CO2 sensor for Carbon-X - MBS-K30 The ability to read up to 30,000 ppm CO2 is critical to the proper operation and safety of an emergency CO2 system like the Carbon-X. The MBS-K30 is Trolmaster’s newest CO2 sensor, which incorporates a NDIR 0-30,000 ppm sensor in a self-aspirated... $367.00