Description
ESD也不单是实现联锁关系，它应该凌驾于生产过程控制之上，具有独立性，这样降低了两者同时失效的概率，ESD的安全等级要高于DCS。DCS主要是：动态控制，故障自动显示，维修时间不太关键，可以进行自动/手动切换；ESD主要是：静态监测、保护，必须测试潜在故障，维修时间非常关键，必须始终在线，不允许离线。
Oerlikon Leybold TMP 1100C Turbo Vacuum Pump Rebuilt
1 Year Warranty; Leybold Factory Rebuild
One-day shipping available
Vacuum pump, single stage liquid ring
Single Stage Liquid Ring
Enlarge
Kinney KT300 Rotary Piston Vacuum Pump
Edwards iQDP80 Dry Semiconductor Vacuum Pump iQMB 1200
Body for Nash 1251 liquid ring compressor, SS
LEYBOLD TURBO PUMP 1000C PN A971300407 – REFURBISHED
