Cold Trap 9000



Cold Trap 9000

Lowest liquid nitrogen consumption, Easy to install on any Gas Chromatograph



Cryogenic Trapping - trap your analytes of interest - at temperatures below -180 C

Gas chromatography (GC) involves the analysis of volatile organic compounds, that is, material that exist in the vapour phase, at least at the typical GC operationg temperatures between 40 and 300C. Since Aroma compounds must, by their very nature, leave the food matrix and travel through the air to be perceived, they are generally exellent candidates for analysis by GC. Although many of these compounds may be solvent extracted, distilled, or otherwise isolated from the food matrix, it is frequently preferable to take advantage of their volatility and rely instead on techniques of headspace analysis.
Headspace sampling techniques are frequently divided into three broad categories: static headspace, dynamic headspace and purge and trap. In each case, however, the fundamental principle is the same - volatile analytes from a solid or liquid material are sampled by investigating of the atmosphere adjacent to the sample, leaving the actual sample material behind.
Analytes sampled by a headspace technique may be trapped using sorbents like Tenax, Graphitized Carbons or Polymers. However trapping by using a cryogenic trap has a lot of advantages. For trace-level applications the presence of background peaks from the sorbent may be a problem. This is accentuated in the analysis of heavier organics, since they require a higher desorption temperature to transfer from the trap to the gas chromatograph. Frequently the desorption parameters become a compromise between temperatures high enough to desorb the analytes efficiently but low enough to minimize artifacts. One solution is to eliminate the sorbent altogether and collect the analytes cryogenically.

 


Cold Trap 9000 schematics
Cold Trap 9000 schematics

Principle of operation

The main disadvantages of existing Cold Traps on the market is the fact that pressuized systems need special solenoid valves capable of functioning at -180C and due to the pressurised System they need a lot of liquid nitrogen.
The Cold Trap 9000 is designed in a way that no special solenoid valve is necessary and due to the fact that a Vacuum system is used the consumption of liquid nitrogen is very low (about 200 ml/run).
The Cold Trap 9000 uses a vacuum pump based on a multi stage ejector using a carrier fluid like pressurized air which allows a simple and  precise adjustement of the refrigeration fluid.
The heating of the Cold Trap 9000 is performed by giving a direct current to a small tube which allows the system to be heated up from -150C up to 300C in less then 20 seconds, which results in a heating rate of >1350C / minute.


Technical description

The Cold Trap 9000 may be cooled down between 1 minute 30 seconds (GC Oven at 50C) and 4 Minutes (GC Oven at
200C). The speed in cooling down the Cold Trap 9000 is therefore related to the GC Oven Temperature. Heating up the Cold
Trap from -150C up to 300C may be performed in less then 20 seconds, which finally results in a heat up rate >1350C which
is fairely higher then any other Cold Trap available on the market.


Cold Trap inside the GC oven
Cold Trap inside the GC oven

The Cold Trap 9000 consits of a small cooling/heating chamber which has a outer diameter of 12 mm and a length of 120 mm. The trap may be mounted on any position in the GC oven (or outside the oven).
In the center of the Cold Trap 9000 chamber there is a small stainless steel tube which lets pass trough the Caplillary column up to megabore (ID 0,53 mm) can be used. This stainless steel tube is directly connected to a 3 Volt DC Current to provide the rapid heating of >1350C/min.

 



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