welas® digital 3000 HP

With automatic regulation of sampling volume flow by the aerosol sensors welas® under overpressure up to 10 bar or in temperatures to 120 °C

Depending on the aerosol composition to be measured, i.e., the carrier gas component and the particle material, pressure and temperature changes in the carrier gas can significantly influence the particle size distribution, e.g., due to condensation or evaporation.

For this reason, the aerosol sensors welas® 2070 HP, 2100 HP, 2200 HP, 2300 HP, and welas® 2500 HP are equipped with a cuvette heatable up to 120 °C and pressure-tight up to 10 barg to ensure isobaric and isothermal sampling into the sensor's measurement volume.

The welas® digital system is usually calibrated for the operating volume flow. As the operating volume flow changes with pressure and temperature, it is advantageous for the user if automatic volume flow regulation for the sampling volume flow is provided for in the device.

In the welas® digital 3000 HP, the pressure and temperature of the carrier gas are measured, and the required operating volume flow is automatically set to 5 l/min.


  • Mass flow controller for volume flow regulation
  • Heating regulator up to 120 °C
  • Temperature sensor
  • Absolute pressure capsule
  • Filter unit to protect the flow rate control
Operation principle

Your special advantages

  • Measuring range of 0.2 to 100 µm (4 measuring ranges selectable in one device)
  • Up to four measuring ranges in only one device:
    • 0,2 µm – 10 µm
    • 0,3 µm – 17 µm
    • 0,6 µm – 40 µm
    • 2 µm – 100 µm (additionally for sensors 2300 and 2500)
  • Up to 128 size channels per measuring range
  • Concentration range of 1 particle/cm3 up to 106 particles/cm3
  • Calibration curves for different refractive indices
  • Very high and reproducible counting efficiency rate starting at 0.2 µm (see Graph 2)
  • High temporal resolution down to 10 ms
  • Optical fiber technology
  • Measurement in potentially explosive environment
  • Long service life of the light source of 2000 h
  • Extensive PDControl
  • Simple operation
  • Calibration, cleaning and lamp replacement can all be performed independently by the customer
  • Low maintenance
  • Reliable function
  • Reduces your operating expenses

Individual solutions for various industries

  • Separation efficiency determination of automotive cabin air filters, engine air filters, ambient air filters, compressed air filters, vacuum cleaner filters, cleanable filters, electrostatic precipitators, 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 industries
  • Investigation of fast, transient processes
  • Test of smoke detectors
  • Particle measurement for cloud formation
  • Emission measurements
  • Breathing function: inhalate / exhalate (particle size and number)
Do you have any further questions?
Please do not hesitate to contact us.
Technical features

In detail

Measuring principle
Optical light-scattering
Measurement range (number C_N)
< 1 • 106 Partikel/cm3
Measurement range (size)
0.2 – 10 µm, 0.3 – 17 µm, 0.6 – 40 µm, 2 – 100 µm
Volume flow
5 l/min
Size channels
Max. 64/decade
Time resolution
≥ 10 ms
User interface
Thermodynamic conditions
≤ 120°C, ≤ 10 bar
Data acquisition
Digital, 20 MHz processor, 256 raw data channels
Light source
Xenon arc lamp 35 W
Table housing, optional: with mounting brackets for rack-mounting
Power supply
115 – 230 V, 50/60 Hz
Installation conditions
+5 – +40 °C (control unit)
185 • 450 • 315 mm (H • W • D) (19")
Control unit: approx. 18 kg, sensor: approx. 2.8 kg

More information about welas® digital 3000 HP

Brief Description

Brief product description in two-pages as PDF

Product Description

Detailed product description as PDF

Shopping cart

Your individual configuration


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(Art-No: 713keine) - Optional instruction at Palas


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Total price (net)

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