-Particle count test is performed to measure the available
particle count in designated area.
-An optical particle
counter shall be used for drawing air sample, which passes through a light
scattering device.
-The generated signal is electronically
processed to display particle counts of different size ranges.
-Particle size range 0.3µ,
0.5µ, 1.0µ, 3.0µ, 5.0µ, 10.0µ. Reading shall be taken for 0.5 µ and 5.0 µ
particle sizes.
-Following are the Acceptance
criteria for air borne particle count as per ISO guideline.
ISO Classification
Number (N)
|
Maximum Concentration Limits (particles/m3
of air) for Non- Viable particles
|
|
0.5 µm
|
5 µm
|
|
ISO Class 5
|
3,520
|
29
|
ISO Class 6
|
35,200
|
293
|
ISO Class 7
|
3,52,000
|
2,930
|
ISO Class 8
|
35,20,000
|
29,300
|
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