welas® digital 1000 — Aerosol Spectrometer

welas® digital 1000 | Light-scattering spectrometer system

Description welas digital 1000

The new welas® digital 1000 is a powerful and economical light-scattering spectrometer system, which determines the particle concentration and the particle size extremely precisely and reliably. The combination of a particularly powerful Xenon high pressure lamp with very high light intensity and the sensing photomultiplier being directly integrated into the aerosol sensor allows particles as small as 120 nm to be measured.

welas® digital 1000 has an especially high resolution and classification accuracy and is therefore often used as a reference device for other measurement procedures.

The welas® digital 1000 is based on scattered light analysis from individual particles. Fast digital signal processing is now combined in the new instrument with the particular advantages of the well-known and internationally proven welas® system. This allows improved coincidence detection for each particle passing through the measurement volume.

The best classification accuracy and the best size resolution of aerosol particle sizes are guaranteed by the following characteristics

  • White light and 90° scattered light detection: Clear calibration curve
  • Patented T-aperture: No border zone error
  • New digital individual signal processing: Coincidence detection and correction of individual signals making it possible to measure up to a factor of 5 above the previous max. concentration limit of each sensor.

Optionally, the sensors are also available for measurements in overpressure (up to 10 bar) and at high temperatures (up to 250°C or higher).

Technical parameters

  • Measurement range: 120 nm – 40 µm
    • Cn ≤ 5 x 105 Particles/cm3
  • Environmental conditions:
    • +10°C≤ T ≤ +40°C
    • Optional: T ≤ 250°C, p ≤ 10 bar
  • Suction volume flow: 5 l/min and 1.6 l/min
  • Digital individual signal acquisition: 20 MHz prozessor, 256 raw data channels
  • Light source: 75W Xenon lamp
  • Interface: USB
  • Power supply: 115/230V ; 50/60Hz
  • Case: Desktop case (19“ compatible, 3 HE, 84 TE, T = 315 mm), optional with mounting brackets for rack installation

Application examples

  • Determination of separation efficiency of car interior filters, engine air filters, room air filters, compressed air filters, vacuum cleaner filters, cleanable filters, electrostatic precipitators, oil separators, cooling lubricant separators, wet scrubbers, cyclones and other separators
  • Isothermal and isobaric particle size and number determination, for instance in the automobile, chemical, pharmaceutical and foodstuffs industries
  • Analysis of fast, transient processes
  • Inspection of smoke detectors
  • Particle measurement for cloud formation
  • Emission measurements

Particular advantages of the welas system

  • Largest measurement range from 120 nm to 40 µm (4 selectable measurement ranges )
  • Calibration curves for various refraction indices
  • Largest concentration range from 1 Particle/cm3 to 5 x 105 Particles/cm3
  • Very high and reproducible counting efficiency from min. of 0.12 µm
  • High sampling rate (temporal resolution of up to 10 milliseconds)
  • Comprehensive software (PDControl and FTControl)
  • Strong, powerful external sampling suction pump ASP 1000
  • Reduced operating expenses
  • Calibration, cleaning and lamp exchange can all be performed independently by the user
  • User-friendly operation
  • Low maintenance
  • Reliable operation

Please contact us for more detailed information.