Detects particulate-matter surface area through diffusion charging
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 PAS 2000CE --- the DC 2000CE measures ALL particulate matter, the PAS 2000CE measures PAH (primarily on carbonaeous matter)

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Measuring Principle

The Diffusion Charger works on the principle of electrical charging of particles:

Using a corona discharge all particles are charged
A sensitive electrometer is used to measure the current.
Since the charge attachment is a surface phenomena, the measured current is related to the particle surface area ("Fuch's surface area")

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Calibration

The calibration of the compact Diffusion Charger can be done by simultaneous measurements with other particle-measuring instruments (e.g. the SMPS). The calibration is site-specific.

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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 1000 fAmp (conversion to particle-surface area is site-specific)
Sensitivity	~ 10 fAmp (actual calibration is site-specific)
Lower Threshold	~ 10 fAmp
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).

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