Promo® 2000 P

With automatic regulation of the sampling flow through the welas® aerosol sensors at an overpressure up to 10 bar


Promo® 2000 P

With automatic regulation of the sampling flow through the welas® aerosol sensors at an overpressure up to 10 bar


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

For this reason, the welas ® aerosol sensors welas ® 2070 P, 2100 P, 2200 P, 2300 P and welas ® 2500 P are equipped with a pressure-tight cuvette to ensure isobaric and isothermal sampling into the sensor's measurement volume.

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

In the Promo® 2000 P the pressure of the carrier gas is measured and the required operating volume flow is automatically set to 5 l/min.

  • Mass flow controller for volume flow regulation
  • Absolute pressure capsule
  • Filter unit


  • Measuring range of 0.2 to 100 µm (up to 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 to 106 particles/cm3
  • Calibration curves for different refractive indices
  • Very high and reproducible counting efficiency rate starting at 0.2 µm
  • Pressure-resistant up to 10 bar (optional)
  • Optical fibre technology
  • Simple operation with a large touch display
  • Calibration, cleaning and lamp replacement can all be performed independently by the customer
  • External control by RS 232 or Ethernet
  • With analysis software PDAnalyze
  • Optional: Software PDControl for operation as welas® digital available
  • Low maintenance
  • Reliable function
  • Reduces your operating expenses


Measuring principle Optical light-scattering
Measurement range (number CN) < 1 • 106 particles/cm3
Measurement range (size) 0.2 – 10 µm, 0.3 – 17 µm, 0.6 – 40 µm, 2 – 100 µm
Size channels Max. 128 (64/decade)
Volume flow 5 l/min regulated by mass flow
Data acquisition Digital, 20 MHz processor, 256 raw data channels
Light source Xenon arc lamp 35 W
Power consumption 100 W
User interface Touchscreen, 800 • 480 pixel, 7" (17.78 cm)
Housing Table housing, optional: with mounting brackets for rack-mounting
Support options Direct remote access, Palas® webserver service
Weight Control unit: approx. 8 kg, sensor: approx. 2.8 kg
Operating system Windows embedded
Data logger storage 4 GB Compact Flash
Software PDControl, FTControl, PDAnalyze
Installation conditions +5 – +40 °C (control unit)
Interfaces USB, Ethernet (LAN), RS232/485, Wi-Fi
Dimensions 185 • 450 • 315 mm (H • W • D) (19")


  • Emission monitoring of installations
  • Control of grinding and classification processes
  • Monitoring of production processes in the food, pharmaceuticals and chemicals industries
  • Testing of complete filters, inertial and wet separators or electrostatic precipitators


Brief Description
Brief product description in two-pages as PDF
Product Description
Detailed product description as PDF


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