The quality of compressed air is directly related to production safety and product yield in semiconductor manufacturing, clean room environmental control, and oil-free air compressor applications. Among them, residual oil content is one of the key indicators for measuring the quality of compressed air - even trace amounts of oil vapor (such as 0.001mg/m ³) may contaminate precision components or cause process defects.The AQ 500M portable multi-channel compressed air quality detector has become a core tool for ensuring the cleanliness of compressed air due to its high accuracy and reliability in measuring residual oil.

　　1、 The core challenge of residual oil measurement and the solution of AQ 500M

The residual oil in compressed air mainly includes liquid oil droplets, suspended oil mist, and gaseous oil vapor (such as hydrocarbons and aromatic agents), and its content must be strictly controlled within the ISO 8573 standard range (such as the requirement of residual oil ≤ 0.01mg/m ³ for level 1). Traditional detection methods rely on offline sampling and laboratory analysis, which have problems such as poor timeliness and complex operation, making it difficult to meet real-time monitoring requirements. The OIL CHECK 500 residual oil measurement module equipped on the AQ 500M achieves direct and rapid detection of gaseous residual oil vapor through innovative "forced pressure change" measurement methods and high-precision PID (photoionization detector) sensors. The measurement range covers 0.001~5mg/m ³, and the detection limit is as low as 0.001 mg/m ³ - this accuracy is sufficient to meet the strict standard of ISO 8573 Level 1 (residual oil ≤ 0.01mg/m ³), and can even monitor higher levels of ultra clean compressed air.

　　2、 Technical advantages: precise, flexible, and intelligent collaboration

　　1. High precision and wide range:OIL CHECK 500 uses PID sensors with high selectivity for hydrocarbons and other oil vapors. Through temperature compensation and pressure calibration algorithms, it ensures stable measurement results under different pressures (3-9 bar) and temperatures (+20 ℃~+50 ℃). Its detection limit of 0.001mg/m ³ can accurately capture trace amounts of residual oil in compressed air, avoiding process risks caused by missed detections.

　　2. Multi scenario adaptation:The AQ 500M supports multiple configurations including portable, fixed, and mobile. The mobile sampling system is equipped with a 2m PTFE hose and an oil-free and grease free quick connector, which can flexibly connect key points such as the compressor outlet and the back end of the activated carbon filter; Modular design allows users to select particle counters (PC 400, detecting 0.1 µ m particles) and residual humidity sensors (DS 400) according to their needs, achieving synchronous detection of multiple parameters such as residual oil, particles, and humidity.

　　3. Intelligent operation and maintenance:The device integrates 4~20mA analog output and Modbus RTU digital interface, supporting the generation of visual reports through CS basic version analysis software (USB/Ethernet data reading); The sensor unit supports quick on-site replacement and verifies performance through built-in functional testing buttons, reducing downtime.

　　3、 Application value: Ensuring air quality in key areas

In semiconductor manufacturing, AQ 500M can monitor the residual oil level of compressed air used in lithography machines, etching machines and other equipment in real time, avoiding chip short circuits or yield decreases caused by oil pollution; In a clean room environment, its precise detection ensures that the air cleanliness of the air supply system meets ISO standards, protecting precision instruments from oil mist erosion; In the operation and maintenance of oil-free air compressors, the residual oil content at the back end of the activated carbon filter is regularly checked to verify the filtration efficiency and replace consumables in a timely manner, reducing maintenance costs.

AQ 500M detects residual oil in compressed air quality measurement, with its technical characteristics of "high precision, multi scenario, and intelligence", becoming the "gatekeeper" for residual oil control in compressed air systems, providing solid guarantees for the safe operation of advanced manufacturing and clean processes.