COMPRESSED AIR QUALITY MEASUREMENT

Compressed air is contaminated by oil is a danger for production plants, the environment or even for health. "Oil-free" compressors are no guarantee for "oil-free" air because of the ambient air/induction air. In most cases, a certain residual oil content cannot be entirely avoided in standard applications. Precise monitoring of the oil vapour content which is possible at all times is therefore all the more important.

Extract from ISO 8573-1 Compressed Air Quality Threshold Values

ISO 8573-1 : 2010 Solid Particulate Water Oil
Class Maximum number of particles per m3 Vapour Liquid Total Oil
  Pressure Dew Point (Aerosol liquid and Vapour)
  0.1 - 0.5 μm 0.5 - 1 μm 1 - 5 μm oC g/m3 mg/m3
0 As specified by the equipment user or supplier and more stringent than Class 1
1 ≤ 20,000 ≤ 400 ≤ 10 ≤ -70 - 0.01
2 ≤ 400,000 ≤ 6,000 ≤ 100 ≤ -40 - 0.1
3 - ≤ 90,000 ≤ 1,000 ≤ -20 - 1
4 -   ≤ 10,000 ≤ +3 - 5
5 -   ≤ 100,000 ≤ +7 - -
6 -     ≤ +10 - -
7 -       ≤ 0.5 -
8 -       0.5 - 5 -
9 -       5-10 -
X -       >10 >10

Compressed Air Quality Measurement – According to ISO 8573

CS Instruments’s Air Quality Analyser continuously monitors and documents the residual oil content, particles and dew point of the flowing compressed air. Even the smallest amounts of oil, particle and moisture in the compressed air will be detected and reliably determined. Time-intensive sampling and costly laboratory analyses are no longer required. The provided data gives early notice on the possible contamination of pipe work and products. When critical points are reached in the system, you will be able to react immediately to deviations in a proactive manner. The monitoring system thus prevents damage to machines and plant, avoids high repair and reject costs and, not least, damage to products and therefore consumer confidence.

OIL-Check & DS 400

Residual Oil Content Measurement - According to ISO 8573

The OIL-Check continuously monitors and documents the residual oil content of the flowing compressed air. Even the smallest amounts of oil in the compressed air will be detected and reliably determined. Time-intensive sampling and costly laboratory analyses are no longer required. The provided data gives early notice on the possible contamination of pipe work and products. When critical points are reached in the system, you will be able to react immediately to deviations in a proactive manner. The OIL-Check thus prevents damage to machines and plant, avoids high repair and reject costs and, not least, damage to products and therefore consumer confidence.

Product Features
  • Continuous on-line measurement
  • Simple integration into a computer network with state-of-art IT connections
  • Easy data retrieval via intuitive touch screen display
  • TUV certification in accordance with ISO 8573
Technical Data
Medium Compressed air
Noticeable substances Polyalphaolef
insAliphatic hydrocarbon
Hydrocarbons
Functional hydrocarbon
sAromatics 
Ambient temperature +5…+45 °C
Compressed air temperature +5…+55 °C
Operating over pressure 3 bar, max. 16 bar
Power supply 230 VAC 50 Hz 
Measuring gas humidity < 40% rel. humidity
Measuring unit mg/m3
Measuring unit 0.01   – 5,000 mg/m3
Residual oil content (according to ISO 8573-1) 
Measuring accuracy 0.003 mg/m3
Detection limit 0.0006 mg/m3
Connection 3/8” internal thread
Inlet zone 10 x DN (min. 200 mm) / according to ISO 8573-2 
Outlet zone 3 x DN (min. 100 mm) / according to ISO 8573-2 
Dimensions 487 x 170 x 120 mm (W x H x D) 

DS 400 - Display unit for OIL-Check

The universal and multifunction display and compressed air data logger that can measure, display and record all relevant parameters (Flow, consumption, dew point, pressure, temperature, power consumption, compressor status etc.) in a compressed air system.

