Oil vapor sensor OIL CHECK 500

Presentation
OIL CHECK 500 - monitoring system for measuring vaporous residual oil content in compressed air, nitrogen and other non-aggressive gases. Designed to detect residual oil contamination in compressed-air networks and to provide early warning to avoid damage, production stops or costly cleaning operations.

Function and advantages
The OIL CHECK 500 is a highly sensitive measurement system for continuous monitoring of compressed-air installations. It detects contamination events including transient pulses. The calibrated detection range and equivalences (ppb/ppm and mg/m³) are provided in the product documentation. The device is optimised to monitor continuously between laboratory calibrations, minimising false positives while providing rapid alerts for imminent contaminations.

Application areas
Recommended for processes requiring high compressed-air quality: pharmaceutical, chemical, semiconductor manufacturing, downstream of filtration/drying stages, after activated carbon filters or in oil-free compressor installations (with upstream filtration and drying).

Main operating features

• Very high sensitivity for detection of hydrocarbons and functional/aromatic compounds.
• Extended measurement range suited to early detection of residual oil.
• Digital and analog outputs for control-system integration (RS485 Modbus RTU, Ethernet via DS modules, 4...20 mA).
• Optional alarm inputs/outputs and additional analog outputs.

Practical use
The OIL CHECK 500 is installed in bypass with a low, constant sample flow (approx. 0.5 L/min standard, conditions dependent) and uses a female G 1/4" (ISO 228-1) process connection. It requires a plug-in power supply 100...240 VAC, 50...60 Hz. Operating ambient temperature, compressed-air temperature and acceptable relative humidity are defined in the specifications; operation requires no condensation.

Documentation and files
Datasheet and user manual available in PDF format (technical files linked to the product).

Characteristics / technical specifications

• Model: OIL CHECK 500
• SKU: 06990080
• Brand: CS-Instruments
• Measuring medium: compressed air, nitrogen (other gases on request; no aggressive/corrosive/toxic/flammable/oxidising components).
• Measured quantity: residual oil content in mg oil / Norm m³ (reference: 1.0 bar [abs], +20 °C, 0% RH) according to ISO 8573-1.
• Detectable substances: hydrocarbons, functional hydrocarbons, aromatics.
• Typical installation: downstream of activated-carbon filter/adsorber or after oil-free compressor, with upstream filtration and drying.
• Ambient temperature: +20 °C ... +45 °C, RH ≤ 75% without condensation.
• Compressed-air temperature: +20 °C ... +50 °C.
• Operating overpressure (service): 3 ... 9 bar (optional pressure reducer for connections up to 300 bar).
• Sample gas humidity: ≤ 40% RH, dew point under max. pressure +10 °C (non-condensing humidities).
• Compressed-air connection: female thread G 1/4" (ISO 228-1).
• Reported values: mg/Norm m³, pressure- and temperature-compensated residual oil vapour content.
• Measurement range: 0.001 ... 5 mg/m³ (higher ranges on request).
• Detection limit (residual oil): 0.001 mg/m³.
• Sample gas flow: approx. 0.5 L/min (standard, based on 1.0 bar [abs] and +20 °C, relaxed state).
• Power supply (plug-in): 100...240 VAC / 1 Ph. / PE / 50...60 Hz / ±10%.
• Outputs/communication: Digital: RS485 (Modbus RTU); Ethernet via DS 400/500. Analog: 4...20 mA (galvanically isolated). Options: 2× 4...20 mA, 2× alarm outputs for external alarm column; adjustable alarm thresholds.
• Hour counter: integrated.
• Dimensions (L × H × D): 200 × 130 × 120 mm.
• Weight: approx. 7 kg.