level sensor, PC software. External steering 5 volt signals for ON, OFF RS232 signals for ON, OFF
PC software Monitor software, to monitor pump behavior, to preset refill time interval, filling height and flow rate. Alarms/warning acoustical/ visual / mechanical Dewar empty, 5 liters left, broken sensor, overpressure protection Options Adaptor with sensor for Bruker detectors Adaptor for Shimadzu AIM8800 or similar
Transport trolley 5 wheels (12 cm height)
Stand for pump (when dewar is refilled)
for more models use links in left column
