In 1991, EcoChem pioneered the use of photoelectric aerosol sensors for real-time monitoring of polycyclic aromatic hydrocarbons (PAHs) adsorbed by aerosols. The PAS-2000 particulate matter adsorption polycyclic aromatic hydrocarbon monitor uses an excimer light source to eliminate time delay; Good monochromaticity, high sensitivity, wide measurement range, microprocessor controlled data acquisition and storage, widely used in management, research, and industrial institutions.

The working principle of PAS-2000 is the photoionization of PAH adsorbed by particles. Using an excimer lamp and narrowband UV radiation, when the aerosol stream is exposed to the UV radiation of the excimer lamp, the lamp selectively provides the wavelength of UV radiation. Only the adsorbed PAH aerosol particles are ionized, while gas molecules and carbon free aerosols remain uncharged. Aerosol particles with surface adsorbed PAH molecules will emit electrons in the presence of an electric field, and then positively charged aerosol particles will be measured for charge by an electrostatic meter and collected by a built-in filter membrane. The current signal is proportional to the total PAH concentration adsorbed by particles. When the excimer lamp operates in chopper mode, PAS-2000 can eliminate the influence of background signals (sometimes very close to the combustion source). The signal of the analyzer measures the total PAH adsorbed by carbon particles, which is an uncertain sample.

Real time detection of PAH adsorbed by particles using patented excimer lamp technology

Capable of reacting with ultrafine inhalable particles as carriers of PAH entering the human body

Measure PAHs with 3 or more rings, which mainly adsorb onto particulate matter and cause significant harm to human health

High sensitivity ng/m³

Simple, reliable, shock resistant, and proven technology

Automated operation, no need for manual intervention, with an embedded data collection system capable of up to 2500 data points

Specific dilution sampling system for source monitoring

Outdoor environmental air monitoring: parking lots, traffic intersections, and highway tunnels, etc

Indoor air quality monitoring (home, office, etc.): kerosene heaters, fireplaces, and environmental cigarette smoke

Workplace monitoring of PAH production in industrial environments

Monitoring of carbon aerosols generated under special circumstances: forest fires, burning of used car tires, and monitoring of emissions from agricultural combustion sources

Combustion emissions, refinery heating furnaces, industrial boilers, furnaces, municipal emissions, as well as hazardous and medical waste incinerators

Emissions from diesel and gasoline vehicles

Industrial process emissions: coke oven, petroleum catalytic cracking processing, steel casting, aluminum industry

Power supply: 100~230VAC

Power:<0.4KW 3.4A

Display: LCD display with 128 × 64 pixels

Power supply: 220AC/50Hz, maximum power consumption 35VA

Range: optional, 0~100 μ g/m³EC、0 ~ 100pA、0 ~ 100μg/m³PAH

Sensitivity: 0.3~1 μ g/m³PAH/PA (Special Position Calibration Curve)

Low threshold: 3ng (total adsorbed PAH)

Response time: less than 10 seconds (adjustable)

Signal output: 0~10V, 0~20mA, or 4~20mA

Communication output: RS-232

Sampling flow rate: Built in sampling pump, 2LPM

Operating temperature: 5-40 ℃

Size: Standard desktop unit 133 × 236 × 317mm (H × W × D)

Weight: 9kg

Data storage: 8000 pieces of data (including date, time, and value)

Data collection system: The graphical software interface is user-friendly, allowing for real-time display of result bar charts and calculation of averages.

Data storage: It can be stored in multiple formats and can use electronic spreadsheet programs to output flat ASCII files as the basis for further analysis.

The standard PAS-2000 can also be customized with an environmental sampling system. The heated sampling probe can collect the source gas between 5-300 ℃, equipped with a mass flow controller and a flow restriction hole, and can obtain dilution ratios of 0.05, 0.1, and 0.2.

PAS-2000CE portable carbon aerosol polycyclic aromatic hydrocarbon analyzer

Compact and portable, battery powered, real-time monitoring of particulate matter adhesion PAH, real-time monitoring of ultrafine particulate matter PAH. Can be used for individual exposure monitoring in various environments (home, work, car, tunnel, etc.). The principle is the same as PAS2000, where only particles encapsulated by PAH are ionized.

Technical Specifications

Display: LCD display 16 × 2 characters

Power supply: 220AC/50Hz, 15V battery

Range: 0~1000ng/m³

Sensitivity: 10ng/m³

Low threshold: 10ng (total adsorbed PAH)

Response time: less than 10 seconds (adjustable)

Communication output: RS-232

Sampling gas: Built in sampling pump, flow rate controlled at 1LPM

Operating temperature: 5-40 ℃

Size: 58 × 175 × 124mm (H × W × D)

Weight: 1.5kg

Data storage: 8000 pieces of data

Data download: Use graphic software to download and collect data, which can be stored in multiple formats, and output flat ASCII files as the basis for further analysis (such as EXCEL).

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2.T.H. Gana, P. Hanhelaa, W. Mazureka and R. Gillett. Characteristics of submarine engine diesel particulates in the maritime environment. Journal of Aerosol Science,Volume 41, Issue 1, January 2010, Pages 23-35

3.Elizabeth M. Notha, S. Katharine Hammonda, Gregory S. Bigingb and Ira B. Tager. A spatial-temporal regression model to predict daily outdoor residential PAH concentrations in an epidemiologic study in Fresno, CA. Atmospheric Environment,Volume 45, Issue 14, May 2011, Pages 2394-2403

4.Dane Westerdahla, Scott Fruina, Todd Saxb, Philip M. Finec and Constantinos Sioutas. Mobile platform measurements of ultrafine particles and associated pollutant concentrations on freeways and residential streets in Los Angeles. Atmospheric Environment,Volume 39, Issue 20, June 2005, Pages 3597-3610

5.Megan V. Brachtla, John L. Duranta, Carlos Paez Perezb, Jorge Oviedob , Fernando Semperteguic, Elena N. Naumovad, and Jeffrey K. Griffiths. Spatial and temporal variations and mobile source emissions of polycyclic aromatic hydrocarbons in Quito, Ecuador. Environmental Pollution,Volume 157, Issue 2, February 2009, Pages 528-536