AL-4021 Formaldehyde (HCHO) in Air and Water Monitor
The Model AL-4021 is a state-of-the-art digital formaldehyde (HCHO) analyzer that is available in several different application-specific configurations. Models are available for air or water HCHO measurement applications.
Provides absolute concentrations for HCHO (formaldehyde)
Simple to use, fully automatic operation
Automated calibration using internal HCHO permeation source or liquid HCHO standards
Liquid phase ranges: 0 to 30.0 m
Gas phase ranges: 0 to 20.0 ppbV
HCHO gas phase detection limit of < 50 ppt
HCHO liquid phase detection limit of < 100 ng/l
RS232 serial interface and PC user software
Plastics Production and Quality Control
Environmental Quality Control
Principle of Operation
The detection of formaldehyde is based on the so-called "Hantzsch"-reaction. The technique is sensitive to formaldehyde in aqueous solutions. Therefore, for the measurement of gaseous formaldehyde, these have to be trapped in aqueous solution first. This is achieved in a stripping coil by pumping air and a stripping solution (pH-buffered water free of HCHO) continuously, at known flow rates. The air and liquid streams are afterwards separated in a glass separator and the solution is then analyzed for formaldehyde.
The Model AL4021 is capable of measuring HCHO in air and water samples, the HCHO mixing ratio in air is then calculated from the concentration in solution and the ratio of air and stripping solution flow rates.
Formaldehydes in water solutions can be measured directly. In this mode, stripping is not necessary and, consequently, either zero air has to be applied to the sample inlet or the internal zero trap must be switched on.
Due to time responses those applications requiring two channels (such as input vs. output process checks) or simultaneous air and water measurements use two analyzers ganged together. The fully automated nature of the system allows the system to be tailored to many on line process applications and configurations.
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Turners Falls, MA 01376 USA
Fax: (413) 863-0255
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This page was last updated on Monday, September 11, 2006 .