TSI 3340A Laser Aerosol Spectrometer (LAS)

Descriptions of TSI 3340A

TSI’s Laser Aerosol Spectrometer 3340A is a general purpose aerosol particle sizer which combines ultra-high sensitivity and superior resolution with ease-of-use. This high performance workhorse measures complete size distributions in a tenth of a second over a size range of 0.09 (90 nm) to 7.5 µm easily and accurately. Configurable size channels enable users to zero in on a specific size range or match the resolution of another instrument.

Valuable Addition to Your Aerosol Tool Kit The Laser Aerosol Spectrometer is equally used in industry and research. It can determine the most penetrating particle size (MPPS) of high performance filters and show the particulate emission of e-cigarettes. It can also provide valuable supplemental information to aerosol measurements based on other sizing techniques (i.e. SMPS™, APS™, CPC, FMPS, etc.).

Air Cleaner Testing (CADR Testing) The model 3340A is a standard reference instrument often used in air cleaner testing according to AHAM AC-1-2013 and local standards such as GB/T 18801-2002. Often used in combination with other TSI components such as the Fluidized Bed Aerosol

Features and Benefits

• Ultra-high Sensitivity & Superior Resolution

▪  Dynamic size range: 0.09 to 7.5 µm

▪  Typical resolution within 2.5% of the particle  diameter at 0.1 µm

▪ Wide concentration range: up to 18,000 particles/cm³

• Ease of Use and Flexibility

▪ 100 user configurable particle size channels

▪ User adjustable flow rate

▪ Intuitive LabVIEW based control software

▪ Microsoft Surface Pro tablet with touch screen and keyboard

• State-of-the-Art Optical and Detection System

▪ Patented wide angle optics and intracavity laser

▪ Highly sensitive photodetectors

▪  Automated gain ratio adjustment and laser  reference compensation

Operation

The Laser Aerosol Spectrometer 3340A uses the intensity of light scattered from a laser to measure the particle size. However, the 3340A is not your low precision Optical Particle Counter (OPC) which has gross resolution and bin counting. The Laser Aerosol Spectrometer is truly an optical particle sizer (OPS) featuring sophisticated optics, electronics, and  flow schemes.

▪  Wide Angle Light Scattering: The wide angle light scatter collection resolves the Mie Scatter sizing issues associated with less sophisticated optical instruments. The instrument features

Technical specifications of TSI 3340A

Particle Size Range –0.09 to 7.5 μm

Particle Sizing Accuracy – Within ≤5% of particle diameter at 0.1 microns (typically within ≤2.5%)

Zero Count  – <1 particle counted in 5 minutes (JIS standard)

Counting Efficiency  – >50% at 90 nm

Particle Concentration Range

• 18,000 particles/cm3 at 10 cm3 /min.
• 3,600 particles/cm3 at 50 cm3 /min.
• 1,800 particles/cm3 at 95 cm3 /min.

Number of Channels User-selectable, up to 100

Flow

• Sample Flow Rate User-selectable, 10-95 cm3 /min. ± 5%
• Sheath Flow Rate 650 cm3 /min. ± 5%
• Atmospheric Pressure Correction  – Sample flow automatically corrected by internal flow controller.

Environmental Operating Conditions

• Operating Temperature 10 to 30°C (50 to 86°F)
• Operating Humidity 10 to 90% RH non-condensing
• Operating Altitude Sea level to 4,000 meters (13,000 ft)

Aerosol Medium

Designed for use with air. Do NOT use with pressurized, explosive, corrosive, toxic, or other hazardous gases.

Calibration Particles NIST traceable Polystyrene Latex (PSL) Spheres

Laser Source Helium-Neon (HeNe) gas laser, 633 nm, >1 W intracavity power

Detectors Avalanche Photo Diode (APD) and PIN photodiode

User Interface Control software running on a Microsoft Surface Pro tablet with 12.3 inch touch screen and keyboard

Operating System & Software Windows 10

Control software VI (virtual instrument) based on LabView 2017 generated executable

Communication RS-232 (9-pin D connector) for instrument control with NI serial to USB converter to interface with control computer

Dimensions 56 x 43 x 25 cm (22 x 17 x 10 inches)

Weight 24 kg (53 lbs.)

Power 100-240 VAC; 50/60 Hz; 200 watts required