CARBON MONOXIDE gas Detector (CO) 0-300 ppm and NITROGEN DIOXIDE gas Detector (NO2) 0-30 ppm - RS485 serial output - Electrochemical cell - Dust Proof Enclosure SMART P-2 for Car Parks. Designed to fulfil the new European Standard for gas detection in car parks, the SMART P-2 gas detectors offer the simultaneous detection of CO and NO2 or Petrol vapours integrated in the same detector. The SMART P-2 provide a serial RS485. To meet with the standard in full, these detectors are to be connected to MULTISCAN++PARK gas control panels.