KGW Isotherm KF 29 / KFL 29 Complete Cold Traps Manufacturer Datasheet
PDF · Manufacturer document
Seeing 150 mL and 1000 mL in a cold-trap specification is not necessarily a contradiction: they may describe condensate and coolant spaces. Without that distinction, coolant volume can be mistaken for collection capacity.
This article uses the KGW KF 29 / KFL 29 data sheet to explain the capacities and connections for configuration discussions. It does not replace vacuum-system or cryogenic procedures.
What the two capacities describe
| Series in the data sheet | Theoretical condensate volume (mL) | Theoretical coolant volume (mL) |
|---|---|---|
| KF 29 | 150 | 1000 |
| KFL 29 | 250 | 2000 |
Condensate volume describes the collection space; coolant volume describes the Dewar space holding cooling medium. The manufacturer calls these theoretical volumes. They are not safe filling limits, allowed collection volumes per run or operating durations.[1]
Capacity alone also does not prove effective capture of a particular vapour. State the medium, expected condensate quantity, system conditions and operating plan so suitability can be confirmed from applicable documents and manufacturer advice.
Confirm the system connection, not just the suffix
The sheet lists GL 18 threaded / tube connections, NW16 / NW25 flanges and spherical ground joints. Their construction and sealing differ; similar sizes do not mean direct interchangeability.[1]
- Threaded or tubing connections: check connection size, fitting–tube match and seals.
- Flanges: specify nominal size and mating parts, not merely a vacuum connection.
- Ground joints: specify joint form, size and seal; do not treat all ground joints as interchangeable.
The full configuration table distinguishes traps by interface. For an existing system, provide both end connections, medium and conditions, then select the complete trap; do not buy a cold finger first and guess its compatibility.
Confirm cooling method and accessories together
The sheet lists liquid coolants such as liquid nitrogen and solid-coolant arrangements using dry ice with a solvent. Dry-ice use requires the corresponding CO₂ metal basket. The cooling method therefore requires accessory checks, not simply changing the medium in the same vessel.[1]
Check coolant and sample safety compatibility, filling level and replenishment against equipment instructions and local procedures. This article gives no universal cooling-bath recipe and does not generalise a cryogenic condition to all gases or solvents.
Cooling space and vacuum path have different conditions
The sheet distinguishes the pressureless coolant space in the Dewar from pressure conditions in the internal trap path. The internal rating does not make the coolant space a sealable pressure vessel.[1]
Confirm limits for glass, plastic rings and seals separately. A protective casing does not remove glass-component limits. Cryogens, vacuum and potentially reactive substances require appropriate risk assessment and laboratory procedures.
Information for configuration discussions
- Vapour and condensate, and material compatibility requirements.
- Expected condensate and operating plan, not just one capacity number.
- Both system connections, operating conditions and sealing requirements.
- Cooling method, accessories, maintenance and emptying arrangements.
Define the task, connections and materials; distinguish the capacities; then check the complete configuration. Neither a model suffix nor a single volume replaces these conditions.
References
- [1] KGW Isotherm KF 29 / KFL 29 Complete Cold Traps Manufacturer Datasheet, PDF page(s) 1–2 (file page order). View reference resource