(MBS-K30) CO2 Sensor for Carbon-XOverview 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 Trolmasters newest CO2 sensor, which incorporates an NDIR 0 30,000 ppm sensor in a self aspirated enclosure. TrolMaster's MBS K30 also features a built in LCD display that will constantly display the current CO2 level (ppm). Each of the zones rooms monitored by the Carbon X can have 1 or 2 MBS