Step 5 for Compressed Air Analysis: Measuring Compressed Air Quality according to ISO 8573 Part 2
While ISO 8573-1 goes through Contaminants and purity classes, ISO 8573-2 to 8573-9 covers test method for a range contaminant types:
ISO 8573-2, Compressed air — Part 2: Test methods for oil aerosol content
ISO 8573-3, Compressed air — Part 3: Test methods for measurement of humidity
ISO 8573-4, Compressed air — Part 4: Test methods for solid particle content
ISO 8573-5, Compressed air — Part 5: Test methods for oil vapor and organic solvent content
ISO 8573-6, Compressed air — Part 6: Test methods for gaseous contaminant content
ISO 8573-7, Compressed air — Part 7: Test method for viable microbiological contaminant content
ISO 8573-8, Compressed air — Part 8: Test methods for solid particle content by mass concentration
ISO 8573-9, Compressed air — Part 9: Test methods for liquid water content
Instrumentation for oil aerosol content measurement (ISO 8573-2):
CS Instrument Residual Oil measurement - OIL CHECK 500 utilize a Photo-ionization detector (PID), for a permanent and highly accurate oil vapor measurement. Using the patented Forced-Pressure variation method, a long term stability is achieved with the accuracy up to air quality class 1 for total oil (0.001mg/m3).
The sensors can be easily connected to the compressed air system via a ball valve/ quick coupling, and recorded measure values can be connected to an alarm to be triggered when limit values are exceeded.
Instrumentation for humidity measurement (ISO 8573-3):
ISO 8573-3 outlines 5 methods for humidity measurement: spectroscopic, condensation, chemical, electrical, and psychrometric. The electrical method based on capacitance as they offer the greatest measuring range with good accuracies and repeatability. Similarly, the sensors can be easily connected to the compressed air system via a ball valve/ quick coupling, and recorded measure values can be connected to an alarm to be triggered when limit values are exceeded.
CS Instruments Dew Point Sensor FA 510 is able to measure the pressure dew point continuously up to -80 °Ctd. The dew point sensor have excellent long-term stability, and is insensitive against condensation as well as protected from direct contact against soiled particles. Optional versions included pressure tight up to 350 bar with high pressure measuring chamber as accessories.
Instrumentation for solid particle content (ISO 8573-4):
ISO 8573-4 outlines 5 methods for solid particle content measurement: Laser particle counter, Condensation nucleus counter, Differential mobility analyzer, Scanning mobility particle sizer, Sampling on membrane surface in conjunction with a microscope.
Laser particle counter is the most commonly used test method for measurement and is a optical method in which a photodiode captures the scattered laser light shone on particles, in which the shape and size is determined by the intensity and angle of the scattered light.
CS Instruments Particle Counter PC 400 comes in mobile and stationary versions, and is able to detect up to 0.1 µm, suitable for monitoring ISO 8573 air quality class 1. The particle counter is able to operate at a flow rate of 28.3 L/min, which is higher than most particle counters in the market. Capable of measuring gas types such as N2, O2, CO2 besides compressed air and further gas types on request, a class 1 filter is also included in the particle counter to ensure contamination at the optics can be quickly detected and eliminated.