SPXCDXSRXSS Sensepoint SPXCDXSRXSS XCD Flammable IR 0-100% LEL Methane CH4 Sensor Replacement Cartridge. Honeywell Sensepoint SPXCDXSRXSS XCD Flammable IR 0-100% LEL Methane CH4 Sensor Replacement Cartridge Suitable for use in the Honeywell Analytics Sensepoint XCD Fixed Systems Gas Monitors.