Front view of an AL2021 hydrogen peroxide analyzer. The supply with reagents, liquid calibration standard and liquid sample is realized by 1/16'' tubing in the front of the instrument.

Automated H2O2 analyzer for very low concentrations 

The hydrogen peroxide (H2O2) monitor AL2021 has an extraordinary high sensitivity and a unique low detection limit of <100ppt (parts per trillion) for gaseous samples and <100 ng/liter (eq. 3×10-9 molar) for liquid samples, respectively. The complete chemical processing, including gas stripping, is integrated into the instrument. The measurement process is fully automated, all necessary reagents are provided by a digitally controlled high precision peristaltic pump. The standard dual-channel instrument AL2021 provides absolute concentrations for H2O2 and relative concentrations for all other peroxides. There is a special single-channel version (AL2021SC) for decontamination control and drinking water quality monitoring.

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Front view of a AL4021 formaldehyde analyzer. The 1/16'' inlet in the front is used for calibration and liquid measurements.

Automated HCHO analyzer for very low concentrations

The AL4021 is a completely automated and continuously working formaldehyde (HCHO) analyzer for gaseous and liquid samples based on the Hantzsch reaction, which is sensitive to very low concentrations of HCHO (<ppbV for gaseous samples and <µg/L for liquid samples). All functions of the AL4021 are controlled via a 7" touch screen on the front panel. The AL4021 is easy to use, reliable and has a low need for maintenance. It has an built-in HCHO source for automatic calibration (optional). The AL4021 provides exact and reliable results in free programmable concentration ranges. The AL4021 can store data continuosly on an USB stick.

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Front view of a AL5002 ultra-fast CO-monitor. The instruments is operated by a touch-screen in the front panel or remotely via RS232.

General description

The AL5002 is an ultra fast carbon monoxide (CO) monitor with an unique sensitivity below 1ppb (parts per billion). The AL5002 is specially designed for the application in air-planes, where a high time reolution results in a high spatial resolution. The detection of CO is based on a VUV-fluorimetry, employing the excitation of CO at 150nm. This method combines a high sensitivity with high selectivity and is linear from 1ppb to 100 ppm. The AL5002 is widely used in remote research stations like in Antarctica, on research ships and air-crafts, where very low detection limits, high sensitivity, fast response, high temperature stability, low zero drift and a huge linearity range is required. The excitation light is generated by a cw-CO2 resonance lamp, which needs only a low maintenance. A monochromator unit, using dielectric mirrors, filters out the VUV from the lamp's spectrum. The fluorescence light in the wavelength range between 160 nm and 190 nm is detected by a VUV sensitive photomultiplier followed by a fast counter. The basic principle is described in detail by Gerbig et al..

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