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Specifications
| Parameter | Description |
| Membrane Size | CF025: 24-25mm CF047: 47-49 mm CF090: 90-92 mm |
| Membrane Active Area | CF025: 4.1cm² (0.64 inch²) CF047: 14.6 cm² (2.26 inch²) CF090: 53 cm² (8.2 inch²) |
| Cell Body Material | 316 Stainless Steel |
| Maximum Pressure | CF025/CF047/CF090: 69 bar (1000 psig) CF047X: 172 bar (2500 PSI) |
| Maximum Temperature | 150°C (302°F) |
| o_rings | Viton* (Other materials available) |
| pH Range | Membrane Dependent |
| Connections | |
| Inlet/Outlet Size (Tube OD) |
3/8” Compression |
| Permeate Size (Tube OD |
¼” Compression |
Applications
- Membrane testing and evaluation
- Biological or biopharmaceutical processing
- Concentration of fruit juices and extracts
- Food and beverage processing
- Desalination of brackish water or seawater
- Purification of rinse water in electroplating tanks
- Municipal or industrial water and wastewater
purification
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Frequently Asked Questions
Q: What is the recommended flow rate for the CF cells?
Please refer to the following diagram to examine recommended feed flow rates for the crossflow cell you are working with.
Q: Why is the flat sheet membrane I'm using measuring a flux value less than the published flux value?
Flow characteristics for a spiral element and flat sheet membrane are significantly different and are really only comparable on a qualitative basis. Variability in the membrane manufacturing process, differences in water composition, test procedures, and test equipment, used in a factory, laboratory, or elsewhere, will impact water flux results.
Reference: Understanding Variation of Experimental Flux and Rejection
Q: What is the recommended flow rate for the CF cells?
lease refer to the following diagram to examine recommended feed flow rates for the crossflow cell you are working with.
Q: What are the available materials of construction for the Sterlitech crossflow test cells?
The Sterlitech bench-scale crossflow test cells are available in a variety of materials to suit most applications:
- Stainless Steel
- PTFE
- HastelloyTM
- Delrin (natural acetal copolymer)
- Acrylic
Addtionally, there are a variety of available o-ring seals including Buna-N, EPDM, Viton, FEP encapsulated Viton, and FFKM (Markez).
Q: Can I reuse flat sheet membranes after they have been removed from a crossflow test cell?
Yes, you may attempt to reuse flat sheet membranes. However, you may find it difficult to achieve a leak free seal. The cell body o-rings necessarily compress the membrane during installation and the physical action of separating the membrane from the o-rings during removal may cause damage. This damage can impede that ability to achieve a leak free seal when the membrane is reused.
Q: How do I install/remove permeate fittings or other plastic NPT fittings?
Sterlitech recommends to install all plastic fittings by hand using PTFE tape. If a plastic NPT or compression fitting starts to leak during operational testing, tighten the fitting carefully until the leaking stops. Excessive tightening may break the fitting or damage other components.
If the fittings is broken and stuck in the cell top, use a spiral flute extractor bit or similar tool to release the portion of the fitting in the cell top. If the cell top becomes cracked from removal efforts, a replacement can be purchased.
Q: What are the differences between the crossflow test cells and the Sterlitech HP4750 stirred cell?
Sterlitech crossflow test cells (Sepa® CF, CF042, and CF016) operate in true crossflow filtration mode, meaning the feed flows tangentially across the membrane and produces both a permeate stream and a concentrate (retentate) stream. These systems allow continuous operation, with user-controlled pressure and crossflow rate, and enable ongoing sampling from both streams during testing.
The HP4750 Stirred Cell, by comparison, is a sealed batch filtration device (up to 300 mL feed volume) typically pressurized with compressed gas. It runs in normal-flow (dead-end) mode and does not have a concentrate stream. A stir bar helps reduce concentration polarization and simulates crossflow-like mixing at the membrane surface, but it is not true crossflow.
