KGW Isotherm 21–24 Spherical Dewar Vessels Manufacturer Datasheet
Original English manufacturer datasheet covering the corresponding model specifications, construction and configuration.
View resource →Product overview
21–24 AL spherical glass Dewars provide approximately 1, 3, 5 and 10 L for liquid-nitrogen storage and transport. AL identifies the brushed aluminium casing; A identifies a replacement insert without casing.
Key features
- Borosilicate glass 3.3 inserts with high insulating capacity.
- Spherical reservoirs and narrow openings vary in diameter and height by type.
- AL casings use brushed aluminium; replacement A inserts have separate order numbers.
- Fully silvered as standard; unsilvered, viewing-stripe and shortened versions are available.
- LN₂ holding time is expressed in days, unlike the hourly values used in other cylindrical series.
Construction and dimension illustrations
Technical specifications and models
Dimensional specifications
| Type | max. Contents approx. [L] | A [mm] | B [mm] | C [mm] | D [mm] | H [mm] | B1 [mm] | C1 [mm] | H1 [mm] | E1 [mm] |
|---|---|---|---|---|---|---|---|---|---|---|
| 21 AL | 1 | 30 | 50 | 165 | 235 | 70 | 60 | 175 | 150 | 300 |
| 22 AL | 3 | 60 | 85 | 205 | 305 | 110 | 105 | 225 | 210 | 380 |
| 23 AL | 5 | 60 | 85 | 250 | 350 | 110 | 105 | 260 | 275 | 450 |
| 24 AL | 10 | 65 | 95 | 310 | 380 | 85 | 105 | 330 | 310 | 480 |
Capacity and cryogenic performance
| Type | max. Contents approx. [L] | Weight approx. [kg] | Service life LN2 approx. [d] | Evaporation rate LN2 approx. [L/d] |
|---|---|---|---|---|
| 21 AL | 1 | 1.6 | 5 | 0.2 |
| 22 AL | 3 | 3.1 | 7 | 0.4 |
| 23 AL | 5 | 4.4 | 12 | 0.4 |
| 24 AL | 10 | 6.6 | 16 | 0.6 |
Models and article numbers
| Type | Article no. | Replacement glass | Article no. |
|---|---|---|---|
| 21 AL | 1291 | 21 A | 1271 |
| 22 AL | 1292 | 22 A | 1272 |
| 23 AL | 1293 | 23 A | 1273 |
| 24 AL | 1294 | 24 A | 1274 |
Applications
Liquid-nitrogen storage and transport.
Selection guidance
Check neck opening, complete-vessel and insert dimensions, holding time and evaporation rate alongside capacity. Match 21 A–24 A inserts to the complete-vessel type.