CARBON MONOXIDE gas Detector (CO) 0-300 ppm. Electrochemical cell and PETROL VAPOURS. Detector 100% LEL Catalytic sensor - RS485 serial output - 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.