Technical Data
Sensor inputs  2 / 4 (2x2) sensor inputs for analogue and digital sensors freely allocable. 
Colour screen 3.5“-Touchpanel TFT transmissive, graphics, curves, statistics 
Interface  USB 
Ethernet TCP, RS 485 Modbus RTU, 
SDI (Serial data Interface)
Other bus systems on request, web server optional 
Outputs Outputs 2 relay (max. switching voltage: 230 VAC / 30 VDC, Switching current: min. 10mA, max. 3A) alarm management,
Relay freely programmable, collective alarm. 
Power supply  110…240VAC, 50-6-Hz 
Operating temperature  0 – 50 °C 
Data logger 100 million measured value
Dimensions  Wall mount: 118 x 115 x 98 mm (W x H x D) 
Weight 545 g 
Optionally Data Logger, Memory size 4 GB SD memory card (micro SD class4) 
Optionally Ethernet- and RS 485 Interface (Modbus Protocol) 
Optionally Webserver 

OILCHECK – Mobile

Residual Oil Content Measurement - According to ISO 8573

The residual oil content sensor OILCHECK measures the vaporous residual oil content in the compressed air. By means of a sample taking a representative part volume flow is taken from the compressed air and led to the OIL check. Due to the continuous measurement threshold value exceeding will be recognized immediately and remedial actions initiated.

Mobile solution in combination with PC 400 particle counter + DS 500 mobile

  • OIL-Check residual oil content measurement for vaporous residual oil content (DN 20 - DN 40), 3-16 bar, measuring range < 0.01...5.000 mg/m³, including sampling probe (DN 20 - DN 40), inspection certificate, 4...20 mA analogue output
  • OIL-Check measuring section for sampling (DN 20, 3/4", 16 bar, stainless steel, outer diameter 26.9 mm, outer thread R 3/4") please find further measuring sections at data sheet
  • Ball valve G 3/8" incl. connection fittings for installation between sampling probe and OIL-Check, cleaned oil- and grease-free
  • Connection plug for 4...20 mA analogue output
  • Connection cable for third-party sensors to portable devices, ODU/open ends, 5 m
  • PC 400 particle counter up to 0.1 µm for compressed air and gases, incl. pressure reducer
  • Connection cable 5 m
  • DS 500 mobile - intelligent chart recorder in basic version (4 sensor inputs)
  • CS Soft Basic - data evaluation in graphic and table form - reading out of the measured data via USB or Ethernet
  • Mobile transport case with wheels including mounting plate

Particle Counter PC 400

Stationary solution according to ISO 8573

The highly precise optical particle counter PC 400 measures particles from a size of 0.1 µm and is therefore suitable for monitoring of the compressed air quality class 1 (ISO 8573). The correct function the filtration elements mounted in the compressed air is monitored and possible filter perforations are recognized immediately. The compressed air flow through the particle counter is automatically supervised.
Technical Data
Measuring range Number of particles per m3 Particle size channels:
0.1...0.5 m, 0.5...1 m, 1...5 m
Further particle size chan- nels on request 
Flow rate 28.3 l/min (1 cfm) 
Light source Laser diode
Interface RS 485 (Modbus Protocol)
Power Supply 24 VDC, 300 mA
Dimensions 150 x 200 x 300 mm
Weight 8 kg

Station solution in combination with DS 400

  • PC 400 particle counter up to 0.1 µm for compressed air and gases incl. pressure reducer
  • Connection cable 5 m
  • DS 400 chart recorder with graphic display and touch screen operation
  • Option: Integrated data logger for 100 million measured values
  • Option: Integrated ethernet and RS 485 interface
  • CS Soft Basic - data evaluation in graphic and table form - reading out of the measured data via USB or Ethernet
  • Alternative version to PC 400 up to 0.1 µm: PC 400 paticle counter up to 0.3 µm for compressed air and gases incl. pressure

Particle Counter PC 400 - Mobile

The highly precise optical particle counter PC 400 measures particles from a size of 0.1 µm and is therefore suitable for monitoring of the compressed air quality class 1 (ISO 8573). The correct function the filtration elements mounted in the compressed air is monitored and possible filter perforations are recognized immediately. The compressed air flow through the particle counter is automatically supervised.

Mobile solution in combination with DS 500 mobile

  • PC 400 particle counter up to 0.1 µm for compressed air and gases incl. pressure reducer, in a service case
  • Connection cable for third-party sensors to portable devices, ODU/open ends, 5 m
  • Chart recorder DS 500 mobile, 4 sensor inputs
  • CS Soft Basic - data evaluation in graphic and table form - reading out of the measured data via USB or Ethernet
  • Alternative version to PC 400 up to 0.1 µm: PC 400 particle counter up to 0.3 µm for compressed air and gases incl. pressure reducer