DESCRIPTION

Cold trap type GKF

Applications

Construction Details

two condensation walls, cooled by liquid nitrogen ( LN2 )
integrated Dewar flask
viewing stripes for observation of the condensation process
condensate outlet with O - ring sealing
protecting cover made of aluminium
coolant capacity : ca. 1100 ml
condensate capacity : ca. 250 ml

joints:
to pump : ground cone NS 29
to plant : socket NS 29

Advantages

made of Borosilicatglass 3.3
good chemical resistance
good thermal resistance
deliverable:
Type GKF :
aluminium foot (Standard)
all around protection
with special joints
e.g. - small flange KF NW16 / KF NW 25
glass screwthread with olive
DN flange 15-25
Type GKS: incl.4-foot base (special design)

Cold traps / cold fingers

Hence different materials may be present in the gas stream (e.g., water/solvent/acid or alkali containing gases), the condensation temperature of the material to be condensed must be considered first. Having a cold trap, the material made off (glass or metal) and the geometry of the cold trap play an important role regarding the performance of the cold trap. In order to increase the performance of cold traps, these are sometimes provided with integrated baffles, so that the gas is more swirled in the condensation space and thus better condensation can take place on the cold inner wall of the cold trap.

In general, it should be noted that the liquid used for cooling (LN2 or CO2) should be at least 50 ° C colder than the condensation temperature of the substance that you want to condensate out of the gas stream. If you would like to filter e.g. a solvent such as methanol (melting point -98 ° C) or acetone (melting point -95 ° C) out of a gas stream, you will need LN2 (about -196 ° C) as a coolant to achieve sufficient cooling capacity in the cold trap. For water, the melting point is 0 ° C which means that a mixture of CO2 and acetone (about -77 ° C) would be sufficient for water vapor.

In order to obtain a constant performance of a cold trap / cold finger, the coolant level (LN2) inside the Dewar flask also must be kept constantly on a high level. This can be achieved with automatic LN2 level control. By such an automatic LN2 level controller, the cold trap / cold finger is always supplied with sufficient LN2 coolant, so that an optimal condensation performance of the cold trap / cold finger is guaranteed. For this purpose, complete LN2 level control systems for cold traps are offered.

SPECIFICATIONS

Article Numbers

 

Type	Connection	Article No.
GKF	NS29/32	1702
GKF - NW16	KF NW16	1702-NW16
GKF - NW25	KF NW25	1702-NW25
GKF - GL18	GL18	1702-GL18
GKF - GL25	GL25	1702-GL25
GKF - S29	S29	1702-S29

Spare parts

 

description	Article No.
GL 18 olive	17331
GL 25 olive	17332
Fork clamps for spherical joints S29	17341
Pertinax-screw connection KF 10/16	17315
Pertinax-screw connection KF 20/25	17316
centerring ring KF 10/16	17320
centerring ring KF 20/25	17321
spare part for drain valve	17701
spare part O-ring Viton	17702