Mini Wide Range Aerosol Spectrometer, Mini-WRAS 1371

The highly compact and portable Mini-WRAS, Model 1.371
A symbiosis of an optical particle counter and electrical mobility spectrometer
Measuring from 0.01 to 35 µm and wireless operation

For many years GRIMM has been manufacturing different versions of aerosol spectrometers, which are used frequently in the field. More often than before the question is: Can the smallest particles be detected with these instruments? For the first time, this is now possible.

Two technologies were combined within the new Mini-WRAS (Mini Wide Range Aerosol Spectrometer): (a) the optical aerosol spectrometer and (b) a stepping mode operated electrode with faraday cup electrometer. Thus, the scattering light diameter of 0.20 to 35 micrometers and the diameter of the electrical mobility from 10 to 200 nanometers can be combined in a wide size range. 41 size channels are being measured every minute, ranging from 0.01 up to 35 micrometers and are released continuously.

With a total weight of only 7.6 kg, an integrated battery and advanced data communication interfaces (Bluetooth, USB, Ethernet and RS-232), this aerosol monitor is unique in the world.

Customer‘s benefits

• Release of measurement data every minute as particle number in 41 size channels
• Portable, compact and with integrated rechargeable battery and air drying
• Distribution of count and mass or output according to occupational health standards EN 481 (inhalable, thoracic, alveolic) can be indicated via Bluetooth and user-friendly software
• Readout of PM10, PM2.5, and PM1 values is also possible with the software
• Does not need any butanol
• Does not need a radioactive source
• For the user, the Mini-WRAS 1.371 offers the complete possibilities when saving or retrieving the measurement data. The data can be conveniently accessed and checked online via Bluetooth or RS-232 at the workplace per laptop or tablet. Additionally, the measurement data is stored on an USB flash drive.

Data interfaces of the Mini-WRAS 1.371: USB, Bluetooth, RS-232

Size channels: 41 channels, wide range from 10 nm to 35 μm 10 channels from electrical sensor, 31 channels from aerosol spectrometer: 10/ 14/ 19/ 27/ 37/ 52/ 72/ 100/ 139/ 193/ 253/ 298/ 352/ 414/ 488/ 576/ 679/ 800/ 943/ 1112/ 1310/ 1545/ 1821/ 2146/ 2530/ 2982/ 3515/ 4144/ 4885/ 5758/ 6787/ 8001/ 9431/ 11120/ 13100/ 15450/ 18210/ 21460/ 25300/ 29820/ 35150 [nm]
Count range: 1 to 3,000,000 particles/liter (aerosol spectrometer)
3,000 – 1,000,000 particles/cm³ (electrical sensor)
Particle mass: From 0.0001 mg/m³ to 100 mg/m³
Occupational classification (IAQ's): Inhalable, thoracic and alveolic in accordance to EN 481 continuously and simultaneously
Environmental data: PM10 and PM2.5, and PM1, PM0.5, PM0.1, continuously and simultaneously
 
Reproducibility: ± 3 % over the total measuring range
Sample flow: 1.2 l/min ± 5 % automatically regulated
Rinsing flow: 0.3 l/min, self-controlled, automatically optical cleaning on start-up and in stand-by mode
Laser wavelength: 660 nm (aerosol spectrometer)
Self-test: Automatically after each start-up
Measurement intervals: 1 minute (10 x 6 s)
Storage intervals: 1 minute
Data storage: USB flash memory
Communication: Fully remotely controlled via Bluetooth (and RS-232)
Data output:  ASCII format and Excel (via software)
Power supply: Li-Ion battery 14.4 V/4.8 Ah for continuous operation up to 8 hours; with internal charger
Power adapter: 18 VDC, maximum current 2.5 A
Dimensions: 34 x 31 x 12 cm (13.4 x 12.2 x 4.7 inches)
Weight and color: 8.2 kg (18.1 lb), grey housing
Operating conditions: +4 to +40 °Celsius (39 to 104 °F), RH < 95 % (non-condensing),
non-corrosive or explosive gases
Storage and transport: -20 to +50 °Celsius (-4 to 122 °F), RH < 95 % (non-condensing)
Pressure range: Absolute: 1013 hPa +/- 120 hPa, equates up to ca. 1,000 m ASL
Field service: Integrated sample pipe and corona cleaning