Compressed Air Quality Monitoring According to ISO 8573-1

Compressed air is an important medium in industrial, automated production. This makes it more important to continually improve the quality of compressed air systems for users. ISO 8573 defines the most important impurities in compressed air—particles, water, gases, microbiological content, and oil. CS INSTRUMENTS offers customised solutions for stationary and Portable monitoring. Our products help to reduce the risk of contamination of end products and increase process reliability and the service life of pneumatic components. Contact us today!

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1. Compressed Air Quality Monitoring
According to ISO 8573-1
Compressed Air Quality Monitoring
According to ISO 8573-1
Ensuring purity & reliability in industrial compressed air

2. Importance of Quality in
Compressed Air
Compressed air is an important medium in industrial,
automated production. This makes it more important to
continually improve the quality of compressed air systems for
users. ISO 8573 defines the most important impurities in
compressed air—particles, water, gases, microbiological
content, and oil.
In many cases, lab samples only supply a snapshot and
involve delays. Instead, inline monitoring under real operating
conditions provides continuous insight, enables faster
response to problems, and enhances process reliability.

3. Part 1: Impurities and cleanliness classes
Part 2: Oil aerosol content measurement
Part 3: Humidity/moisture test methods
Part 4: Solid particle content
Part 5: Oil vapour & organic solvents
Part 6: Gaseous pollutants
Part 7: Microbiological contamination
Parts 8 & 9: Mass concentration and liquid water content
ISO 8573 Standard Overview
ISO 8573 is segmented into different parts that address specific contaminants:
Inline continuous measurement focuses on oil aerosols, moisture, and particles.

4. Key Measurement Technologies & Challenges:
Lab sampling yields
average values and time
delays, which are not
ideal for real-time
control.
Online measuring
systems use modern
sensors (e.g., PID sensor
technology) for
continuous, high-precision
oil vapour detection.
Measured values are
continuous, recorded,
and can trigger alarms
when limits are
exceeded.
For particle measurement,
laser particle counters are
commonly used, often
connected via ball valves or
quick couplers for steady
measurements.

5. CS INSTRUMENTS Product Solutions for ISO 8573
Compliance
OIL CHECK 500 Particle Counter PC 400
For permanent, high-accuracy
measurement of vaporous
residual oil (0.001 to several
mg/m³).
Measures particles from 0.1
µm for ISO 8573 class 1
monitoring.
Dew Point Sensor FA 510
Monitors pressure dew point
down to –80°Ctd; supports
continuous alerting if dryer
fails.
DS 500 Chart Recorder
Acts as the central hub;
measures and logs residual
oil, particles, and moisture;
supports up to 12 sensor
inputs and alarm functions.
We recommend the following CS INSTRUMENTS products to monitor and ensure compressed air quality:

6. Benefits of ISO-Based Monitoring
& Why It Matters
Real-time detection of quality deviation reduces the risk of
contamination or process failures.
Alarms help trigger timely maintenance on dryers, filters, and
systems to prevent damage.
Continuous inline measurement offers greater visibility than
intermittent lab sampling.
Ensures compliance with industry standards, protecting product
integrity and equipment.

7. GET STARTED TODAY!
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YOU!www.cs-instruments.com/za