Solid Particles
Laser particle counter analysis classifying particle size counts down to 0.1 – 0.5 µm, 0.5 – 1.0 µm, and 1.0 – 5.0 µm.
ISO 8573 Purity Compliance & Validation
Compressed Air Quality Testing
& Purity Audits
Protect product quality, avoid batch contamination, and pass quality audits. Fisher Installations delivers calibrated ISO 8573 testing for particles, dew point moisture, oil vapor, and bacteria.
ISO 8573Global air purity standard
-40°CtdPressure dew point testing
100%Audit-ready certificates
Accredited testing parameters
Four key compressed air purity parameters we measure
Where compressed air contacts food, pharmaceuticals, or delicate components, unmonitored contaminants cause corrosion, bacteria growth, and audit failures.
Pressure Dew Point
Calibrated dew point sensors measure dryness down to -40 °Ctd (desiccant dry) or +3 °Ctd (refrigerated dry).
Oil Aerosols & Vapor
Testing total residual oil concentration (mg/m³) across systems equipped with activated carbon towers or oil-free compressors.
Microbial Contaminants
Sterile air sampling ensuring airlines feeding packaging areas are free from live bacteria, yeasts, and fungal spores.
Regulatory compliance
ISO 8573-1:2010 Purity Class Matrix
| Purity Class | Particle Count (0.1–0.5 µm) | Pressure Dew Point (°Ctd) | Total Oil (mg/m³) |
|---|---|---|---|
| Class 0 | As specified by equipment user / stricter than Class 1 | Stricter than Class 1 | Stricter than Class 1 (< 0.01 mg/m³) |
| Class 1 | ≤ 20,000 / m³ | ≤ -70 °Ctd | ≤ 0.01 mg/m³ |
| Class 2 | ≤ 400,000 / m³ | ≤ -40 °Ctd | ≤ 0.1 mg/m³ |
| Class 3 | Not specified | ≤ -20 °Ctd | ≤ 1.0 mg/m³ |
| Class 4 | Not specified | ≤ +3 °Ctd | ≤ 5.0 mg/m³ |
Air Quality Deliverable
A formal Certificate of Conformance mapping measured solid particles, pressure dew point (°Ctd), and total oil concentration directly against ISO 8573-1:2010 quality class limits.
Frequently asked questions
Air quality testing FAQs
How long does on-site compressed air quality testing take?
On-site sampling typically takes 2 to 4 hours per designated testing point. Results for dew point and particle counts are available immediately, while microbial culture plates undergo lab incubation.
Do I receive a formal Certificate of Analysis?
Yes. You receive an official Fisher Certificate of Conformance mapping measured values directly against ISO 8573-1:2010 quality class thresholds for your quality management audit files.
Validate your compressed air purity