施耐德雙電源WATSGA-100/4P            WATSGB-100/4P                                  WATSNB-63A/4P施耐德雙電源WATSGA-125/4P            WATSGB-125/4P                                  WATSNB-80A/4P施耐德雙電源WATSGA-160/4P            WATSGB-160/4P                                  WATSNB-100A/4P施耐德雙電源WATSGA-200/4P            WATSGB-200/4P                                  WATSNB-160A/4P施耐德雙電源WATSGA-250/4P            WATSGB-250/4P                                  WATSNB-250A/4P施耐德雙電源WATSGA-320/4P            WATSGB-320/4P                                  WATSNB-400A/4P施耐德雙電源WATSGA-400/4P            WATSGB-400/4P                                  WATSNB-630A/4P施耐德雙電源WATSGA-500/4P            WATSGB-500/4P                                  WATSNB-800A/4P施耐德雙電源WATSGA-630/4P            WATSGB-630/4P                                  WATSNB-1000A/4P


GE-28消防系統低壓壓力開關感受到的是管道系統內來自高位水箱的水位的靜壓。消防水箱先啟用，水位下降，低壓壓力開關感受的靜壓降低，轉換成電信號，啟動消防主泵。低壓壓力開關的初始值（也即調試時，壓力開關的壓力傳感器自動感應到的），就是壓力開關的標高和高位水箱高水位標高的高差。消火栓系統的壓力開關是新事物，按規范設在消防水泵的出水干管上。分兩種情況：如果高位消防水箱夠高，不需要穩壓泵，此時壓力開關設定應該是消防水箱的低位報警水位對壓力開關的靜壓值。