SMPS+C Condensation Nucleus Counter, Model #5.400
with Classifier “Vienna” Type DMA, Model #5.500 and
Portable Aerosol Spectrometer, Model #1.108/1.109

Gravimetric measurements have shown that the entire part of the mass of fine dust below 0.5 µm makes up less than 1%. But if the particles are counted, 80% below the size range of 0.5µm. It is not obvious if the particle number or the particle mass has a greater effect on the human health. Therefore it would be useful to have a device which is able to measure particles over a wide size range.

GRIMM has developed a new measuring system consisting of two particle counters and sizers: the GRIMM #5.400 SMPS+C and the GRIMM #1.108 or #1.109 portable aerosol spectrometers.   With this system of the combination of two particle counters it is possible to measure the particle size distribution over a very wide range. The coarse particles (> 0.5 µm), which determine the total mass of aerosol particles, are counted as well as the smaller particles (< 0.5 µm), which determine the total number of the aerosol particles. So this system is mobile and suitable for testing the aerosol quality under all conditions.

The GRIMM SMPS+C system consists of a high resolution CPC #5.403 attached to the GRIMM “Vienna Type” M-DMA (Electrostatic Classifier). Both components together measure in the ultra fine size range from 5 to 350nm the size selective number concentration.

The #1.108/1.109 portable aerosol spectrometer takes a defined air sample by a volumetrically controlled pump and measures the airborne particles continuously by scattered light in its laser measuring cell (OPC - optical particle counter). The measuring range of particle sizes are from 0.3 >20µm in 15 channel sizes (#1.108) or 0.25 > 30µm in 31 channel sizes (#1.109).

Both principles are combined via software to one unit in the WRAS (Wide Range Aerosol Spectrometer) system. The complete WRAS system covers the range from 0.005 to 20/30µm.
 

Measurement Principle

The Portable Aerosol Spectrometer:   It provides single particle count and size classification in real time. The sample air with various size particles is drawn constantly through the flat light beam produced by a focused laser diode. Each scattered signal from a single particle is detected by 90 degree by a high-speed photo diode so particle color changes can be ignored. Each signal is then counted and classified in 15/31 different size channels by an integrated pulse height analyzer. These counts can be displayed at one second, six second or sixty second intervals on an attached computer via RS 232 data transfer.

DMA: A clean volume of controlled air enters the air inlet which ensures a clean air flow around the high voltage rod. The sample air  passes an impactor and neutralizer.  It enters the sample air inlet at the outer wall. When voltage is supplied to the rod the particles are separated according to their electrical mobility. Only particles with the appropriate charge and size travel to the inner rod and into the sample air outlet, entering the Condensation Particle Counter (CPC) as mono-disperse aerosols.

CPC: The aerosols enter via the sampling tube to the Saturator, where they cross a heated (35°C) N Butyl alcohol saturation pipe. There the aerosols are exposed to the alcohol vapor. Particles and vapor then flow into the cooling condenser unit (10°C) where the supersaturated vapor condenses on all the particles as they pass through. This process increases the particle size. These droplets then cross a laser beam of light optic where each droplet scatters light onto a photodiode. These signals are continuously counted and are displayed in particles/cm³ each second on the LCD. These counts are then stored as data and also transmitted via the RS-232 to an external data acquisition device.

Condensed Particle Counter (CPC )

• All-in-one real-time counter from 5 nanometers and higher

• Able to count up to 10 particles/ccm

• Data display in counts/ccm, with background illumination

• Data stored on removable data storage card

• Data updated and displayed every second on the LCD

• Direct computer access via RS-232 port

• 4 LED instrument condition with 3 color status modes

• Integrated N-butyl alcohol bottle with liquid level

• Indication and fill/drain port

• Integrated odor removal absorber air filter

• Port for 3 optional analogue climatic (or gas) sensors

• Portable, battery operated

• Integrated flow and temperature control system

• Integrated lead battery and charger for 5 h (#5.403 only)

• Various power supplies 110/220 VAC, 50 or 60 Hz

Classifier (DMA)

• Port for attachment of one classifier with up to 255 different channel sizes for size distribution analysis)

• Classifiers attached (S-DMA, M-DMA, L-DMA) are automatically identified and controlled

• Powerful 32-bit Windows ™ data acquisition program

• Can make a complete ”fast scan” from 5 to 350 nm in less than 60 seconds

Aerosol Spectormeter (Model 1.108 or Model 1.109)

Contact  

(United States)
GRIMM Technologies, Inc.
PO Box 6358 · Douglasville, GA  30154
1/877-474-6872 (toll-free) · 770/577-0853
770/577-0955 (fax)

GSA Contract: GS-07F-9439S
CAGE: 1ZJP9
 

(Canada)
Grimm Aerosol Canada Inc.
Gil Cossette, P. Eng.
1/877-474-6602 (toll-free)  -  514/928-1715
514-907-5978 (fax)
Email: gilcossette@grimm-aerosol.ca

(Mexico, Central America, South America)

Mauricio Torres

Fraccionamiento Los Candiles
Querétaro, QRO 76190 México
Tel. y Fax. (52) 442 228 2625 y 442 135 00 02
Web:  http://www.comercialaralco.com

Email:  mtorres@comercialaralco.com

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