SMC磁性开关底座D-P50DW

施耐德双电源WATSGA-100/4P            WATSGB-100/4P                                  WATSNB-63A/4P施耐德双电源WATSGA-125/4P            WATSGB-125/4P                                  WATSNB-80A/4P施耐德双电源WATSGA-160/4P            WATSGB-160/4P                                  WATSNB-100A/4P施耐德双电源WATSGA-200/4P            WATSGB-200/4P                                  WATSNB-160A/4P施耐德双电源WATSGA-250/4P            WATSGB-250/4P                                  WATSNB-250A/4P施耐德双电源WATSGA-320/4P            WATSGB-320/4P                                  WATSNB-400A/4P施耐德双电源WATSGA-400/4P            WATSGB-400/4P                                  WATSNB-630A/4P施耐德双电源WATSGA-500/4P            WATSGB-500/4P                                  WATSNB-800A/4P施耐德双电源WATSGA-630/4P            WATSGB-630/4P                                  WATSNB-1000A/4P


COD是利用化学氧化剂（如高锰酸钾）将水中可氧化物质（如有机物、亚盐、亚铁盐、硫化物等）氧化分解,然后根据残留氮化剂的量计算出氧的消耗量,是表示水质污染度的重要指标。其值越小,说明水质污染程度越轻。COD量浓度的超标为各种细菌的滋生提供了温床,从而产生了生物粘泥。随着生物粘泥的增多导致了冷却水管线的堵塞,生物粘泥在高温下硬结,而生物粘泥用来溶解是很困难的,这与维修现场用疏通冷却系统困难的现象相吻合。