The
international standard for the calibration of particle counters has been update
to: “ISO 21501-4:2018 Determination of particle size distribution -- Single
particle light interaction methods -- Part 4: Light scattering airborne
particle counter for clean spaces.”
Instruments
that conform to this document are used for the classification of air
cleanliness in cleanrooms and associated controlled environments in accordance
with ISO 14644‑1 and ISO 14644‑2, as well as the measurement of number and size
distribution of particles in various environments.
The
following parameters are within the scope of this document:
—
size setting error;
—
counting efficiency;
—
size resolution;
—
false count;
—
maximum particle number concentration;
—
sampling flow rate error;
—
sampling time error;
—
response rate;
—
calibration interval;
—
reporting results from test and calibration.
Posted by Dr. Tim Sandle, Pharmaceutical Microbiology
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