... Service Life≥100,000 TimesAlarm WayClose ValveAlarm Volume50m³/2 m³Static Working Current≤20μAWorking Temperature-10 ... Years ModelFQ-SL---steel shell, LCD display, left entrance, G1.6/2.5/4.0FQ-SR---steel shell, ... LCD display, right entrance, G1.6/2.5/4.0FQ-SB---steel shell, LCD display, left/right entrance ... , gas leaking alarming port, G1.6/2.5/4.0 Our ...