PROCESS

AEROSOL MONITOR

MONITORS HIGH-CONCENTRATION,

MONODISPERSE AEROSOL

The Process Aerosol Monitor 3375 (PAM) measures highconcentration, monodisperse aerosol, like that produced with our Model 3475 Condensation

Monodisperse Aerosol Generator* (CMAG) or other Sinclair-LaMer-type generators. The PAM is a process instrument that monitors aerosols online, measuring particle size and concentration in real time. It validates particle size and concentration and helps confi rm that the CMAG is working properly.

It is also suitable for monitoring an aerosol while making adjustments to the generator’s operating parameters. *Availability is limited in Europe.

Operation

Highly concentrated, monodisperse aerosol fl ows from the exhaust port of the aerosol generator to the PAM’s inlet port.

Inside the measuring volume, the intensity of the laser light on the photodetector is reduced depending on particle size and aerosol concentration. Size and concentration also aff ect the standard deviation measured by the photodetector. Unlike conventional photometers, the PAM has a small, well-defi ned measuring volume. The average number of particles inside depends on the concentration of the aerosol and the size of the measuring volume.

As described by the Poisson distribution, the number of particles N fl uctuates with deviation √N. This fl uctuation can be described by the standard deviation of the transmission. Therefore, measuring the average transmission and its standard deviation in the defi ned measuring volume determines both mean particle size and aerosol concentration. The measurement of the concentration is independent

Features and Benefi ts

+ Measures high-concentration, monodisperse aerosol

+ Provides real-time measurements of particle size and concentration

+ CMAG accessory

Applications

+ Validation of particle size and concentration

+ Monitoring operating parameters of monodisperse

aerosol generators

+ Monitoring an aerosol during the process of adjusting

CMAG operating parameters such as temperature,

saturator fl ow, or screen fl ow

+ Use for general monitoring tasks involving a variety of

high-concentration, monomodal aerosols

UNDERSTANDING, ACCELERATED

SPECIFICATIONS

PROCESS AEROSOL MONITOR

MODEL 3375

Performance

Mode of Operation

Extinction photometer with fluctuation analysis, concentration determined independent of extinction coefficient

Particle Size Range 0.5 to 10 μm

Particle

Concentration Range >10

4 up to 107/cm 3

Aerosol Monodisperse, spherical particles (calibrated for DEHS)

Light Source

Aerosol Flow Rate

Stable, 3-mW, 785-nm laser diode

0.1 to 8 L/min

Sheath Air Flow Rate 0.2 L/min

Maximum Counter-

Pressure

Hardware

3 kPa (0.03 atm)

Dimensions (LWH) 6 cm × 20 cm × 23.5 cm (2.4 in. × 7.9 in. × 9.3 in.)

Weight 2.4 kg (5.3 lb)

Power Supply 115/230 VAC

Bibliography

Altmann J, A Rudolph, and B Wessely, Particle Sizing of Highly Concentrated Monodisperse

Aerosols, J. Aerosol Sci., 25 (suppl. 1): 523-524 (1994).

Gregory J, Turbidity Fluctuations in Flowing Suspensions, J. Colloid and Interface Sci.

105(2): 357 (1985).

TSI and the TSI logo are registered trademarks, and

MacroIMS is a trademark of TSI Incorporated.

TO ORDER

Fluidized Bed Aerosol Generator

Specify Description

3375 Process Aerosol Monitor

Model 3375 is produced in Germany by TOPAS GmbH and marketed by TSI Incorporated. Contact your TSI representative for additional information.

UNDERSTANDING, ACCELERATED

TSI Incorporated - Visit our website www.tsi.com for more information.

USA Tel: +1 800 874 2811

UK Tel: +44 149 4 459200

France Tel: +33 4 91 11 87 64

+49 241 523030

India Tel: +91 80 67877200

China Tel: +86 10 8219 7688

Singapore Tel: +65 6595 6388

P/N 1931236 Rev C ©2014 TSI Incorporated Printed in U.S.A.