welas® Sensors — Aerosol Spectrometry

The welas® sensors for the welas® digital system and Promo®

Descriptionwelas sensors

welas® sensors are available for particle measurement in gases and in liquids.

The welas® sensors are optimised with measuring volumes of different sizes for particular particle concentrations for a coincidence-free measurement. High particle counting rate and therefore a good statistical security over concentration ranges from < 1 particle/cm3 to 106 particles/cm3 are achieved.

The trouble-free and reliable measurement of large particles, up to 105 µm, with these sensors is assured by the vertically orientated aerosol duct, flowing the samples at a high volume flow of 5 l/min and a large aperture area.

Pressure-resistant and heatable aerosol sensors

A reange of special measuring cuvettes make the use of welas® aerosol sensors possible in exceptional measurement conditions. These are available in configurations including:

  • ‘H’ heatable up to 250°C; higher temperatures on request
  • ‘P’ pressure-resistant up to 10 bar overpressure
  • resistant to chemically abrasive media

Technical parameters

Sensors with light-wave conductor technology:

  • Sensors series 2000:
    • Measuring range: 0.2 µm – 105 µm
    • Weight: 2.8 kg
    • Dimensions (WxHxD): 250 x 50 x 100 mm
    • Suction volume flow: 5 l/min
    • (others on request)
  • Sensors series 27300:
    • Measuring range: 0.5 µm – 40 µm
    • Weight: 12 kg
    • Dimensions (WxHxD): 470 x 260 x 150 mm
    • Volume flow: for in-situ measurements in tube up to approx. Ø 100 mm; depending on the tube Ø

Sensors without light-wave conductor technology:

  • Sensors series 1000:
    • Measuring range: 120 nm – 40 µm
    • Light source: Xenon high pressure
    • Power supply: 115V/230V; 50/60 Hz
    • Cooling: Water cooling
    • Weight: 19 kg
    • Dimensions (WxHxD): 530 x 200 x 530 mm
    • Suction volume flow: 5 l/min
    • (others on request)

Application examples

  • Separation efficiency determination of car interior filters, engine air filters, inside air filters, compressed air filters, vacuum cleaner filters, cleanable filters, electric filters, oil separators, cooling lubricant separators, wet separators, cyclones and other separators
  • Isothermal and isobaric particle size and quantity determination, e. g. in the automotive, chemical, pharmaceutical and food industry
  • Analysis of fast transient processes
  • Testing of smoke detectors
  • Particle measurement for clouding processes
  • Emission measurements

Particular advantages

  • The sensors are easily exchangeable
  • Very good conformity of all sensors regarding particle size and particle concentration
  • Sensors for in-situ measurements no long sample lines required
  • Measurement in explosive environments with the welas® digital 2000 (without heating)
  • Fast and simple cleaning
  • Easy handling
  • Reliable function
  • Low maintenance

Please contact us for more detailed information.