THE DETECT DEVICE WILL CHECK THE SYSTEM AFTER TURN ON THE POWER AND IF THE INTERNAL SYSTEM COMPLETE NORMALLY, IT WILL OPEN THE VALVE AND IGNITE THE PILOT BURNER CORRESPOND WITH THE REQUIREMENTS OF EN298. 2-FAULT SAFETY INSPECTION DEVICE TIME-SETTED PROTECTIVE DEVICE STOPS GAS SUPPLY WHEN HAPPENING OF ABNORMAL FIRE EXTINCTION FLAME SENSOR FOR AUTO-RESTART GAS STOPS AUTOMATICALLY WHEN POWER RUNS OUT SPECIAL FLAME SENSOR AND OXYGEN DEPLETION INDICATOR FREE FROM HEAVY HUMIDITY,MOISTURE,DUST & OIL.