EcoChem Analytics PAH Monitor PAS 2000CE

EcoChem Analytics ... Always the Best That We Can Be

202 Reynolds Avenue
League City, TX 77573, USA
Tel: +281-338-9888 Fax: +281-332-6152
Email: info@ecochem.biz

Detects ultrafine carbon aerosols in real-time

Lightweight, compact and ruggedized construction

Battery powered with onboard data storage

Applications related to personal exposure in various environments (homes, workplace, automobiles, tunnels etc.)

Companion product to the DC 2000CE --- the DC 2000CE measures ALL particulate matter, the PAS 2000CE measures PAH (primarily on carbonaeous matter)

Measuring Principle

The PAS 2000 works on the following principles:

• Using an Excimer lamp the aerosol flow is exposed to UV radiation. The Excimer lamp offers a high intensity, narrowband source of UV radiation. The wavelength of the light is chosen such that only the carbon aerosols are ionized, while gas molecules and non-carbon aerosols remain neutral.
• The carbon aerosol particles emit electrons, which are subsequently removed when an electric field is applied.
• The remaining positively charged particles are collected on a filter inside an electrometer, where the charge is measured. The resulting electric current establishes a signal, which is proportional to the concentration of Elemental Carbon and/ or PAH.

Also by operating the Excimer lamp in a chopped mode, the PAS 2000 can eliminate the background signal, which is associated with freshly generated aerosols. The chopped mode also enables a dynamic zero to be generated automatically by the instrument.

Calibration

Source-specific calibration curves are available or can be generated where the monitor output is compared to an analytically determined EC and PAH concentration. A site-specific calibration curve can provide greater accuracy for the particle size, charge and compound-specific to the source. In addition to the site-specific curves, an approximate universal calibration curve can be used for screening and real-time trending applications.

Technical Specifications

Display

16 characters with 2 lines LED

Power

115 volts AC / 60 Hz & 220 volts AC / 50 HzMax.

Battery 15 volts Lithium Metal Hydride

Range

0 to 4000 ng / m³

Lower Threshold

~ 1 ng / m³

Response time

< 10 seconds (adjustable)

Digital Output

Analog Output

RS - 232 (for data download and program upload)

0 to 10 volts

Sample gas

Built-in pump with flowrate controlled at 1 L/min

Operating temp

40 to 104 ºF (5 to 40ºC)

Dimensions

Height x Width x Depth = 3in x 7in x 5in ( 68mm x 175mm x 124mm )

Weight

3 lb. ( 1.5 kg )

Data Storage

Data Download

8000 data points (each data point consisting of : Time, Value )

User-friendly PC-compatible graphical software used for downloading the collected data. Flat ASCII file output can also be generated for further analysis (e.g. Microsoft Excel format).

Compact Real-Time Photoelectric Aerosol Sensor (PAS 2000CE)

Features

Measuring Principle

Calibration

Technical Specifications