GfG Instrumentation 804765 CO2 Absorption Filter for DS400 and DS404 Docking Station

CO₂-free zero gas is required for testing and calibration of the CO₂ sensor zero point. As fresh air contains approximately 500 ppm CO₂ , the disturbing CO₂ can be removed using a CO₂ absorption filter. The CO₂ is thereby absorbed by calcium hydroxide (80 %) / sodium hydroxide (5 %) / H₂O (15 %).

The absorber removes 1000 ppm CO2 from approx. 2,500 l of air. This corresponds to a service life of approx. 5,000 minutes of zero gas pump operation with one docking station. The docking station calculates the service life on the basis of the flow rate and gives a warning to replace the filter when necessary. The filter gradually changes color to pale blue.