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Oil Check 400

Oil Check 400

Continuous Oil Vapor Measurement in CDA

Compressed air contaminated with oil is a danger for production systems, the environment and also health. Since oil contamination can occur at any point in compressed air processing, the risk should not be underestimated, especially in sensitive production areas of the electronics, chemical, pharmaceutical, food and beverage industries.

The OILCHECK 400 monitoring system continuously controls the compressed air accurately and according to applicable standards for the residual oil vapour concentration and supports you for retaining the compressed air quality. You can therefore fulfil the required standards and gain the trust of your customers with responsible practices.

Key Features

  • Plug & play unit, wall mounted
  • OIL-Check 400 – residual oil content measurement of the vaporous residual oil content from 0.001…2,5 mg/m³, 3…16 bar. Highly precise PID sensor, integrated mini catalyst for zero point calibration
  • Permanent, highly precise residual oil measurement (oil vapor) with PID sensor (photo-ionic-detector)
  • Long-term stable measuring results due to automatic zero-point calibration. The integrated mini catalyst reliably generates a defined reference gas for zero-point calibration
  • Contrary to measuring systems which generate the ”zero air“ resp. reference gas by means of active carbon filters and which are therefore depending on the ageing and the saturation of the active carbon filters, the mini catalyst generates the ”zero air” without ageing or wear. There is no change of active carbon filters necessary
  • Easy sampling via PTFE hose or stainless steel pipe


  • Medical air
  • Pharmaceuticals
  • Food and beverage
  • Semiconductor wafer fabs
  • Conveyance of hygroscopic food
  • High tech processes
Medium Compressed air free of aggressive, corrosive, caustic, toxic, flammable and combustion supporting materials or substances. The use of a compressed air preparation adapted to the measurement task is necessary.
Detectable substances Polyalphaolefines, aromatics, hydrocarbons, aliphatic hydrocarbons and functional hydrocarbons
ApplicationDownstream of activated carbon filter and activated carbon adsorber
Downstream of oil-free compressed air after air dryer
Point of use at production machines
Measured value Residual oil content in mg of oil/normal m3, relative to 1.0 bar, +20°C, 0% relative humidity, according to ISO 8573-1
Sensor TechnologyPID (Photo-Ionization Detector)
Measuring range<0.001 - 2.500 mg/m3
Updating the measuring value display Every 4 seconds
Measuring gas humidity ≤ 40 % relative humidity, PDP maximum +10°C non-condensing humidity
Ambient working temperature+5°C ... +45°C, relative humidity ≤ 75% without dew point
Measuring gas temperature +5°C ... +50°C
Operating overpressure 3 ... 16 bar(g)
Sampling air connection6mm tubing
Measuring gas humidity ≤ 40% relative humidity, max. pressure dew point +10°C, non-condensing humidity
Compressed air connection G 1/8” female thread according to ISO 228-1
Application for measuring probe Optional application
Measuring gas flow rate Approx. 1.20 Standard litre / minute relative to 1.0 bar absolute and +20°C, in depressurised status
Display for adhering to an ISO residual oil vapour class as LED (red/green)
Reference gas generation Integrated catalytic converter
Power supply 100-240 VAC / 1Ph. / PE / 50-60 Hz / ± 10%
Protection class IP54 / DIN EN 60529
Outputs / Interface4 ... 20 mA analogue output
Optional: RS-485, MODBUS RTU
Dimensions 410 x 462 x 163 mm (W x H x D)
Weight approx. 16.3 kg
  1. Gas inlet with integrated pressure limiter set for Oil Check operating conditions
  2. Valve for interchanging between current compressed air sample and reference gas from purifier
  3. Measuring cells monitored with temperature and pressure sensors
  4. Photo-ionisation detector PID (UV lamp and detector)
  5. Gas outlet with silencer

The reduced compressed air via a pressure reducer 1 to the working pressure of the OILCHECK 400 is divided into two partial flows. One part flows directly in the direction of the measuring cell. The other part flows into the heated purifier in which all hydrocarbons are subjected to a catalytic cracking process which converts into water (H2O) and carbon dioxide (CO2).

The air which is now purified of hydrocarbons is now available as the zero-air or reference air for the measuring cell 3. The measuring chamber is therefore cleaned from possible, adhering hydrocarbons and the PID measures the zero-air as constant reference value. The valve 2 enables both partial flows to enter the measuring chamber alternatively. Sensors monitor the pressure and temperature here 3. The highly-sensitive photo-ionisation detector (PID) 4 subsequently evaluates the respective oil vapour content. The measured air subsequently exits the measuring chamber via a nozzle with a silencer 5 into the ambient air. The compressed air through flow via the purifier and the measuring chamber is 1...2 standard litre (1 bar, 20 °C).

Why Oil Vapor Measurement?

Oil – Atmospheric air typically contains between 0.05 mg/m3 and 0.5mg/m3 of oil vapor. Common sources are vehicle or motor exhaust and industrial processes. Even when basically oil-free compressed air is generated, oil can get into the compressed air system.

Possible sources of contamination are:

  • Environment and ambient air
  • Valves and fittings
  • Pipes

Oil can occur in the compressed air system not only in liquid form but also as aerosol or in an even finer form as oil vapour. For this reason, OILCHECK is the safeguard solutions to keep monitor residual oil content in compressed air permanently for demanding applications.

Product Information

OILCHECK 400 Data Sheet