CO2 Gas sensor 0..100 000 ppm

The CO2 Gas sensor is used to monitor gaseous carbon dioxide levels in the range of 0 to 100 000 ppm. The sensor uses the Non-Dispersive Infrared Detection (NDIR) dual wavelength method. CO2 gas moves in and out of the sensor tube by diffusion through the vent holes in the sensor tube. The tube contains an infrared source at one end of the sensor tube and a dual wavelength infrared detector at the other end. The detector measures infrared radiation absorbed in a narrow band centered at 4.26 µm (the wavelength where CO2 gas absorbs most infrared light) and at a second wavelength where no absorption of infrared light by CO2 gas occurs. This second wavelength is used to compensate for fluctuations in temperature and other external influences. This greatly enhances the stability and accuracy of the sensor. When the sensor is collecting data, the intensity of the IR source is modulated – it takes a reading about every 3 s.
The sensor is delivered with a 250 ml sampling bottle and rubber stopper to attach the gas-sampling bottle to the sensor tube. Do not place the sensor tube directly into any liquid. The sensor is intended only for measuring gaseous, not aqueous, CO2 concentrations.

Examples of experiments
• Measuring CO2 levels of exhaled human breath (about 50 000 ppm).
• Measuring CO2 levels (respiration) from animals and insects.
• Monitoring production of CO2 during chemical reactions, e.g. Na2CO3+HCL ?CO2 +H2O+NaCl.
• Monitoring production of CO2 during fermentation or respiration of sugars.

The CO2 Gas sensor can be directly connected to analog BT inputs of the CMA interfaces.
Attention: The sensor cable BT - IEEE1394 needed to connect the sensor to an interface is not supplied with the sensor and has to be purchased separately (CMA Art. Nr BTsc_1).

Technical specifications of the sensor are described in its User's guide.