Polymerase Chain Reaction Cabinets
1.3.2.2
Particle Count Test
Use a particle counter with sampling rate of 0.028 m
3
(1 ft.
3
) of air per minute. Put the particle counter
sampling cone inside the work zone, following the grid below:
Distance from walls = a (mm) (in)
Distance apart = x (mm) (in)
Distance from walls = b (mm) (in)
Distance apart = y (mm) (in)
Average Count: for particle size of 0.5 micron and larger sampled in 0.028
m
3
of air
Cleanliness rating: ISO Class 3 as per ISO 14644.1 (≤ 35 count for particles equal to and larger
than 0.5 µm per 1 m
3
or 35.3 ft
3
of air).
Results: Pass / Fail
Note: The particle count done in the factory is “as-built” condition. If 0.5 micron
counter is used on the field, there shall be no more than 35 particles of 0.5 μm
sampled in 1 m
3
(35.3 ft
3
) of air to reach ISO Class 3.
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