Description
因此,衡量系统网络性能的指标并不是网络的速率,即通常所说的每秒比特数(bps),而是系统网络的实时性,即能在多长的时间内确保所需信息的传输完成。系统网络还必须非常可靠,无论在任何情况下,网络通信都不能中断,因此多数厂家的DCS均采用双总线、环形或双重星形的网络拓扑结构。
Leybold D25B Rotary Vane Vacuum Pump 20.9 CFM
Leybold WS151 Roots Blower Vacuum Pump 108.0 CFM
Pfeiffer TPU500 Turbomolecular Vacuum Pump 500.0 LPS
Varian TV70 Turbomolecular Vacuum Pump 68.0 LPS
CVC PVM-32B used
VERY NICE CIT-ALCATEL VACUUM UNIT MODEL 2033, RSV 300B
Leybold Heraeus 40 BCS Fomblin Prepped Roughing Pump
OSAKA COMPOUND MOLECULAR TURBO VACUUM PUMP & CONTROL
