... sensor MCU processing Malfunction auto-check indicator Detect natural gas, LPG CO&Gas Leakage Detector with LCD Display (Independent) Features: ... processing 3. Malfunction auto-check indicator 4. Detect natural gas, LPG 5. SMT manufacturer technology, good stability 6. ... solenoid value/exhaust fan 7. Digital LED display shows gas concentration 8. Execute criterion: GB15322,EN50194,UL1484 Technical ...