How it works
The Aero-Laser formaldehyde monitor AL4021 is an extremely sensitive chemical analyser, based on the Hantzsch (acetyl- acetone) reaction.
It features the detection of formaldehyde down to lowest concentrations of 100 ppt (parts per trillion) for gaseous samples, and 150 ng/litre (eq. 2×10 molar) for liquid samples, respectively. The -9 complete chemical processing, including gas stripping, is integrated into the instrument. Using a fluorimetric detection method, the instrument achieves an extraordinary selectivity, avoiding interferences of other chemical substances in the sample gas or liquid.
The AL4021 can be calibrated semi-automatically by using liquid formaldehyde standards or automatically, using an optional integrated standard gas generator, based on a permeation tube. Contrary to other highly sensitive formaldehyde monitoring methods, the instrument has a delay time of only a few minutes and a time resolution of 90 seconds.
Originally designed for environmental and climate research, the AL4021 became a major instrument in the field of formaldehyde emission monitoring of products based on wood, plastics or fibres, within the last few years.
