《仪表专业英语》PPT课件.ppt

Installation requirements,安装要求,LOGO,Contents,WORDS OF INSTRUMENTS,仪表盘布置图 instrument arrangement on panel 模拟盘尺寸图 flow plan for graphic panel 仪表供电及接地系统图 instrument power supply & grounding diagram 联锁系统图 interlock block diagram 仪表回路图 instrument loop diagram 仪表导压管连接图 instrument pressure piping hook-up 仪表蒸汽伴热管连接图 instrument steam tracing hook-up 分析仪器管连接图 analyzer piping hook-up 控制室内仪表盘布置图layout of instrument panel in control room 控制室内管线布置图layout of instrument wiring & piping in control room 仪表主电缆桥架布置图layout of instrument main cable duct 仪表主电缆布置图layout of instrument main cable 仪表接线图layout of instrument wiring 仪表空气配管图（信号）layout of instrument air piping-supply air 仪表空气配管图（供气）layout of instrument air piping-supply air 仪表公用工程管线布置图layout of utility piping for instrument 仪表接地布置图 grounding layout for instrument 现场仪表布置图plot plan of field instrument 仪表配管、配线区域划分图key plan for instrument layout drawing 仪表安装图 typical drawing for instrument fabrication 预制件制作图typical drawing for instrument fabrication 仪表管线连接端子表instrument wiring & tubing connection list 控制室内管线连接端子表instrument wiring & tubing connection list in control room 仪表施工材料表material list for instrument,WORDS OF VORTEXMERERS,Swirl 漩涡 compliant 服从的，顺从的 recommended 被推荐的 Sections 区域 indicate 指出，表明 sensor 传感器 Interval 间距 avoidance 避免 vibration 震动 Diameter 直径 radius 半径 identical 同一的，完全的 Attenuation 变薄，衰减，稀释。 Alternating 交替的，相互的 Pulsating 颤动 fitting gate 填充门 piston 活塞 Plunger 活塞 compressor 压缩机，压缩物 conveying 输送，传输 Damping 阻尼，衰减，减幅 residual 剩余的 downstream 下游 frequency of the flow meter 流量计的频率 medium 中游 upstream 上游 hydraulic 水力的，液压的 vessel 容器 cavitations 气穴现象 ambient 环境 take into account 考虑，重视 downward 向下的，下降的 upward 向上的，上升的,examples,1:A vortex or swirl flow meter can be installed at any point in the pipeline system. However the following installation conditions must be considered. 2:Compliant ambient conditions 适应环境的要求。 3:Compliance with the recommended inflow/out flow sections. 4:The flow direction must correspond to that indicate by the arrow(箭头标记)on the flow meter sensor. 5:Compliance with the required minimum interval for removing the transmitter and replacing the sensor. 6: avoidance of mechanical vibrations of the pipeline.,examples,7: the internal diameter of the flow meter sensor and the pipe must be identical. 8: avoidance of pressure vibrations at zero flow by fitting gates at intervals in long pipeline system. 9:attenuation of altering (pulsating 颤动)flow during piston pump or compressor conveying by using appropriate damping devices. the residual pulse must not exceed 10%.the frequency of the conveying equipment must not be within the range of the measuring frequency of the flow meter. 10:valves /gates should normally be arranged in the flow direction downstream of the flow meter. If the medium is conveyed through piston/plunger pumps or compressors (pressure for fluids10bar(145psi)it maybe subject to hydraulic vibration in the pipeline when the valve is closed. if this does occur, the valve absolutely has to be installed in the flow direction upstream of the flow meter. Suitable damping devices (e.g. .air vessels )might need to be fitted.,EXAMPLES,11:when fluids are measured the sensor must always be filled with media and must not run dry. 12:when fluids are measured and during damping there must be no evidence of cavitation. 13:the relationship between the temperate of the media and the ambient temperature has to be taken into account. 14:at high media temperatures150C the flow meter sensor must be installed so that the electronics are pointing to the side or downward.,19.2 仪表控制,模拟信号analog signal 数字信号digital signal 反馈控制feedback control 前馈控制feed forward control 串级控制cascade control 超驰控制override control 分配控制batch control 顺序控制sequence control 比例控制proportional control action 积分控制integral control 微分控制derivative control action 两位式作用on-off control action 正作用direct action 反作用r