The success of the Palas® aerosol spectrometers is based on the development of the measurement method with a white light source, 90° scattered-light detections and an optically defined measurement volume by the University of Karlsruhe, KIT.

To the very day it is the world's only optical measurement method that ensures precise particle and concentration determination over a wide measuring range up to 106 particles/cm3 .

2008 the development led to the welas® digital system (White Light Aerosol spectrometer System) with patented T-aperture technology. The patented optical fibre technology allows reliable quasi-simultaneous measurement at two measurement points with one device and in chemically aggressive waste gases.

Palas® offers with the model groups welas® digital, Inas®, Promo® and Fidas® the most modern, reliable and scientifically most thoroughly investigated optical aerosol spectrometers in the world.

Optical aerosol spectrometers (OAS, ISO 21501-1, VDI 3867-4) and optical particle counters (OPC, ISO 21501-4) show different characteristics. Read more about the substantial difference.

Differences between the aerosol spectrometers

Measurement device:
welas®digital
Promo®
Inas®
Possible applications
for very precise particle size and concentration analyses with a high time resolution
for process measurement technology and monitoring applications with continuous measurement
for the measurement of particle size distributions with a high time resolution, e.g. MDI, DPI and pharmaceutical nebulizers
Time resolution
10 ms
1 s
10 ms
Handling
Installed measurement software and analyze software on laptop / PC
for easy handling via internal touchscreen PC
Installed measurement software and analyze software on laptop / PC
Software / Firmware
PDControl software with many setting and display features, e.g. refractive index
intuitive Promo®firmware for user-friendly operation
PDControl software with many setting and display features, e.g. refractive index
Specials
for automatic filter testing with Palas®test rigs and the FTControl software
for integration into process control units
external control, e.g. via modbus
simulation of the throat within inhalation aerosols with dilution ratio 1:10