The SMPS+C Scanning Mobility Particle Sizer is a nanoparticle size spectrum analysis system. The laboratory model consists of a detection system consisting of DMA+CCP5416, and the 19 'rack mounted system consists of DMA+CCP5420, used for nanoparticle analysis from 5nm to 1100nm.

GRIMM DMA conforms to the Vienna type design features, with the highest resolution and lowest dispersion loss for small particles. Depending on experimental requirements, there are two electrode lengths available.

DMA (Differential Mobility Analyzer) is used to classify particles, and the nozzle removes coarse particles to reduce interference from large particles; It is also recommended to install an electrostatic neutralizer in advance to eliminate the influence of charges on aerosol particles. The U-shaped design of the top entrance can reduce particle loss; The top laminar flow device makes the airflow flow in a laminar state. The clean and dry sheath gas flows together with the sample gas flow from top to bottom.

The outer sleeve of DMA is grounded, and the central pole is connected to a positive pressure high-voltage generator. Particles with negative charges in the environmental particles will migrate in the electric field between the outer sleeve and the central pole. At a certain voltage (corresponding to a certain electric field strength), negatively charged particles with a certain charge to mass ratio will migrate to the lower slit of DMA and escape, while the remaining charge to mass ratios and their electrically neutral and positively charged particles will be filtered and discharged with the excess airflow. The particles escaping through the slit are monodisperse aerosol particles, which enter the CPC Condensation Particle Counters to count the particles.

Particle size range 5~1094 nm

Concentration range~10⁷P/cm³

Vienna type DMA, L-DMA and M-DMA can be switched to each other

Design of anti overflow CPC saturator

Comprehensive self inspection to achieve the highest reliability

Durable and reliable, butanol safety features (waterproof, deodorizing)

Used in conjunction with software, fully automated; Automatic self check after startup to ensure high reliability

Analog input of meteorological sensors

DMA can be divided into L-DMA, M-DMA, and S-DMA according to different particle size ranges.

Basic aerosol research

Inhalation and exposure studies

Research on NP Growth, Condensation, and Migration

Filter detection

Research on Mobile Aerosols

Workplace monitoring

GRIIM is a universal software for nanoparticle detection instruments that can record measurement data and a range of complete instrument parameters. The results are displayed in chart form and can be output in a universal file format. The software uses CPC as a counter and Differential Mobility Analyzer (DMA) as an aerosol generator for particle size classification. Real time data processing, algorithm developed by Professor Reischl (University of Vienna), in compliance with the new standard ISO 15900 for calculating particle size distribution. The software displays particle number concentration, surface area, particle size mass distribution, and other statistical parameters.

In Fresno, central California in August and September 2005, GRIMM instruments were compared with other brands of SMPS systems for measuring environmental aerosols. The results show that the particle number concentration distribution measured by GRIMM SMPS+C is reliable compared to the average values measured by other brands. 【Comparison of four scanning mobility particle sizers at the Fresno Supersite (Chow 2006)】

Particle size range: 5-350 nm (M-DMA); 10 ~ 1094 nm (L-DMA)

Particle size resolution: standard 44 channels, can be optimized to 255 channels, logarithmic interval

gas flow rate

Sample gas: 0.3LPM; Sheath gas: 3.0LPM

Flow rate control: The flow rate is controlled by the pressure difference of the nozzle sensor, which is insensitive to environmental vibrations

Carrier gas: air and inert gas

Fluid system

Working fluid: 1-butanol, ultra pure

Liquid removal: Micro pump continuously extracts into the waste liquid bottle

information exchange

RS-232: 9-hole D-shaped connector, ASCII command memory card: PCMCIA SRAM 4MB (only available on mobile systems)

Analog input: can be connected to 3 analog signals from meteorological or gas sensors operating conditions

Environmental temperature: 10~40 ° C

Relative humidity of the environment: 0~95%, no condensation

Environmental pressure: 600~1100 mbar

Power supply: 85-264VAC/47-440Hz, or 120-370VDC

DMA— Vienna Type

External electrode inner diameter: 40 mm; Internal electrode inner diameter: 26 mm

High voltage output module: 5~10000 V, anode internal electrode (cathode optional)

High voltage input module: 0~10 V, provided by CPC or DMA controller

High voltage safety guarantee: Open DMA and automatically turn off high voltage sensor (internal)

Temperature, pressure, and pressure difference sensors for two nozzles