Membrane filtration unit
A manifold with filter funnels connected to a vacuum source (or a peristaltic pump for closed canisters) that passes liquid samples through a 0.45 µm membrane so that microorganisms are retained and can be grown and counted.
- Pharmaceutical
- Biotech
- Water testing
- Food & beverage
- Medical devices
Filtration unit calibration procedures
Filtration unit has no instrument calibration of its own in most labs. Its performance is controlled through qualification (below) and the system suitability or acceptance checks of each test that uses it.
Instrument qualification (DQ · IQ · OQ · PQ)
- 01
DQ — Design qualification
Defines open manifold or closed system, number of places, funnel type and suitability for isolators.
- 02
IQ — Installation qualification
Records the manifold, pump, filters and documentation.
- 03
OQ — Operational qualification
Checks vacuum level or pump flow, absence of leaks and alarms where fitted.
- 04
PQ — Performance qualification
Method suitability and negative controls show sterile operation and full recovery of test organisms with the product.
Keep every Filtration unit in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.