Operation Manual TCH Pro 202 & 203
III. CALIBRATION
PROCESS
Flow calibration is performed with a low back pressure - displaced volume - calibration-
grade flow meter. Particle size calibration is performed in four stages with NIST-traceable
mono-size polystyrene spheres.
•
Stage 1, wet aerosol. Particles smaller than 2µm are diluted in UDI water and atomized.
The mist containing particles is dried, static charges are neutralized and the dry aerosol is
sampled by the Particle Analyzer.
•
Stage 2, dry particles. Particles between 2µm and 10µm are stored dry and fed directly
into the Particle Analyzer.
•
Stage 3, peak location determination and loading of calibration values.
•
Stage 4, reference comparison. Calibrated device results are compared against a
reference unit to determine counting efficiency.
The APA Pro 202 and 203 are calibrated with 7 different traceable particle sizes:
•
Liquid solution (atomized and dried): 0.2µm, 0.3µm, 0.5µm, 1.0µm and 2.0µm
•
Dry: 3.0µm and 10.0µm
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TCH Pro v1.2.1
