The Ki-Discus Test

Defined in the European Standard for microbiological safety cabinets, EN12469:2000 as a test method for validating the operator/aperture protection performance of microbiological safety cabinets.

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Suitable for testing class I, class II and hybrid cabinets, as well as for cross contamination applications.

Suitable for all open-fronted Cabinets

Operator protection factor can be determined rapidly by viewing the treated filter membranes.

Rapid Accurate Results

Developed to carry out testing in accordance with BS EN12469:2000

Industry Approved Technology

A fine mist of potassium iodide droplets, produced by a spinning disk, is used as a challenge aerosol to measure the containment of a cabinet or fume cupboard. Centripetal collectors sample the air outside or inside the cabinet – depending on the nature of the test. The collectors deposit any potassium iodide particles that are in the sampled air on to filter membranes. At the end of the sampling period the filter membranes are placed into a solution of palladium chloride whereupon the potassium iodide “develops” to form clearly visible and easily identified brown dots.

A knowledge of the number of droplets in the challenge produced by the spray generator and the number collected in the air samplers enables the protection factor for the cabinet to be calculated. All open-fronted microbiological safety cabinets are assessed on this protection factor. 

British and European Standards

The Potassium Iodide test carried out by KI-DISCUS was part of  British Standard BS5726-1992.  This standard became the foundation of the European Standard  BS:EN12469:2000. The test method for the retention efficiency at the front aperature can be seen in Annex C of BSEN-12469:2000.

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