Open concentrate chamber
Internal supports were removed to create a fully open concentrate chamber.
Configuration overview
O–CMF–50mL–34deg
Orthogonal centrifugal membrane filter cartridge for fixed-angle centrifuge rotors designed around standard high-speed 50 mL round-bottom polycarbonate tubes.
| Nominal feed volume | 13.0 mL |
| Operating fill range | 11–13 mL |
| Concentrate chamber volume | 4.6 mL |
| Membrane coupon diameter | 20 mm |
| Effective membrane area | 1.45 cm² |
| Membrane offset, δm | 0.0318 m |
| Free-surface intercept, δs* | 3.71 × 10−3 m |
| Free-surface slope, α | 1.60 × 10−3 m mL−1 |
Cross-section
Cartridge geometry
Cross-sectional reference showing the radial coordinates used in the centrifugal pressure model.
Design features
Improved capacity
The revised cartridge increases concentrate chamber volume to 4.6 mL.
Improved membrane area
The effective membrane area is increased to 1.45 cm², with sealing provided by a compressed elastomeric O-ring.
JA-20 rotor reference
For the Beckman Coulter JA-20 fixed-angle rotor, the geometric reference values are rmax = 0.108 m and rm = 0.0762 m.
| Target pressure (bar) | 13 mL | 12 mL | 11 mL |
|---|---|---|---|
| 2 | 3390 rpm | 3470 rpm | 3560 rpm |
| 5 | 5360 rpm | 5490 rpm | 5640 rpm |
| 10 | 7580 rpm | 7770 rpm | 7990 rpm |
| 15 | 9280 rpm | 9510 rpm | 9780 rpm |
| 20 | 10,700 rpm | 11,000 rpm | 11,300 rpm |
| 30 | 13,100 rpm | 13,500 rpm | 13,900 rpm |
| 40 | 15,100 rpm | 15,600 rpm | 16,000 rpm |
| 50 | 16,900 rpm | 17,400 rpm | 17,900 rpm |
| 60 | 18,600 rpm | 19,100 rpm | 19,600 rpm |
Compact JA-20 free-surface correlation: rs(V) = 7.13 − 0.16 V, valid for V ∈ [11, 13] mL.
Research use statement: CentrivaLab products are intended for research and process development use only and are not intended for clinical or diagnostic use.