GFS-3000: Control-Unit 3200-C

The Control-Unit 3200-C contains the CO2 and H2O analyzer, as well as all components required for the CO2, H2O and flow control.

The Control Unit 3200-C of the GFS-3000 contains a high accuracy non-dispersive 4-channel infrared gas analyzer for the determination of CO2 (0-3000 ppm) and H2O (0-75000 ppm) with 20 cm optical path length, 6 ml gold plated cells. The specially developed dualfrequency chopper technology allows simultaneous assessment of differential and absolute signal.

The analyzer is optimized for a very stable and accurate differential signal. The differential zero is indicated, allowing clear information about the stability of the measurement.

Due to the separation of analyzer and measuring head, the measuring head temperature does not influence the analyzer.

The integrated CO2 control ranges from 0 to 2000 ppm CO2. The CO2 supply can be filled from cartridges. One cartridge contains 8 g, and provides CO2 (340 ppm, standard flow rate) continuously for more than 48 hours. The actual CO2-reserve is indicated. Alternatively an external CO2-cylinder equipped with pressure reducer (6 bar) can be directly attached to the control unit.

Air flow through the cuvette is exactly adjusted between 300-1400 μmol s-1 by a membrane pump controlled by a high precision electronic mass flow-meter. The mechanical flow indicators directly show flow balance and cuvette tightness.

The humidity control for drying and humidifying ranges from 0 to nearly 100% r.h. It consists of a drying and humidifying column and an automatic valve.