KGW Isotherm KF 29 / KFL 29 Complete Cold Traps Manufacturer Datasheet
Original English manufacturer datasheet covering the corresponding model specifications, construction and configuration.
View resource →Product overview
KF 29/KFL 29 standard complete cold traps combine a glass coldfinger, matching Dewar and plastic support ring to condense moisture, solvents or gases before the vacuum pump. Short KF types have theoretical condensate/coolant volumes of approximately 150/1000 ml; long KFL types approximately 250/2000 ml.
Key features
- Standard one-piece coldfingers for routine vacuum condensation.
- Borosilicate glass 3.3 coldfingers offer high chemical and thermal resistance.
- A bead suspends the coldfinger in the Dewar support ring without a separate stand, allowing easy replacement.
- Cooling uses liquid nitrogen or dry ice; dry ice with solvent requires the matching CO₂ basket.
- Coolant should be at least 50 °C below the condensation temperature of the substance.
- K denotes S29 spherical joints, OK S29 spherical joints with O-ring seals, GL GL18 glass threads with olives, and NW vacuum flanges.
- The Dewar coolant space is pressure-free. The datasheet distinguishes the glass insert range of −196 to +150 °C from the plastic-ring limit of +100 °C.
Construction and model illustrations
Technical specifications and models
KF 29 short complete cold traps
| Type | Condensate theoretical. Vol. [ml] | Coolant theoretical. Vol. [ml] | With Dewar type | Connection type | Article No. |
|---|---|---|---|---|---|
| KF 29-K | 150 | 1000 | 12C | Spherical ground joint S29 | 1731 |
| KF 29-OK | 150 | 1000 | 12C | Spherical ground joint S29 with O-ring seal | 1735 |
| KF 29-GL | 150 | 1000 | 12C | Glass thread GL18 with olive | 1740 |
| KF 29-NW16 | 150 | 1000 | 12C | Vacuum flange KF-NW 16 | 1731-NW16 |
| KF 29-NW25 | 150 | 1000 | 12C | Vacuum flange KF-NW 25 | 1731-NW25 |
KFL 29 long complete cold traps
| Type | Condensate theoretical. Vol. [ml] | Coolant theoretical. Vol. [ml] | With Dewar type | Connection type | Article No. |
|---|---|---|---|---|---|
| KFL 29-K | 250 | 2000 | 18C | Spherical ground joint S29 | 17360 |
| KFL 29-OK | 250 | 2000 | 18C | Spherical ground joint S29 with O-ring seal | 17361 |
| KFL 29-GL | 250 | 2000 | 18C | Glass thread GL18 with olive | 17362 |
| KFL 29-NW16 | 250 | 2000 | 18C | Vacuum flange KF-NW 16 | 17360-NW16 |
| KFL 29-NW25 | 250 | 2000 | 18C | Vacuum flange KF-NW 25 | 17360-NW25 |
Optional accessories and spare parts
Short-version accessories and spare parts
| Description / type | Order number |
|---|---|
| Cooling finger S 29-K | 1732 |
| Cooling finger S 29-O | 1736 |
| Cooling finger S 29-GL | 1741 |
| Cooling finger S 29-NW16 | 1732-NW16 |
| Cooling finger S 29-NW25 | 1732-NW25 |
| Dewar 12C | 10214 |
| CO2 grid | 17570 |
| Plastic ring | 1733 |
| GL 18 Olive | 17331 |
| Cable clamp S29 | 17341 |
| Pertinax screw connection KF 10/16 | 17315 |
| Pertinax screw connection KF 20/25 | 17316 |
| Centering and O-ring KF 10/16 | 17320 |
| Centering and O-ring KF 20/25 | 17321 |
Long-version accessories and spare parts
| Description / type | Order number |
|---|---|
| SL 29-K | 17365 |
| SL 29-O | 17366 |
| SL 29-GL | 17367 |
| SL 29-NW16 | 17365-NW16 |
| SL 29-NW25 | 17365-NW25 |
| Dewar 18C | 10220 |
| CO2 grid | 17571 |
| Plastic ring | 1733 -L |
| GL 18 Olive | 17331 |
| Cable clamp S29 | 17341 |
| Pertinax screw connection KF 10/16 | 17315 |
| Pertinax screw connection KF 20/25 | 17316 |
| Centering and O-ring KF 10/16 | 17320 |
| Centering and O-ring KF 20/25 | 17321 |
Applications
Gas purification in vacuum systems by condensing moisture, solvents or gases, for laboratory, medical, biotechnology and vacuum applications.
Selection guidance
Choose short KF or long KFL by condensate volume, then K/OK/GL/NW connection. Complete sets are listed separately from coldfingers, rings, CO₂ baskets and connectors; spare parts are not complete sets.