Continuous and highly accurate measurement of oil vapor content in compressed air and gases – ensuring reliable compliance with ISO 8573-1.
| Measuring Range: 0.001 … 5 mg/m³ |
| Detection Limit: 0.001 mg/m³ |
| Standard: ISO 8573-1 (Class 1) |
| Measuring Principle: PID – Photo Ionisation Detector |
| Outputs: 4…20 mA, Modbus RTU |
| Operating Pressure: 3 … 9 bar (optional up to 300 bar) |
| Measuring Range: 0.001 … 5 mg/m³ |
| Detection Limit: 0.001 mg/m³ |
| Standard: ISO 8573-1 (Class 1) |
| Measuring Principle: PID – Photo Ionisation Detector |
| Outputs: 4…20 mA, Modbus RTU |
| Operating Pressure: 3 … 9 bar (optional up to 300 bar) |
| Parameter | OIL CHECK 500 |
|---|---|
| Measured Medium | Compressed air, nitrogen; (free from aggressive, corrosive, acidic, toxic, flammable or oxidizing components). Other gases available upon request. |
| Measurement Unit (Reference Conditions) | mg oil / Nm³, referenced to 1.0 bar (abs), +20 °C, 0 % RH (ISO 8573-1). |
| Detectable Substances | Hydrocarbons, functional hydrocarbons, aromatic hydrocarbons. |
| Recommended Installation / Application | Downstream of an activated carbon filter/adsorber or oil-free compressor; always with suitable filtration and drying equipment installed upstream of the instrument. |
| Measuring Range [mg/m³] | 0.001 ... 5 (higher ranges available upon request) |
| Detection Limit (Oil) [mg/m³] | 0.001 |
| Measured Values | Oil vapor content (temperature and pressure compensated). |
| Operating Pressure [bar] | 3 ... 9 (optionally up to 300 bar using a pressure regulator upstream of the instrument) |
| Measuring Gas Flow [Nl/min] | Approx. 0.5 (referenced to 1.0 bar abs and +20 °C; atmospheric conditions) |
| Measured Gas Humidity | ≤ 40 % RH; pressure dew point max. +10 °C; non-condensing moisture. |
| Ambient Temperature [°C] | +20 ... +45 (RH ≤ 80 % non-condensing) |
| Media Temperature [°C] | +20 ... +45 (short-term up to +70) |
| Compressed Air Connection | G 1/4" female thread according to ISO 228-1 |
| Power Supply | Plug-in power supply 100 ... 240 VAC / 1 Ph / PE / 50 ... 60 Hz / ±10 % |
| Outputs – Digital | RS-485 (Modbus RTU); Ethernet via DS 400 / DS 500 |
| Outputs – Analog | 4...20 mA (electrically isolated) |
| Alarm | 2 alarm relays for external alarm module; freely configurable alarm thresholds. |
| Optional | 2 × 4...20 mA (electrically isolated) |
| Operating Hours Counter | Integrated |
| Dimensions (W × H × D) [mm] | 200 × 130 × 120 |
| Weight [kg] | Approx. 7 |
The OIL CHECK 500 provides continuous, highly accurate measurement of oil vapor content in compressed air, nitrogen and technical gases. Unlike laboratory sampling, it ensures immediate detection of oil breakthrough and complete process control.
With an exceptionally low detection limit of 0.001 mg/m³, the system enables safe and verifiable monitoring of compressed air quality according to ISO 8573-1, including the strictest Class 1 requirements.
The integrated PID (Photo Ionisation Detector) selectively detects hydrocarbons (> C6), while the main components of air remain non-ionized. The measurement is directly proportional to the concentration of oil vapors.
The patented 'Forced Pressure Variation' measuring method automatically compensates for sensor aging and contamination. The result is a long-term stable measurement without the need for activated carbon filters or reference air.
An optional heating element ensures a measuring temperature above 20 °C, enabling correct calculations according to ISO 8573 reference conditions and preventing underestimation of oil vapor content in colder air.
The sensor unit can be replaced directly on site without sending the entire device for calibration. This reduces costs, minimizes downtime and simplifies maintenance.
The device supports a 4...20 mA analog output, Modbus RTU communication and configurable alarm relays, enabling seamless integration into monitoring and SCADA systems.
Suitable for pharmaceutical manufacturing, food processing, electronics, semiconductors and all processes where compressed air or gases come into direct contact with the final product.
In the food industry, compressed air often comes into direct contact with the final product. The OIL CHECK 500 continuously monitors oil vapor content and ensures compliance with strict hygiene and safety requirements.
Pharmaceutical processes require the highest level of compressed air and gas purity. The OIL CHECK 500 provides continuous oil vapor monitoring and rapid detection of deviations that could affect product quality.
In electronics and semiconductor manufacturing, even minimal contamination can result in product defects or rejects. The OIL CHECK 500 ensures reliable real-time monitoring of compressed air quality.
Compressed air is widely used in automotive manufacturing, painting and assembly. The OIL CHECK 500 helps prevent process failures, reduce rejects and improve production reliability.
For all industries where compressed air quality is critical, the OIL CHECK 500 provides continuous oil vapor monitoring, ISO 8573-1 compliance and complete measurement traceability.
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