암모니아 가스 모니터 경보 기능

 The Ammonia gas Monitor alarming when the meter measurement value is less than the preset value .The buzzer alarming and the green indicator flickers when the meter measurement value is less than the value preset for the grade 4  alarming-line ; and the buzzer alarms and the red  indicator flickers when the meter measurement value is  less than the value preset for the grade 2 alarming-line.